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tip calculator Split a bill, set a tip percentage, see what each person owes. bmi Body mass index in metric or imperial, with the standard WHO category bands. age Exact age in years, months, and days from a date of birth. due date Estimate a due date from the last menstrual period using Naegele's rule. date difference How many years, months, weeks, days between two dates. business days Count weekdays between two dates, or shift a date by N business days. sleep cycle Pick a wake time, get the six best moments to fall asleep based on 90-minute cycles. mortgage Monthly payment, total interest, amortization schedule, PDF export. loan amortization Monthly payment and full schedule for any fixed-rate loan. compound interest Project a balance with regular contributions and any compounding frequency. calorie / tdee BMR via Mifflin-St Jeor and TDEE based on activity level. macros Split daily calories into protein, carbs, and fat by preset ratio or custom. unit converter Length, mass, volume, temperature, area, speed, data, energy, cooking.