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Calculators
Why ovulation isn't "day 14" — how your fertile window is actually calculated
The most repeated fact about the menstrual cycle — ovulation happens on day 14 — is wrong for most people. Here's where the number comes from, why cycle length changes everything, and how to actually estimate your ovulation day and fertile window.
Calculators
How many calories should you eat per day? BMR vs TDEE, explained simply
Most calorie advice skips the two numbers that actually matter: your BMR (what your body burns at rest) and your TDEE (what you burn in real life). Here's how they differ, how they're calculated, and which one to use for losing, maintaining or gaining weight.