Calculators

About these tools

All 250 tools in this section are free, work in your browser on any device, and need no sign-up.

• Percentage calculator: X% of Y, what percent X is of Y, percentage change, and adding or removing a percentage.
• Age calculator: Exact age in years, months and days from a birthday, next birthday, and the Hijri date.
• Date calculator: Days between two dates (with working days), or add and subtract days, months and years.
• Time duration calculator: Time between two clock times, even across midnight, and add up hours for timesheets.
• BMI calculator: Body Mass Index in kg/cm or lb/ft, with the healthy weight range for your height.
• Loan calculator: Monthly payment, total interest and a payoff table. See what extra payments save. Mortgage, car loan.
• Compound interest calculator: How savings and investments grow with interest and monthly contributions.
• Profit margin calculator: Profit, margin and markup from cost and price, or the price you need for a target margin.
• Discount calculator: Sale price and savings, including extra discounts on top and tax.
• VAT calculator: Add VAT to a price or remove it, with common rates (UAE, Saudi Arabia, UK, EU…). Sales tax, GST.
• Salary converter: Convert pay between hourly, daily, weekly, monthly and yearly (before tax).
• Fuel cost calculator: Trip fuel cost in km or miles with L/100km, km/L or MPG. Round trip and cost per person.
• GPA calculator: Grade point average on the 4.0 scale, including cumulative GPA.
• Tip calculator: Tip and total per person, split the bill and round up.
• Scientific calculator: A full scientific calculator: trig in degrees or radians, powers, roots, logs, factorials and history. Type or tap.
• Fraction calculator: Add, subtract, multiply and divide fractions and mixed numbers, with the answer simplified.
• Average calculator: Mean, median, mode, range and sum of any list of numbers.
• Standard deviation calculator: Sample and population standard deviation, variance and standard error of a list of numbers.
• Ratio calculator: Simplify a ratio, see each side's share, and scale it to a new size.
• Proportion calculator: Solve A/B = C/X for the missing number (cross multiplication).
• Percentage difference calculator: The percentage difference between two values, and the percentage change each way.
• Circle calculator: Area, circumference, radius and diameter of a circle from any one of them.
• Triangle calculator: Area, perimeter, angles and type of a triangle from its three sides.
• Area calculator: Area and perimeter of squares, rectangles, triangles, circles, trapezoids, ellipses and more.
• Volume calculator: Volume and surface area of cubes, boxes, cylinders, cones, spheres and pyramids.
• Pythagorean theorem calculator: Find the missing side of a right triangle: a² + b² = c².
• Quadratic equation solver: Solve ax² + bx + c = 0: real or complex roots, discriminant and vertex.
• GCD and LCM calculator: Greatest common divisor and least common multiple of two or more numbers.
• Prime factorization calculator: Check if a number is prime and break it into prime factors.
• Modulo calculator: Find a mod n, the quotient and the remainder, for positive and negative numbers.
• Permutation and combination calculator: nPr and nCr, with and without repetition, exact even for big numbers.
• Probability calculator: Chances of A and B, A or B, neither, and at least once in several tries.
• Significant figures calculator: Round any number to significant figures and count the significant figures in it.
• Slope calculator: Slope, line equation, angle, distance and midpoint from two points.
• Matrix calculator: Determinant, inverse, transpose, and adding or multiplying matrices.
• Exponent and log calculator: Powers, roots and logarithms in any base, plus ln and log₁₀.
• Final grade calculator: What you need on the final exam to get the grade you want.
• Weighted grade calculator: Your grade from assignments with different weights, with the letter grade.
• Test score calculator: Turn points into a percentage and a letter grade.
• Linear equation system solver: Solve 2 or 3 equations with 2 or 3 unknowns, with the steps.
• Logarithm calculator: Log of any base, natural log, and antilog, with the working.
• Root calculator: Square, cube and nth roots, simplified to the form a√b.
• Complex number calculator: Add, multiply, divide and find the modulus, angle and powers of complex numbers.
• Vector calculator: Add, subtract, dot product, cross product, magnitude and angle for 2D and 3D vectors.
• Sample size calculator: How many people to survey for a chosen confidence level and margin of error.
