Free online calculators that just work

21 fast, accurate tools for finance, health, and everyday life. No sign-up. No clutter.

💰 Finance

Loans, savings, investing and interest. View all →

Compound Interest Calculator

See how savings and investments grow over time.

Simple Interest Calculator

Interest that does not compound — quick and exact.

Mortgage Payment Calculator

Monthly principal & interest on a home loan.

Car Loan Calculator

Monthly payment and total interest on an auto loan.

Savings Goal Calculator

How much to set aside each month to hit a target.

ROI Calculator

Percentage return from an initial and final value.

CAGR Calculator

Annualized growth rate between two values.

🧮 Everyday

Tips, discounts, tax and percentages. View all →

Tip Calculator

Tip and split a bill in seconds.

Discount Calculator

Final price after a percentage off.

Sales Tax Calculator

Add tax to any price instantly.

Percentage Calculator

What is X% of Y — instantly.

Percentage Change Calculator

Percent increase or decrease between two numbers.

Hourly to Salary Calculator

Convert an hourly wage to yearly, monthly and weekly pay.

❤️ Health

BMI, calories, body metrics and hydration. View all →

BMI Calculator

Body Mass Index from height and weight.

Calorie (TDEE) Calculator

Maintenance calories from the Mifflin-St Jeor formula.

Body Fat Calculator

Estimate body fat with the U.S. Navy method.

Ideal Weight Calculator

A clinical body-weight estimate from your height.

Water Intake Calculator

How much water to drink per day.

📅 Time & Dates

Age and date math. View all →

Age Calculator

Exact age in years, months and days.

Date Difference Calculator

Days, weeks and months between two dates.

Days Until Calculator

Count down the days to any date.