BBT & Fertility Awareness Log
A private, day-by-day record of your waking temperature and cervical mucus — for observing your own patterns, not for predicting them.
Awareness tool — not contraception.
This log is for cycle awareness and personal tracking only. It is not a taught fertility awareness method (such as the Sympto-Thermal Method with proper instruction), and it must not be used or relied on as a standalone contraception method. It shows only the temperature and mucus data you enter, plus a simple marker of when a sustained temperature shift pattern appears — a pattern like this often follows ovulation, but this log cannot tell you when you are fertile and does not identify safe days. For contraception or conception decisions, use a properly instructed method and consult a qualified healthcare provider.
The Ovulation Calculator and Cycle Symptom Log on this site are complementary awareness tools, not replacements for a taught method — and not substitutes for advice from your healthcare provider.
100% private. Your entries are stored only in this browser and are never sent to our servers. Clearing your browser data or using a different device will not show your past entries. Use the Export button to save a backup.
Log an observation
Taken after at least 3 hours of sleep, before getting out of bed if possible. Valid range 35–40 °C.
Morning temperatures are the most meaningful for this kind of chart — temperature taken later in the day is affected by activity, food and movement, so note the time if it was not a morning reading.
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Your temperatures
Your data
Download a backup or erase everything stored in this browser.
This log is for your own observation and to share with your doctor or a fertility awareness educator if helpful. It does not diagnose or predict anything, and it does not tell you when you are fertile. See the medical disclaimer at the bottom of the page for details.
Related tools & calculators
Ovulation Calculator
Predict ovulation day and your fertile window.
Open calculatorPeriod Calculator
Predict your next three period start dates.
Open calculatorCycle Symptom Log
Track your flow, mood, energy and cramps day by day — no formula, just a private record you own. No formula — a personal log stored only in your browser.
Open the log