Unit Converter — FreeAll Tools

About This Tool

Unit Converter

Convert between hundreds of units across length, weight, temperature, speed, area, volume, and more.

Why Use This Tool?

Convert km to miles, kg to lbs, Celsius to Fahrenheit, and much more
Useful for students solving physics, chemistry, or math problems
Convert cooking measurements like cups, tablespoons, and grams
Used by engineers, scientists, and professionals working with global standards
Handle unit conversions in seconds without memorising formulas

Overview

Unit conversion is a universal need that spans every field from science and engineering to cooking, fitness, and international trade. Whether you are converting kilometres to miles for a road trip, kilograms to pounds for a nutrition label, square feet to square metres for a real estate listing, or Celsius to Fahrenheit for a recipe, our Universal Unit Converter has you covered. We support conversions across 15+ measurement categories including Length, Weight/Mass, Temperature, Area, Volume, Speed, Time, Digital Storage, Energy, Pressure, Angle, Frequency, Fuel Economy, and more. All conversions are calculated using precise conversion factors and update in real time as you type — no need to press a calculate button. This tool is invaluable for students solving physics problems, engineers working with international specifications, home cooks scaling international recipes, and anyone who regularly works across the metric and imperial unit systems.

How to Use

1

Select the Category

Choose the measurement type: Length, Weight, Temperature, Area, Volume, Speed, etc.
2

Choose the From Unit

Select the unit you are converting from (e.g., Kilometres, Kilograms, Celsius).
3

Enter Your Value

Type the number you want to convert. All equivalent values update instantly.
4

Read the Target Unit

Find your target unit (e.g., Miles, Pounds, Fahrenheit) in the results list and read the converted value.
5

Copy the Result

Click any result to copy its value to your clipboard for use in your document or calculation.

Frequently Asked Questions

How many metres are in a kilometre?

1 kilometre = 1,000 metres. Equivalently, 1 mile = 1.60934 kilometres, 1 foot = 0.3048 metres, 1 inch = 2.54 centimetres.

How do I convert Celsius to Fahrenheit?

°F = (°C × 9/5) + 32. Example: 30°C = (30 × 1.8) + 32 = 86°F. Our tool does this instantly — just type the Celsius value.

What is 1 acre in square metres or square feet?

1 acre = 4,047 square metres = 43,560 square feet = 4840 square yards.

How do I convert MB to GB?

1 GB = 1,024 MB (binary, IEC standard) or 1,000 MB (decimal, SI standard). Storage manufacturers use decimal (1,000 MB); operating systems use binary (1,024 MB).

What is the difference between mass and weight?

Mass (kg) is a measure of matter. Weight (N) is a force = mass × gravitational acceleration. In everyday use, we use "kg" for both, but scientifically they are different.