Free Online Calculators

Fast, accurate, and easy-to-use calculators for everyday math. No signup required — just calculate.

Pregnancy Calculator

Calculate your due date, current pregnancy week, trimester, and important milestones throughout your journey.

Calculate your exact age in years, months, days, hours, and minutes. Find out how many days until your next birthday.

Calculate the tip amount and total bill. Split the bill between multiple people with custom tip percentages.

Calculate the number of days between two dates. Add or subtract days from any date to find a new date.

Calculate percentages easily. Find what percent one number is of another, increase/decrease by percentage, and more.

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Instant results as you type. No waiting, no page reloads.

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Precise calculations you can trust for important decisions.

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Mobile-friendly design. Use on any device, anywhere.