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Basal body temperature (BBT) fertility chart
Chart your morning temperatures and see when your temperature shifted after ovulation.
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- Works on any device
About Basal body temperature (BBT) fertility chart
Enter your waking temperature each morning and see it plotted across your cycle. After ovulation, progesterone raises basal body temperature by roughly 0.2 to 0.5 C, and it stays higher until your period. Three higher readings after six lower ones suggest ovulation has already happened.
How to use Basal body temperature (BBT) fertility chart
- Enter your temperature each morning after waking, before you get up.
- Add readings across your cycle.
- Look at the chart for a lasting rise that suggests ovulation has passed.
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
Does BBT tell me when I will ovulate?
No, it confirms ovulation after it happens. Use many cycles of charts to spot your usual pattern and plan ahead.
When should I take my temperature?
Take it at about the same time each morning, before eating, drinking or getting up, using the same thermometer. Consistency matters more than the exact hour.
What can disturb my readings?
Illness, alcohol, poor sleep and irregular wake times can all change the reading. Note them and treat odd days with caution when reading the pattern.
Is Basal body temperature (BBT) fertility chart free?
Yes. Basal body temperature (BBT) fertility chart 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 Basal body temperature (BBT) fertility chart 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.