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Free Online Calculators
for Money, Health, School & Daily Life

From mortgages and taxes to BMI, grades, unit conversions, and time planning, find the right calculator in a few clicks.

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174Calculators
8Categories
1M+Calculations
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Start With These Popular Calculators

A hand-picked set of everyday tools to get you started

Finance

Mortgage Calculator

Calculate your monthly mortgage payment, total interest, and amortization schedule.

Health

BMI Calculator

Calculate your Body Mass Index and interpret your weight category.

Paycheck

Paycheck Calculator

Estimate your take-home pay after federal, state, and local taxes.

Math

Percentage Calculator

Calculate percentages, percent change, and percent of a number.

Education

Grade Calculator

Calculate your weighted course grade from assignment scores.

Date & Time

Age Calculator

Calculate exact age in years, months, and days from any birthdate.

Health

Calorie Calculator

Find out how many calories you need daily to reach your goals.

Finance

Compound Interest Calculator

See how your investments grow with the power of compound interest.

Growing Library

Live Now, With More on the Way

Calculators.RUN currently offers 174 live calculators across 8 categories, with 55 more already scheduled. Browse what is available today and keep an eye on the rest of the roadmap.

Browse All Calculators
availability.txt
finance   69 live / 69 total
paycheck  11 live / 12 total
health    35 live / 35 total
education  9 live / 10 total
math      39 live / 52 total
date-time  9 live / 12 total
science    1 live / 16 total
utility    1 live / 23 total

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Step 1

Search

Type a keyword like "mortgage" or "age" to find the right tool instantly.

Step 2

Pick

Choose from 174 live calculators across 8 categories.

Step 3

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Enter your values and get clear, reliable results instantly.

How People Use Calculators.RUN

Common tasks our calculators help with

Ho

Home Buyers

Mortgage planning

I compare monthly payments and interest totals before talking to a lender.

Fr

Freelancers

Take-home pay

I use the paycheck and self-employment tools to estimate what I should set aside for taxes.

St

Students

Grades and GPA

The grade and final exam calculators help me see exactly what score I need.

Pa

Parents

Due date planning

Pregnancy and due date tools make timelines easier to understand at a glance.

Fi

Fitness Beginners

Calories and macros

BMI, calorie, and macro calculators give me a quick starting point without overcomplicating things.

Re

Remote Teams

Time zone planning

The time zone tools save us from back-and-forth when scheduling across countries.

Te

Teachers

Course planning

Weighted grade and attendance calculators make classroom math much faster.

DI

DIY Homeowners

Project estimates

Concrete, area, and unit tools help me price small home projects before I buy materials.

Ma

Managers

Percent and margin math

I use the percentage and margin calculators for quick checks during meetings.

Re

Researchers

Statistical checks

Sample size, z-score, and standard deviation tools are useful for quick sanity checks.

El

Electricians

Voltage and resistance

The electrical calculators are handy when I need a fast field estimate.

Ev

Everyday Planners

Dates and budgets

Age, date, savings, and tax calculators cover the questions that come up all the time.

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