Track your fertile window and estimated ovulation date based on your last menstrual period. Helps with family planning. Everything runs locally in your browser — nothing is uploaded.
Calculate your estimated due date from the first day of your last period. Get trimester dates and important pregnancy milestones. Everything runs locally in your browser — nothing is uploaded.
Log your daily food intake with a built-in common foods database. Track total calories consumed throughout the day. Everything runs locally in your browser — nothing is uploaded.
Calculates Basal Metabolic Rate using the Mifflin-St Jeor equation with age, sex, height, and weight. Nutritionists use it for diet planning. Everything runs locally in your browser — nothing is uploaded.
Add or subtract days from any date. Get the resulting date instantly — useful for deadlines, scheduling, and planning. Everything runs locally in your browser — nothing is uploaded.
Calculate revenue growth rate by comparing current period revenue to previous period. Track your business growth over time. Everything runs locally in your browser — nothing is uploaded.
Ovulation ≈ 14 days before the next period; the fertile window is the 5 days before plus ovulation day (sperm survive up to 5 days, the egg ~24h). Example: 28-day cycle starting May 1 → ovulation ≈ May 15, fertile May 10–15.
Calendar estimates weaken with irregularity — a 21–35 day range shifts ovulation by ±7 days. Track 3+ cycles to find your average, and confirm with basal-body-temperature or LH strips for conception timing.
No — calendar method alone fails ~24% yearly with typical use. Ovulation shifts with stress and illness. Use barrier or hormonal contraception if avoiding pregnancy.
Yes, by adding your average cycle length to the last period start. Log actual starts to keep predictions calibrated — the tracker improves as history grows.
No. All tracking runs locally in your browser. No health data is transmitted or stored.