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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.
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- Works on any device
About Caffeine half-life and bedtime cutoff calculator
See how much caffeine remains in your body at bedtime, using a half-life of about five hours, and find the latest time for your last coffee. A cup of coffee holds roughly 80 to 100 mg. Half-life varies by person, being longer in pregnancy and with some medicines.
How to use Caffeine half-life and bedtime cutoff calculator
- Add the drinks you had and the time of each.
- Enter your bedtime.
- Read how much caffeine remains then, and the latest time for your last coffee.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Free to embed on your own website, with a ready-made code to copy.
- Available in 10 languages.
Also known as
Frequently asked questions
How long does caffeine stay in your body?
The half-life is about five hours for most adults, so half of a coffee is still active five hours later. Traces last much longer.
What is caffeine half-life?
It is the time for the body to clear half of the caffeine. The tool uses a typical value, but yours may be shorter or longer.
Why might I be more sensitive than the result suggests?
Pregnancy, some medicines, genetics and liver health can slow how fast caffeine is cleared. Treat the tool as a general estimate.
Is Caffeine half-life and bedtime cutoff calculator free?
Yes. Caffeine half-life and bedtime cutoff calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.
Can I put Caffeine half-life and bedtime cutoff calculator on my own website?
Yes. Use the Embed on your site button under the tool to copy a short piece of code and paste it into your page. It is free, needs no account, and the tool keeps working inside your page.
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