• Z-score and p-value calculator: Z-score, percentile and p-value from a value, mean and standard deviation.
• Confidence interval calculator: Confidence interval for a mean or a proportion at 90, 95 or 99%.
• Linear regression calculator: Best-fit line, slope, intercept and R² from your data points, with a chart.
• Function grapher: Plot one or several functions like sin(x) and x^2 and zoom, with points of interest.
• Unit circle: An interactive unit circle with sine, cosine, tangent and exact values.
• Truth table generator: Build the truth table of any logic expression (AND, OR, NOT, XOR, →).
• Boolean expression simplifier: Simplify a logic function with a Karnaugh map and see the minimal expression.
• Venn diagram maker: Draw a two or three set Venn diagram with your own labels and download it as PNG.
• Derivative calculator: Differentiate any function of x with the product, quotient and chain rules, up to the third derivative, and evaluate it at a point.
• Integral calculator: Find the antiderivative of common functions, and the exact value of a definite integral between two limits.
• Midpoint and distance formula calculator: The distance, midpoint, slope and angle between two points in 2D or 3D.
• Binomial distribution calculator: Probability of exactly, at most or at least k successes in n trials, with the mean and standard deviation.
• Simple interest calculator: Interest and total for a loan or deposit with simple (not compound) interest.
• Savings goal calculator: How much to save each month to reach your goal, with interest.
• Retirement calculator: How much you'll have at retirement and the income it can give you.
• Inflation calculator: What things will cost in the future and what your money will be worth.
• ROI calculator: Return on investment and the yearly (annualised) return.
• Break-even calculator: How many units you must sell to cover your costs.
• Car loan calculator: Monthly car payment with down payment, trade-in, tax and interest.
• Mortgage payoff calculator: How much time and interest extra monthly payments save on your mortgage.
• Debt payoff calculator: Plan to clear several debts with the avalanche or snowball method.
• Net to gross pay calculator: Take-home pay from gross pay, or the gross pay you need for a net amount.
• Overtime pay calculator: Regular pay, overtime pay and total for any overtime rate.
• Commission calculator: Sales commission and total earnings with a base salary.
• Markup price calculator: Selling price, profit and margin from cost and markup.
• Double discount calculator: Final price when several discounts are applied on top of each other.
• Sales tax calculator: Add sales tax to a price or find the price before tax.
• Cash denomination calculator: The fewest notes and coins for any amount, in USD, EUR, GBP, AED, SAR and more.
• Freelance rate calculator: The hourly and day rate to charge to reach your yearly income.
• Subscription cost calculator: What a subscription really costs per day, month, year and five years.
• Unit price calculator: Compare pack sizes and prices to find the best value.
• Zakat calculator: Zakat due on cash, gold, silver, investments and business goods, with the nisab.
• End of service gratuity calculator: Gratuity for the UAE, Saudi Arabia, Qatar and Kuwait from salary and years of service.
• Leave salary calculator: Pay for unused annual leave days from your salary and the leave balance.
• Islamic inheritance calculator (mirath): Divide an estate between the heirs by the shares in Islamic law, with awl and radd shown.
• Cheque amount in words: Write a cheque amount in words in Arabic and English, for AED, SAR, USD, EUR and more.
• Stock average price calculator: Your average buying price after several purchases, and what a new buy does to it.
• Position size calculator: How many shares or lots to buy so a stop loss risks only the percentage you choose.
• Pip value calculator: The value of one pip for a currency pair and lot size, in your account currency.
• Trading profit and loss calculator: Profit, loss, return and fees for a stock, crypto or forex trade, long or short.
• CAGR calculator: Compound annual growth rate between a start and end value over any number of years.
• NPV and IRR calculator: Net present value and internal rate of return for a series of cash flows.
• Depreciation calculator: Yearly depreciation of an asset by straight-line or declining balance, with a schedule.
• Rent vs buy calculator: Compare renting with buying a home over the years, including mortgage, costs and growth.
• Rental yield calculator: Gross and net rental yield of a property from price, rent and costs.
• Mortgage affordability calculator: How much home loan you can afford from your income, debts and deposit.
• Credit card payoff calculator: How long to clear a card and how much interest you pay at different monthly payments.
