Contraception and sexual health tools

Information tools for contraception and sexual health, including the time limits for emergency contraception and when an STI test can give a reliable result. They do not replace advice from a clinician.

8 free calculators

Safe Period / Safe-Sex Day Estimator - Lower-risk and high-risk days, with honest limits. Also called: safe days calculator, calendar method calculator, rhythm method calculator.
Pregnancy Risk Information Tool - Estimate pregnancy risk from a single act, by cycle day and method. Also called: chance of pregnancy calculator, could I be pregnant, pregnancy probability calculator.
Emergency Contraception Time Window Calculator - How many hours you have left for each emergency option. Also called: morning-after pill time calculator, emergency contraception time limit, levonorgestrel 72 hours.
Condom Size Guide - Find the right condom width for a better, safer fit. Also called: condom size calculator, condom size chart, condom girth calculator.
Contraception Comparison Tool - Compare 14 birth control methods against your priorities. Also called: birth control comparison, contraceptive effectiveness chart, compare contraception methods.
Birth Control Pill Reminder Schedule - Your pill calendar with active and break days. Also called: pill reminder, birth control calendar, pill pack schedule.
STI Testing Date Guide - When to test for chlamydia, HIV, syphilis and more. Also called: STD test window period, when to get tested for STI, STI window period calculator.
Breastfeeding and Fertility Eligibility Checker - Check if breastfeeding can work as contraception (LAM). Also called: LAM calculator, lactational amenorrhea method, breastfeeding birth control.

More health calculators

These calculators are for education only and are not medical advice. See the medical disclaimer and how we build and review our tools. Looking for medicine prices? Compare medicine prices in 32 countries on MediHub.