# Calculat — Precision Calculators & Unit Converters

> Calculate anything with precision. Calculat is a free online library of 4,270+ calculators and unit converters across 16 categories (finance, health, math, conversion, date & time, construction, statistics, education, physics, chemistry, engineering, everyday, food, biology, ecology, and sports). Every calculator page explains its formula, provides step-by-step examples, and is reviewed by a qualified expert. Available in English, Spanish, French, German, Portuguese, Russian, Arabic, Hindi, Japanese, and Simplified Chinese.

## Core resources

- [Homepage](https://www.calculat.online/): Overview of all categories and trending calculators.
- [Category index](https://www.calculat.online/a-z-index): Complete alphabetical list of every calculator.

## Category hubs

- [Financial calculators](https://www.calculat.online/financial-calculators): Mortgage, loan, retirement, investment, tax, salary, and budgeting tools.
- [Health calculators](https://www.calculat.online/health-calculators): BMI, BMR, calorie, body-fat, and medical reference calculators.
- [Math calculators](https://www.calculat.online/math-calculators): Algebra, geometry, statistics, and everyday math tools.
- [Conversion calculators](https://www.calculat.online/conversion-calculators): Unit conversions across 16 dimensions (length, mass, volume, temperature, speed, pressure, energy, power, time, digital, angle, force, frequency, torque, acceleration).
- [Date & time calculators](https://www.calculat.online/date-time-calculators): Age, duration, working-day, and schedule tools.
- [Construction calculators](https://www.calculat.online/construction-calculators): Concrete, tile, roofing, framing, and material calculators.
- [Statistics calculators](https://www.calculat.online/statistics-calculators): Descriptive statistics and probability tools.
- [Education calculators](https://www.calculat.online/education-calculators): GPA, grade, and academic tools.
- [Physics calculators](https://www.calculat.online/physics-calculators): Motion, mechanics, and electricity tools.
- [Chemistry calculators](https://www.calculat.online/chemistry-calculators): Molarity, stoichiometry, and solution tools.
- [Engineering calculators](https://www.calculat.online/engineering-calculators): Structural, electrical, and mechanical calculators.
- [Everyday calculators](https://www.calculat.online/everyday-calculators): Tips, splits, discounts, and day-to-day tools.
- [Food calculators](https://www.calculat.online/food-calculators): Cooking conversions, portion, and nutrition tools.
- [Biology calculators](https://www.calculat.online/biology-calculators): Genetics and physiology tools.
- [Ecology calculators](https://www.calculat.online/ecology-calculators): Carbon, water, and environmental tools.
- [Sports calculators](https://www.calculat.online/sports-calculators): Pace, percentage, and training tools.

## Popular calculators

- [Mortgage Calculator](https://www.calculat.online/financial-calculators/mortgage-calculator)
- [BMI Calculator](https://www.calculat.online/health-calculators/bmi-calculator)
- [Loan Calculator](https://www.calculat.online/financial-calculators/loan-calculator)
- [Compound Interest Calculator](https://www.calculat.online/financial-calculators/compound-interest-calculator)
- [Retirement Calculator](https://www.calculat.online/financial-calculators/retirement-calculator)
- [Salary Calculator](https://www.calculat.online/financial-calculators/salary-calculator)
- [Calorie Calculator](https://www.calculat.online/health-calculators/calorie-calculator)
- [Tip Calculator](https://www.calculat.online/everyday-calculators/tip-calculator)
- [Currency Calculator](https://www.calculat.online/financial-calculators/currency-calculator)
- [GPA Calculator](https://www.calculat.online/education-calculators/gpa-calculator)

## Trust & editorial

- [About Calculat](https://www.calculat.online/about)
- [Our Expert Authors & Reviewers](https://www.calculat.online/author)
- [Editorial Policy](https://www.calculat.online/editorial-policy)
- [Privacy Policy](https://www.calculat.online/privacy)
- [Terms of Use](https://www.calculat.online/terms)
- [Contact](https://www.calculat.online/contact)

## Languages

- [Español](https://www.calculat.online/es)
- [Français](https://www.calculat.online/fr)
- [Deutsch](https://www.calculat.online/de)
- [Português](https://www.calculat.online/pt)
- [Русский](https://www.calculat.online/ru)
- [العربية](https://www.calculat.online/ar)
- [हिन्दी](https://www.calculat.online/hi)
- [日本語](https://www.calculat.online/ja)
- [简体中文](https://www.calculat.online/zh-CN)