• Late payment interest calculator: Interest owed on an overdue invoice by days late and rate.
• CPM, CPC and CTR calculator: Ad costs: cost per thousand views, per click, per lead and click-through rate.
• Customer lifetime value calculator: What a customer is worth over time, and how much you can spend to win one.
• Startup runway calculator: How many months of cash you have left from your balance, burn and growth.
• Meeting cost calculator: What a meeting really costs in salaries, live as the clock runs.
• Salary raise calculator: Your new salary after a raise in percent or amount, monthly, yearly and hourly.
• Split the bill calculator: Who owes whom after a shared trip or dinner, with the fewest payments.
• CD (certificate of deposit) calculator: What a CD will be worth at maturity, the interest you earn and the effective yield (APY), with optional tax.
• CD ladder strategy calculator: Spread your savings over CDs of different terms and see the interest and when each one matures.
• Capital gains tax calculator (US): Federal tax on the sale of shares, a home or other assets: short-term vs long-term rates and the 3.8% investment tax.
• Refinance break-even calculator: How many months it takes for a lower mortgage rate to pay back the closing costs, and the lifetime difference.
• HELOC and home equity loan calculator: How much you can borrow against your home, the interest-only and repayment payments, and a fixed-rate comparison.
• Lease vs buy car calculator: Compare the total cost of leasing a car with buying it, after what you could sell it for.
• Car depreciation calculator: How much value a car loses each year, with a year-by-year table and the cost per month and per kilometre.
• Currency exchange hidden fee calculator: See how much a bank's exchange rate and fees really cost you compared with the mid-market rate.
• Bonus tax calculator (US): How much of a bonus you keep after the flat 22% withholding, Social Security, Medicare and state tax.
• Gross-up bonus calculator: How big a gross bonus must be for an employee to receive an exact amount after tax.
• Mileage reimbursement calculator: Reimbursement or tax deduction for business, medical and charity miles at the IRS rates.
• 401(k) early withdrawal penalty calculator: The tax and 10% penalty if you withdraw from a 401(k) or IRA before 59½, and the growth you give up.
• Down payment savings goal calculator: How long it takes to save a house deposit, with interest on your savings and rising home prices.
• Closing costs calculator for home buyers: Estimated lender, title, inspection, tax and other costs on top of your down payment.
• PMI (private mortgage insurance) calculator: The monthly cost of PMI and how long it lasts until you reach 80% loan-to-value.
• Bi-weekly mortgage payment savings calculator: Interest saved and years cut off a mortgage by paying half every two weeks.
• Airbnb rental income calculator: Monthly profit from a short-term rental after fees, cleaning and fixed costs, with the break-even occupancy.
• Cap rate calculator: The capitalisation rate of an investment property from its price, rent, vacancy and costs.
• Gross rent multiplier (GRM) calculator: Compare rental properties with price divided by yearly rent, and the gross yield.
• 1031 exchange tax deferral calculator: The capital gains, depreciation recapture and other taxes you could defer by exchanging an investment property.
• Dividend reinvestment (DRIP) calculator: Project a dividend portfolio with reinvested dividends, monthly additions and growth, year by year.
• FICA Social Security and Medicare tax calculator: Social Security, Medicare and additional Medicare tax on wages, or self-employment tax.
• Traditional IRA vs Roth IRA calculator: Which one ends with more money after tax, from your tax rate now and in retirement.
• W-4 federal tax withholding estimator: Estimate your yearly federal tax and the withholding per paycheck, with credits for children and dependants.
• 529 college savings plan calculator: What a 529 plan could be worth when college starts, against the future cost of tuition.
• Treasury bill (T-bill) yield calculator: The price and the investment yield of a Treasury bill from its discount rate and days to maturity.
• Options profit and loss payoff chart: Draw the profit and loss of calls, puts and stock positions at expiry, with break-even points and spreads.
• Estate and inheritance tax calculator (US federal): Federal estate tax on an estate above the exemption, with deductions and spouse portability.
• Annuity payout and present value calculator: The future value, present value or payment of an annuity, ordinary or due.
• Cash conversion cycle calculator: How many days your cash is tied up in stock and unpaid invoices: DIO + DSO − DPO.
