Convert Units Online: Length, Weight, Temperature and More

A unit converter changes a measurement from one unit to another using exact standard factors — metres to feet, kilograms to pounds, Celsius to Fahrenheit and more — all in your browser with no manual math. Instead of hunting for a different converter per category, one tool covers everything. The Unit Converter spans eight categories, reverses direction with a swap button, and generates a table of common equivalents for whatever value you enter.

One converter for eight kinds of measurement

Everyday life mixes measurement systems constantly. A recipe uses grams while your scale reads ounces; a running app shows kilometres while a race is in miles; a hard drive is sold in GB while your operating system reports GiB. This tool keeps metric and imperial side by side across length, weight and mass, temperature, area, volume, speed, time and data storage, so you never leave the page to switch systems. It's built for cooks, travellers, students, engineers and anyone who works across borders.

How to convert units in your browser

1. Choose a category: length, weight, temperature, area, volume, speed, time or data storage.
2. Enter the value to convert and select its unit.
3. Select the target unit — the converted value appears instantly.
4. Use the swap button to reverse direction, and check the table of common equivalents below.

Handy conversions worth memorising

A few factors come up so often they're worth keeping in your head. Here are the exact ones the converter uses, with quick rules of thumb.

From	To	Exact factor	Rule of thumb
1 inch	cm	2.54	—
1 mile	km	1.609344	10 km ≈ 6.2 mi
1 kg	lb	2.20462	double it, add 10%
°C	°F	× 1.8 + 32	needs an offset

Temperature is the exception: it needs an added offset, not just a multiplier, which is why 0 °C maps to 32 °F rather than 0.

Key features

• Eight categories: length, weight, temperature, area, volume, speed, time and data
• Exact standard conversion factors, defined internationally
• One-click swap between the from and to units
• A common-conversions table generated for your value
• Both decimal (MB) and binary (MiB) data units supported
• 100% private, free and offline-capable

Try the Unit Converter now — it's free and runs entirely in your browser.

Frequently asked questions

How do I convert Celsius to Fahrenheit?

Multiply by 9/5 and add 32: °F = °C × 1.8 + 32. So 25 °C is 77 °F. To reverse it, subtract 32 then multiply by 5/9. Temperature is the one category needing an offset rather than a simple factor.

How many kilometres are in a mile?

One mile is exactly 1.609344 km, so 5 miles is about 8.05 km. Going the other way, 1 km is roughly 0.621 miles — a useful shortcut is that 10 km ≈ 6.2 miles.

How many pounds are in a kilogram?

One kilogram equals about 2.20462 pounds, defined exactly as 1 lb = 0.45359237 kg. So a 70 kg person weighs about 154.3 lbs, and a 10 lb parcel is roughly 4.54 kg.

What's the difference between MB and MiB?

MB is decimal — exactly 1,000,000 bytes — while MiB is binary, 1,048,576 bytes (1024²). Drive makers use MB and GB; operating systems often report MiB and GiB, which is why a "500 GB" drive shows as about 465 GiB.

Are the conversion factors exact?

The metric-imperial factors are exact by international definition: 1 inch = 2.54 cm, 1 pound = 0.45359237 kg, 1 mile = 1609.344 m. This converter uses those values, so any rounding you see is only in the displayed decimals.

Related free tools

• Area Calculator — area of common shapes in any unit
• Scientific Calculator — trig, logs and powers
• Binary Calculator — number bases and bitwise math
• BMI Calculator — Body Mass Index in metric or imperial

Built by ByteVancer

ByteTools is a free product of ByteVancer, a software and web development studio that builds web apps, SaaS platforms and custom software for businesses. If you need calculators, converters or a full product built for your business, explore ByteVancer's services and get in touch.