Basal body temperature chart
One dot a morning, one cycle a page.
Examples temporarily replace the input and settings. You can restore your previous work.
Pro keeps the settings you use every week and puts them one click away. See Pro
Your files stay on your device
This tool runs entirely in your browser. Nothing is uploaded, nothing is stored, and you can even turn off your internet connection before you start.
Example
Worked example — BBT chart
Use the following inputs and settings. Keep other settings at the page defaults.
| Item | Value |
|---|---|
| Scale | °C |
| Days | 35 |
| First day of the cycle (optional, prints the dates) | 2026-11-02 |
| Output files | 1 |
| PDF pages | 1 |
| 279 × 216 mm |
Expected result — PDF · PDF pages: 1. The image shows the first PDF page.
How it works
- Choose °F or °C and how many days the chart covers.
- Enter the first day of your cycle to print the dates, or leave it blank.
- Print; each morning before getting up, take your temperature and mark a dot, then join the dots.
Frequently asked questions
- How do I take my basal temperature?
- At the same time every morning, right after waking and before getting up, with a basal thermometer that shows two decimals.
- What do the other rows mean?
- Write the date and time, shade the days of your period, and note anything that may change the reading — illness, a late night, travel or medication.
- Does the chart tell me when I ovulate?
- No — it is a chart to fill in; it does not work anything out. Talk to your doctor about reading your chart.
- Can I print one for each cycle?
- Yes — enter the new start date and print again.
- Is anything uploaded?
- No. The pages are made in your browser.
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