• S-corp reasonable salary tax calculator: Compare self-employment tax with S-corp payroll tax to see how much a salary and distribution split could save.
• Property tax estimator by state: Estimate the yearly property tax on a home from the average rate in each US state.
• Cost of living comparison between cities: How much salary you need in another city to live the same way, for 50 cities including the Gulf, Europe and Asia.
• PayPal fee calculator for sellers: What PayPal takes from a sale and the price to charge for your target profit margin.
• eBay seller fee and profit calculator: Final value fees, promoted listing costs and your profit on an eBay sale.
• Amazon FBA seller fee calculator: Referral, fulfilment and storage fees and your profit per unit sold on Amazon.
• Etsy seller fee and profit margin calculator: Listing, transaction and payment fees on an Etsy sale, and the price for your margin.
• Stripe fee calculator: The fee on a card payment, or the amount to charge so you receive an exact sum.
• Shopify payment and transaction fee calculator: Card processing, gateway and plan fees per order and your profit on a Shopify sale.
• Mortgage calculator: Your monthly mortgage payment with property tax, insurance, HOA and PMI, the total interest, and a year-by-year balance table.
• Amortization schedule calculator: A full loan payment schedule: how much of each payment is principal and interest, and what extra payments save you.
• Paycheck calculator (US take-home pay): Your net pay after federal tax, Social Security, Medicare, state tax, 401(k) and insurance, for weekly to monthly pay.
• Crypto profit and loss calculator: Your profit or loss on a coin after buy and sell fees and tax, with the break-even sell price and return on investment.
• Student loan payoff calculator: When your student loan is paid off, and how much time and interest extra monthly or one-time payments save.
• Debt-to-income (DTI) ratio calculator: Your front-end and back-end debt-to-income ratio, and how lenders see it for a mortgage or loan.
• Net worth calculator: Add up what you own and what you owe to see your net worth, and your debt as a share of your assets.
• Rule of 72 calculator: How many years it takes your money to double at a given return, or the return you need to double in a set time.
• Calorie calculator: Daily calories to keep, lose or gain weight (BMR and TDEE).
• Macro calculator: Daily protein, carbs and fat in grams for your calories and diet.
• Body fat calculator: Body fat percentage with the US Navy tape method.
• Ideal weight calculator: Healthy weight range for your height, with four common formulas.
• Water intake calculator: How much water to drink a day for your weight, exercise and climate.
• Pregnancy due date calculator: Your due date and how far along you are, from your last period, conception or IVF.
• Ovulation calculator: Your fertile window, ovulation day and next periods.
• Heart rate zone calculator: Your maximum heart rate and five training zones.
• Dog and cat age calculator: Your dog's or cat's age in human years.
• Sleep calculator: The best times to go to bed or wake up, in 90-minute sleep cycles.
• One rep max calculator: Your estimated 1RM from any set, with a percentage table for training weights.
• Calories burned calculator: Calories burned by walking, running, cycling, swimming and 50+ other activities.
• Steps to distance and calories: Turn steps into kilometres and calories, or find the steps you need for a goal.
• Waist to height ratio calculator: A simple health check from your waist and height, with what the number means.
• Blood alcohol (BAC) estimator: A rough BAC estimate from drinks, weight and time, and when it reaches zero.
• Protein intake calculator: Daily protein for your weight and goal: staying healthy, building muscle or losing fat.
• Pregnancy weight gain calculator: The healthy weight gain range by week for your pre-pregnancy BMI, for one baby or twins.
• A1C to average glucose converter: Convert HbA1c to estimated average glucose in mg/dL and mmol/L, and back.
• GFR kidney function calculator: Estimate your kidney filtration rate (eGFR) and its stage from creatinine, age and sex with the CKD-EPI 2021 equation.
• Pediatric medication dosage by weight calculator: Paracetamol and ibuprofen doses for a child from their weight, in mg and mL, with the daily maximum.
• Child adult height predictor: Predict a child's adult height from both parents' heights (mid-parental method).
• IVF and frozen embryo transfer due date calculator: Your due date and key dates from the day of an embryo transfer (day 3, 5 or 6).
