What is the difference between metric and imperial?

Metric (SI) uses base-10 units — metres, kilograms, litres — and is the worldwide scientific standard. Imperial uses miles, pounds, gallons, and is mainly used in the US and a few other countries. This converter handles both.

How accurate are the conversions?

They use standard mathematical conversion factors with full floating-point precision. For everyday use — cooking, travel, DIY — the accuracy is more than sufficient.

Why are there two kinds of tons?

A metric ton (tonne) is 1 000 kg. A US (short) ton is about 907 kg. The converter treats them as separate units so you always get the right result.

Is temperature conversion linear?

Celsius ↔ Kelvin is a simple offset (K = °C + 273.15). Celsius ↔ Fahrenheit uses a multiplier and an offset: °F = (°C × 9/5) + 32. The converter handles both formulas automatically.

Unit Converter

Convert between metric and imperial units for length, weight, temperature, volume, area, time, and speed.

Select Category

From

Value to Convert

Quick Reference

• 1 kilometer = 1,000 meters

• 1 mile = 1.60934 kilometers

• 1 meter = 3.28084 feet

• 1 inch = 2.54 centimeters

Supported categories

Length

m, km, mi, ft, in

Weight

kg, lb, oz, g, t

Temperature

°C, °F, K

Volume

L, mL, gal, cups

Area

m², acre, ha, ft²

Time

s, min, hr, day, yr

Speed

m/s, km/h, mph, kt

How to use

1
Choose a category — Length, weight, temperature, volume, area, time, or speed.
2
Select units — Pick the 'from' unit in the first dropdown and the 'to' unit in the second.
3
Enter a value — Type the number you want to convert.
4
Read (or swap) — The converted result appears immediately. Tap the swap icon to reverse the direction.

Where people use this

Travel

Miles to km for road distances, Fahrenheit to Celsius for weather, pounds to kg for luggage limits.

Cooking

Cups to mL, ounces to grams, tablespoons to teaspoons — convert American recipes for metric kitchens and vice versa.

Construction & DIY

Feet to metres, square feet to square metres, inches to cm — keep blueprints and hardware specs aligned.

Science & school

Kelvin to Celsius, m/s to km/h, milligrams to grams — essential for lab reports and physics homework.

Frequently asked questions

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