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Free online calculators for math, finance, health, and more. Fast, accurate, works on any device.

Browse by Category

Math

Percentage, ratio, average, and algebra calculators.

3 tools

Finance

Compound interest, loan EMI, ROI, and savings calculators.

3 tools

Health & Fitness

BMI, calorie, body fat, and macros calculators.

2 tools

Date & Time

Days between dates, age calculator, and timezone tools.

2 tools

Text & Writing

Word counter, case converter, lorem ipsum, and more.

2 tools

Automotive

Tyre age, fuel cost, MPG, depreciation, and road trip tools.

7 tools

Office & Design

Test print page, color tools, and office utilities.

1 tool

Unit Converters

Length, weight, temperature, speed, and area converters.

2 tools

Developer Tools

JSON formatter, Base64, URL encoder, regex tester.

2 tools

All Tools

Percentage Calculator

Calculate percentages, find percentage change, and more.

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Ratio Calculator

Simplify ratios and solve proportions.

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Average Calculator

Mean, median, mode, and range in one tool.

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Compound Interest Calculator

See how your savings or investments grow over time.

Open tool

Loan EMI Calculator

Calculate your monthly loan repayment.

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Tip Calculator

Split the bill and calculate tips instantly.

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BMI Calculator

Calculate your Body Mass Index.

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Calorie Calculator

Find your daily calorie needs (TDEE).

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Days Between Dates

Find the number of days between any two dates.

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Age Calculator

Calculate exact age from a date of birth.

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Word & Character Counter

Count words, characters, sentences, and paragraphs.

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Text Case Converter

Convert text to upper, lower, title, or camelCase.

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Tyre Age Calculator

Check how old your tyres are from the DOT code.

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Fuel Cost Calculator

Calculate the fuel cost of any journey.

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MPG & Fuel Efficiency Calculator

Calculate MPG or convert between fuel efficiency units.

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Tyre Pressure Converter

Convert tyre pressure between PSI, bar, and kPa.

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Car Depreciation Calculator

Estimate how much your car has lost in value.

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Road Trip Cost Calculator

Plan the total cost of your road trip.

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GPS Speedometer

New

Real-time speed from your device GPS.

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Test Print Page

New

Print a full test page to check colour, alignment, and text.

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Length Converter

Soon

Convert between metres, feet, inches, miles, and more.

Coming soon

Temperature Converter

Soon

Convert between Celsius, Fahrenheit, and Kelvin.

Coming soon

JSON Formatter

Soon

Format, validate, and minify JSON.

Coming soon

Base64 Encoder / Decoder

Soon

Encode and decode Base64 strings instantly.

Coming soon

Free Tools for Everyday Calculations

Utiltrix Toolkit is a growing library of free, browser-based calculators and utilities. Whether you need to work out a percentage, calculate compound interest, or convert units, you'll find a fast, accurate tool here — no account, no ads, no tracking.

Every tool is built with precision and clarity in mind. Formulas are shown alongside results so you always understand what's being calculated. Tools work on mobile, tablet, and desktop equally well.