18 free tools · no sign-up

Every calculator you need, worked out to the decimal.

Finance, health, images and everyday utilities — fast, accurate, and built to run entirely in your browser.

Try the BMI Calculator Browse all tools

Sample Output — BMI

22.4

Normal weight

Height175 cm

Weight68.5 kg

Tool library

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Every calculator on this site runs instantly, with no data leaving your device.

Finance Calculators

Loans, EMIs, GPA and percentages — worked out instantly.

GPA Calculator

Weighted GPA from your course credits and grades.

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Loan Calculator

Monthly payment, total interest and payoff cost.

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EMI Calculator

Equated monthly installment on any loan amount.

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Percentage Calculator

Percent of a number, ratios and % change.

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Health Calculators

BMI, calories and body composition, explained clearly.

BMI Calculator

Body Mass Index from your height and weight.

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BMR Calculator

Calories burned at rest (Mifflin-St Jeor).

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Calorie Calculator

Daily maintenance calories by activity level.

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Body Fat Calculator

US Navy circumference body-fat estimate.

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Water Intake Calculator

Daily water target by weight and activity.

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Ideal Weight Calculator

Devine formula ideal weight range.

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Image Tools

Convert, compress and edit images — right in your browser.

Image Converter

Convert between PNG, JPEG and WebP.

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Image Compressor

Shrink file size while keeping quality.

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Image to PDF

Combine one or more images into a PDF.

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Watermark Remover

Blur or patch out a logo or object you own.

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Utility Tools

The everyday tools you reach for most.

Unit Converter

Length, weight, volume and temperature.

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QR Code Generator

Turn any text or link into a QR code.

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Word Counter

Words, characters and reading time, live.

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From the blog

Guides & explainers

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Why CalculatorTools

Built for accuracy and speed

Runs in your browser

Every calculation happens on your device — nothing you type is uploaded to a server.

No account needed

Open a tool and use it immediately. No sign-up, no email, no paywall.

Mobile-friendly

Every page is fully responsive, from phones to desktop monitors.

Clear methodology

Each calculator explains the formula it uses, so you can trust the number.