• Fat-free mass index (FFMI) calculator: Your muscularity score from weight, height and body fat, normalised and compared with natural limits.
• Waist-to-hip ratio calculator: Your waist-to-hip ratio, health risk and body shape (apple or pear).
• Cholesterol ratio calculator: Total to HDL ratio, non-HDL, LDL and triglyceride ratios with what each number means.
• Blood pressure category and MAP calculator: Your blood pressure category (AHA), mean arterial pressure and pulse pressure.
• Caffeine half-life and bedtime cutoff calculator: How much caffeine is still in your body at bedtime, and the latest time for your last coffee.
• Creatine dosage and loading phase calculator: Daily creatine doses for your weight, with or without a loading phase.
• Smoking money saved and health recovery counter: How much money you've saved and which health milestones you've reached since you quit smoking.
• Ergonomic standing desk and chair height guide: The right desk, chair and monitor heights for your height, sitting or standing.
• Insulin sensitivity factor calculator: Insulin-to-carb ratio and sensitivity factor from your total daily dose, with a correction dose.
• Lean body mass (LBM) calculator: Your lean body mass from three formulas (Boer, James, Hume) and your estimated body fat.
• Daily water drinking schedule planner: A schedule of when to drink water through your day, from your weight and activity.
• Glycemic index (GI) food search: Search the glycemic index of 90 common foods, filter by low, medium or high GI, and work out the glycemic load of a portion.
• Basal body temperature (BBT) fertility chart: Chart your morning temperatures and see when your temperature shifted after ovulation.
• Snellen eye chart printable: Print a Snellen chart at the right size for a home vision check at 3, 4 or 6 metres.
• Pupillary distance (PD) online ruler: Measure the distance between your pupils from a photo with a bank card as the scale, for ordering glasses.
• Period and menstrual cycle calculator: Predict your next periods, ovulation day and fertile window from your last period and cycle length, for six cycles ahead.
• Intermittent fasting window calculator: When your fast ends and your eating window opens for 12:12, 16:8, 18:6, 20:4 and OMAD, with what your body is doing hour by hour.
• Age difference calculator: The exact age gap between two people in years, months and days.
• Business days calculator: Add or subtract working days, with Saturday-Sunday or Gulf (Friday-Saturday) weekends.
• Week number calculator: The ISO week number, day of the year and quarter for any date.
• Days until calculator: How many days, weeks and hours until (or since) any date.
• Work hours calculator: Working days and hours in any month, with your weekend and holidays.
• Countdown timer: An online timer with presets and an alarm sound. Runs in your browser tab.
• Online stopwatch: A stopwatch with laps, accurate to a tenth of a second.
• Pomodoro timer: 25-minute focus sessions with short and long breaks, and a sound between them.
• World clock: The current time in major cities around the world.
• Sunrise and sunset times: Sunrise, sunset, day length and golden hour for any place and date.
• Moon phase calendar: Today's moon phase and a month calendar of phases, with illumination.
• What day of the week was it?: The weekday of any date, past or future, with the day of the year and week number.
• Your weight and age on other planets: How much you would weigh and how old you would be on Mars, Jupiter and the other planets.
• Timesheet and time card calculator: Enter start, end and break for each day of the week and get total hours, overtime and gross pay.
• Concrete calculator: How much concrete for a slab, column or footing, with bags to buy and a waste allowance.
• Paint calculator: Litres of paint for your walls and ceiling, minus doors and windows, for any number of coats.
• Tile calculator: How many tiles and boxes you need for a floor or wall, with grout gaps and spare tiles.
• Flooring calculator: Laminate, parquet or vinyl: how many packs to buy for a room, including waste.
• Wallpaper calculator: How many rolls of wallpaper a room needs, allowing for pattern repeat and openings.
• Brick and block calculator: Bricks or blocks for a wall, plus the mortar needed.
• Stair calculator: Number of steps, riser height and tread depth for a staircase, checked against comfort rules.
• Roof pitch calculator: Roof slope in degrees, percent and rise-over-run, with rafter length.
• Gravel, sand and soil calculator: Cubic metres and tonnes of gravel, sand, soil or mulch to cover an area.
• Fence calculator: Posts, panels and rails for a fence line, with a gate allowance.
