Period Tracker

Log your periods privately on your device, see your average cycle and get predictions for your next periods and fertile days.

Last updated:

Stored only on this device.

Next period expected—Log the start date of your last period

Your log

    A private period tracker

    Most period apps ask you to create an account and send your health data to their servers. This period tracker doesn't: every date you log stays only on your device. Log the day each period starts, and it works out your average cycle length, how regular your cycles are, and predicts yournext periods and fertile days on a calendar. It's quick to use from your phone's browser — add it to your home screen for one-tap access.

    How to use it

    1. Log the first day of your most recent period (and earlier ones, if you remember them).
    2. Each month, log the new start date when your period begins.
    3. Export a backup now and then; import it on a new phone.

    Example

    You log periods starting on 2 July, 31 July, 29 August and28 September. The gaps are 29, 29 and 30 days, so your average cycle is about29.3 days and quite regular. Your next period is predicted for about 27 October, with likely ovulation around 13 October. For a detailed fertile-window plan, use theovulation calculator; once pregnant, thedue date calculator takes over.

    Health disclaimer: This tool gives general estimates for information only and is not medical advice, diagnosis or treatment. Please consult a qualified doctor about your health. Read the full disclaimer.

    Frequently asked questions

    Is my period data private?
    Yes. Your dates are stored only in this browser on this device (local storage). There is no account and nothing is uploaded. Clearing your browser data deletes them, so use Export to keep a backup file.
    How does the tracker predict my next period?
    It averages the gaps between your last six logged period start dates, then adds that average to your most recent period. The more cycles you log, the better the prediction. Until you have two logged periods, it uses the default cycle length you set.
    What is a normal cycle length?
    Anywhere from about 21 to 35 days is common in adults, and it can vary by a few days from month to month. Cycles that are often shorter than 21 days, longer than 35 days, or vary by more than 7–9 days are worth discussing with a doctor.
    Can irregular periods be a sign of PCOS?
    Irregular or missed periods are one of the common signs of PCOS, which affects many women in India, but they have many other causes too, such as stress, thyroid problems or weight changes. See a gynaecologist for a proper diagnosis.

    Ovulation Calculator

    Find your fertile window, likely ovulation day and next period dates for the coming six cycles on a calendar — calculated privately in your browser.

    Pregnancy Due Date Calculator

    Find your due date from your last period, conception or IVF transfer, plus your current week, trimester and scan dates.

    Water Intake Calculator

    How much water to drink each day for your weight, exercise and hot weather — in litres and glasses, with an easy drinking schedule for the day.

    Sleep Cycle Calculator

    Find the best time to go to bed or wake up so you wake between 90-minute sleep cycles and feel fresher — with recommended 7½ to 9 hour options.

    BMI Calculator

    Calculate your Body Mass Index from height and weight (metric or feet/inches) with Asian-Indian BMI categories.

    BMR Calculator

    Calculate your basal metabolic rate with the Mifflin-St Jeor, Harris-Benedict and Katch-McArdle formulas, plus calories burned at each activity level.