Free tools

Planning calculators

Quick, private calculators for the numbers behind your plans. No sign-up, no ads. Each one links to the offline planner that helps you act on the result.

Womens Health

Ovulation Calculator

Free ovulation calculator: find your fertile window, peak days and estimated ovulation date from your last period and cycle length. Then track it in a TTC planner.

Due Date Calculator

Free pregnancy due date calculator. Estimate your due date, current week, trimester and milestone dates from your last period, conception date or IVF transfer.

Health & Wellness

TDEE Calculator

Free TDEE calculator using the Mifflin-St Jeor formula. Find your maintenance calories plus cut and bulk targets, then track the deficit in a weight-loss planner.

Money & Budget

Debt Snowball Calculator

Free debt snowball calculator. See your debt-free date, total interest and a month-by-month plan, and compare snowball vs avalanche vs minimum payments.

Numbers are step one. Planners are step two.

Browse all planners