• Board foot calculator: Board feet and cost of lumber from thickness, width, length and quantity.
• Drywall (plasterboard) calculator: Sheets of plasterboard, screws and joint compound for walls and ceilings.
• AC size calculator (BTU): What size air conditioner a room needs, in BTU and tons, by area, sun and people.
• Water tank calculator: Capacity of a rectangular or round tank in litres, and how long it lasts.
• Solar panel calculator: Panels, battery and inverter needed to cover your electricity use.
• Appliance energy cost calculator: What each appliance costs to run per day, month and year.
• Ohm's law calculator: Voltage, current, resistance and power: enter any two and get the rest.
• Resistor colour code calculator: Read a resistor's value from its colour bands (4, 5 or 6 bands), or find the bands for a value.
• Series and parallel calculator: Total resistance, capacitance or inductance for parts in series or parallel.
• LED resistor calculator: The resistor an LED needs, with its power rating and the closest standard value.
• Voltage drop calculator: Voltage lost along a copper or aluminium cable, and whether the cable is thick enough.
• Battery life calculator: How many hours a battery lasts for a given load, with a safety margin.
• kVA, kW and amps calculator: Convert between kVA, kW and amps for single and three phase power.
• Voltage divider calculator: Output voltage of a two-resistor divider, or the resistors for a target voltage.
• 555 timer calculator: Frequency, duty cycle and timing for a 555 timer in astable or monostable mode.
• Gear ratio calculator: Gear ratio, output speed and torque from the teeth of the gears.
• Wire gauge (AWG) calculator: Diameter, area, resistance and safe current of a wire gauge, and the voltage drop over your cable run.
• Decibel to voltage and power ratio converter: Convert decibels to voltage, pressure and power ratios and back.
• Hydraulic cylinder force and speed calculator: Push and pull force, speed and oil volume of a hydraulic cylinder from its bore, rod, pressure and flow.
• Beam deflection and load calculator: Deflection, bending moment, reaction and stress of a simple beam or cantilever under a point or uniform load.
• Periodic table: An interactive periodic table with every element's mass, group, electrons and uses, in English and Arabic.
• Molar mass calculator: The molar mass of any formula like Ca(OH)2, with the percentage of each element.
• Chemical equation balancer: Balance a chemical equation and see the coefficients step by step.
• Punnett square calculator: Cross two parents' genes and see the genotype and phenotype chances.
• DNA tools: Complement, reverse complement, transcribe to RNA, translate to protein and count bases.
• Dilution calculator: C1V1 = C2V2: how much stock and diluent to mix for the concentration you need.
• Half-life calculator: Amount remaining, time elapsed or the half-life itself for decay and growth.
• Projectile motion calculator: Range, height and flight time of a thrown object, with its path drawn.
• Blood type calculator: What blood types a child can have from the parents' blood types and Rh factor.
• Speed, distance and time calculator: Enter any two of speed, distance and time and get the third, in km, miles, metres or knots.
• Force, mass and acceleration calculator: Newton's second law (F = ma): find the force, the mass or the acceleration, with the weight on Earth.
• Kinetic and potential energy calculator: The energy of a moving or raised object, the speed it falls at, and its momentum.
• Ideal gas law calculator: PV = nRT: find the pressure, volume, amount or temperature of a gas in any units.
• Specific heat and heat energy calculator: How much heat it takes to warm a material, for water, metals, glass and more, with the time a heater needs.
• Density, mass and volume calculator: Enter any two of density, mass and volume and get the third, with a check for whether it floats.
• Tide time calculator (rough estimate): Estimate the high and low tide times for a port from the moon and the port's high water interval.
• Baking pan size converter: Change a recipe from one pan to another: round, square or loaf, with the new amounts.
• Pizza dough calculator: Flour, water, salt and yeast for any number of pizzas, with hydration and rise time.
• Coffee to water ratio calculator: Grams of coffee and water for pour over, French press, espresso, moka and cold brew.
• Meat roasting time calculator: Oven time and safe internal temperature for chicken, lamb, beef and turkey by weight.
• Recipe scaler: Scale a whole recipe up or down: paste the ingredients and get the new amounts, with fractions.