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Predict your next few periods, ovulation and fertile window from your last period.
Results update as you type.
[Translation temporarily unavailable. Please try again.]
you’re not sure when your next period is due, you can use the period calculator to predict when your next period is due. The calculator will show you the average length of your period, the fertile window, and the date of your next period. If you’re not sure when your next period is due, you can use the period calculator to predict when your next period is due. If you’re not sure when your next period is due, you can use the period calculator to predict when your next period is due. If you’re not sure when your next period is due,
Tambayoyi da ake yi da yawa
Shin, kun san yaushe ne haihuwata take?
Each period is one cycle length after the previous one, so the tool adds your cycle length (28 days by default) to the first day of your last period, and repeats that to project the next several months.
Shin, abin da yake da kyau ga wani alƙawari na wata?
"Ya yi zato da cewa akwai sãshen halitta wanda yake da wani abu daga cikinsu wanda yake da wata alaƙa da wani sãshen halittar."
Mẽne ne idan cikõkina sun kasance sãɓawa jũna?
Enter your average cycle length for a best guess, but the prediction will be less reliable. Tracking several cycles or using an ovulation kit gives a clearer picture than a fixed-length calendar estimate.
Yaushe za a fara watan haihuwa na gaba?
It is one cycle length after your last period began, so on a 28-day cycle your next period is due 28 days after the previous one started. The tool projects several months ahead using the average cycle length you enter.
Ta yaya zan iya samun tsawon na na gaba?
Log the first day of each period for a few months, then average the gaps between them. Entering that average gives more accurate predictions than assuming a fixed 28-day cycle.
Can this tool also show my fertile days?
Kuma lalle ne, haƙĩƙa, Allah Ya saukar da Littãfi mai tsarki dõmin ku sani cẽwa lalle ne Allah Mai gãfara ne, Mai jin ƙai.
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[Translation temporarily unavailable. Please try again.] Anything you omit uses the same default this page is pre-filled with; an unknown parameter is a 400, never a silent zero. [Translation temporarily unavailable. Please try again.] →
Endpoint
GET https://calculator.free/api/v1/period/curl
curl "https://calculator.free/api/v1/period/?lmp=2026-06-25&cycle=28"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/period/?" + new URLSearchParams({
"lmp": "2026-06-25",
"cycle": "28"
}));
const data = await r.json();
console.log(data.results);Results are estimates for general guidance only, not financial, medical or tax advice.