Exact 100% free No sign-up Instant

Convert anything. Get the exact answer.

Fast, precise converters for length, weight, temperature, volume, speed, data, pressure and more, plus number bases and Roman numerals. Type a value and see it in every unit at once, with no sign-up.

1 mi = 1.609 km100°C = 212°F1 kg = 2.205 lb1 GB = 1000 MB
Open length converter Temperature converter

Why convert here

Most converter sites bury one tool under a wall of ads and pop-ups. This is a clean set of precise converters that load fast and just give you the answer.

Exact factors

Every conversion uses the precise, standard definition of the unit, not a rounded shortcut.

100% free

Every converter, every unit, with no paid tier and no locked options.

No sign-up

No account, no login, no email wall. Type a number and read the answer.

Instant as you type

Results update with every keystroke, with a full table of every unit at once.

Works offline

Load a converter once and it keeps working with no connection.

15 converters, no catch

Pick a converter and start instantly. Every one runs in your browser, free.

Everyday units

Length Converter Metres, feet, miles, inches, km and more, instantly. Weight & Mass Converter Kilograms, pounds, ounces, grams and stone. Temperature Converter Celsius, Fahrenheit and Kelvin, both ways. Volume Converter Litres, gallons, cups, pints and cooking units. Speed Converter km/h, mph, m/s, knots and ft/s. Time Converter Seconds, minutes, hours, days, weeks and years. Fuel Economy Converter MPG (US/UK), L/100km and km/L.

Science & tech

Area Converter Square metres, feet, acres, hectares and miles. Pressure Converter bar, psi, kPa, atm, mmHg and torr. Energy Converter Joules, calories, kWh, BTU and more. Power Converter Watts, kilowatts, horsepower and BTU/h. Angle Converter Degrees, radians, gradians, turns and arcminutes.

Digital & numbers

Data Storage Converter Bits, bytes, KB/MB/GB/TB and binary KiB/MiB/GiB. Number Base Converter Binary, octal, decimal and hexadecimal, all at once. Roman Numeral Converter Numbers to Roman numerals and back, 1 to 3999.

Exact by design, not rounded.

Every conversion uses the precise, internationally defined factor for the unit, so the maths is exact and only the display is rounded. It all runs in your browser, so nothing is sent anywhere and there is no limit on how many conversions you make.

Built by CodingEagles
  • Exact, standard factors
  • 100% free
  • No sign-up, no app
  • Instant as you type
  • Works offline after first load

Every unit at once

Each converter shows your value across the whole category, not just one pair, so you see the full picture.

No ads in the way

The converter is the first thing on the page, with no pop-ups or walls between you and the answer.

Works on any device

Runs in any modern browser on phone, tablet and desktop, with no app to install.