Everyday Calculators

Fast, free calculators for dates, money, health, school, and measurements — instant answers, no sign-up.

What this category is for

Fast, free calculators for dates, money, health, school, and measurements — instant answers, no sign-up. These tools are meant for local, browser-first work: cleaning, comparing, estimating, and generating something you can use right away.

Common starting points

Percentage Calculator Work out X% of Y, what percent one number is of another, and percent change.
Square Footage Calculator Calculate area from a length and width, even when each side is measured in a different unit.
Length Unit Converter Convert feet, inches, yards, miles, millimeters, centimeters, meters, and kilometers instantly.

Percentage Calculator

Work out X% of Y, what percent one number is of another, and percent change.

Square Footage Calculator

Calculate area from a length and width, even when each side is measured in a different unit.

Length Unit Converter

Convert feet, inches, yards, miles, millimeters, centimeters, meters, and kilometers instantly.

Age Calculator

Find an exact age in years, months, and days, plus weeks, days, and the next birthday.

Date Calculator

Count days between dates, add or subtract time, or count business days.

Tip Calculator

Split a bill, set a tip percentage, and get the per-person total with optional rounding.

Loan & Mortgage Calculator

Estimate a monthly payment, total interest, and a full amortization schedule.

Salary to Hourly Calculator

Convert between hourly, weekly, monthly, and annual pay from any starting figure.

BMI Calculator

Estimate body mass index from height and weight in metric or imperial units.

GPA Calculator

Add your courses, grades, and credits for a weighted and unweighted GPA.

Pregnancy Due Date Calculator

Estimate a due date and current week from a last period, conception, or IVF date.

Time Zone Meeting Planner

Compare one meeting time across several time zones with daylight-saving handled.