Unit Converter.
Instant.
Accurate.
Free.
The fastest free unit converter online. Convert length, weight, temperature, volume, speed, area, time and data — in real time with the formula shown. No sign-up ever.
| From | To | Multiply by | Example |
|---|
The conversions people need every day.
From cooking to construction, travel to science — these are the unit conversions searched millions of times every month.
- 1 inch= 2.54 cm
- 1 foot= 30.48 cm
- 1 mile= 1.609 km
- 1 meter= 3.281 ft
- 1 yard= 0.9144 m
- 1 kg= 2.205 lbs
- 1 lb= 453.6 g
- 1 oz= 28.35 g
- 1 stone= 6.35 kg
- 1 ton= 907.2 kg
- 0°C= 32°F
- 100°C= 212°F
- 37°C= 98.6°F
- -40°C= -40°F
- 20°C= 68°F
- 1 liter= 0.264 gal
- 1 gallon= 3.785 L
- 1 cup= 236.6 mL
- 1 fl oz= 29.57 mL
- 1 pint= 473.2 mL
- 1 mph= 1.609 km/h
- 60 mph= 96.56 km/h
- 100 km/h= 62.14 mph
- 1 knot= 1.852 km/h
- 1 m/s= 3.6 km/h
- 1 GB= 1,024 MB
- 1 TB= 1,024 GB
- 1 MB= 1,024 KB
- 1 KB= 1,024 B
- 1 byte= 8 bits
Conversions for every situation.
Whether you’re traveling, cooking, studying, or building — unit conversions are a daily necessity for millions of people.
Travel
Convert miles to km, Fahrenheit to Celsius, and pounds to kg when traveling between countries with different measurement systems.
Cooking
Convert cups to ml, ounces to grams, and Fahrenheit oven temperatures to Celsius when following recipes from other countries.
School & Science
Convert metric to imperial for physics, chemistry, and math homework. See the formula every time so you learn while you convert.
Construction & DIY
Convert inches to cm, feet to meters, and square feet to square meters for building projects, flooring, and home improvement.
Fitness & Health
Convert kg to lbs for weight tracking, miles to km for running apps, and km/h to mph for treadmill settings.
Tech & Data
Convert GB to MB, KB to bytes, and bits to megabits when working with file sizes, storage, and internet speeds.
Driving & Navigation
Convert mph to km/h, miles to km, and fuel consumption between MPG and L/100km for international road trips.
Shopping
Convert clothing sizes, shoe sizes, and fabric lengths when shopping from international stores or comparing product specifications.
Why Unit Conversion is So Searched
The world uses two main measurement systems — the metric system (used by most of the world) and the imperial system (used primarily in the US, UK, and a few others). This divide creates billions of unit conversion searches every year as people cross between the two systems in travel, cooking, science, and shopping.
SnapHQ’s free unit converter covers all 8 major conversion categories with real-time results and the formula shown for every conversion — so you understand the math, not just the answer.
Metric vs Imperial — The Big Divide
The United States is one of only three countries in the world that hasn’t officially adopted the metric system — the others are Myanmar and Liberia. This means Americans constantly need to convert between miles and kilometers, pounds and kilograms, Fahrenheit and Celsius.
For the rest of the world traveling to or buying from the US, the same challenge applies in reverse. SnapHQ handles both directions instantly — just enter your value, pick your units, and get the result with the conversion formula explained.
✓ Swap units — convert in both directions with one click
✓ Formula displayed — understand the conversion, not just the answer
✓ Quick chips — try the most common conversions instantly
✓ Reference table — see all conversion factors at a glance
Frequently asked questions
Common unit conversion questions answered.
Convert any unit — free & instant.
8 categories. Real-time results. Formula shown. No sign-up.
Start Converting →What Is SnapHQ’s Free Unit Converter?
SnapHQ’s free unit converter converts between 100+ units across 8 categories — length, weight, temperature, volume, speed, area, time, and data. Results update instantly as you type. Swap the direction with one click. The conversion formula is shown for every calculation.
No sign-up. No ads blocking your results. Works on any device.
The 8 Conversion Categories
Length — millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, nautical miles. Covers everyday use (cm to inches, meters to feet) and specialized needs (nautical miles for marine navigation).
Weight — milligrams, grams, kilograms, metric tons, ounces, pounds, stones, US tons. Covers kitchen measurements, body weight, shipping, and industrial use.
Temperature — Celsius, Fahrenheit, and Kelvin. Includes the exact formulas (°C to °F: multiply by 9/5 then add 32).
Volume — milliliters, liters, fluid ounces, cups, pints, quarts, gallons (US and UK). Essential for cooking, baking, and fluid measurement.
Speed — kilometers per hour, miles per hour, meters per second, knots, feet per second. Covers road speed, aviation, marine, and scientific use.
Area — square millimeters, square centimeters, square meters, hectares, square kilometers, square inches, square feet, square yards, acres, square miles.
Time — seconds, minutes, hours, days, weeks, months, years. Useful for project planning, scheduling, and time zone calculations.
Data — bits, bytes, kilobytes, megabytes, gigabytes, terabytes, petabytes. Essential for understanding file sizes, storage capacity, and internet speeds.
Most Common Conversions
cm to inches: Divide centimeters by 2.54. 30 cm = 11.81 inches.
kg to lbs: Multiply kilograms by 2.20462. 70 kg = 154.32 lbs.
Celsius to Fahrenheit: Multiply °C by 9/5 then add 32. 25°C = 77°F.
miles to km: Multiply miles by 1.60934. 10 miles = 16.09 km.
liters to gallons: Divide liters by 3.785. 2 liters = 0.53 US gallons.
How to Use the Unit Converter
Select your conversion category from the 8 tabs at the top. Choose your starting unit from the left dropdown and your target unit from the right dropdown. Enter your value — the result appears instantly. Click the swap button (⇄) to reverse the conversion direction.
Who Uses This Tool?
Travelers — converting local measurements when visiting countries that use different systems. Speed limits in km/h when you’re used to mph. Temperatures in Celsius when you think in Fahrenheit. Clothing sizes, distances, weights.
Cooks and bakers — converting recipe measurements between metric and imperial. Cups to milliliters, ounces to grams, Fahrenheit to Celsius for oven temperatures.
Students — converting between measurement systems for science, math, and engineering coursework. Physics problems often require converting between SI units and imperial.
Fitness and health — body weight in kg vs lbs, running distances in miles vs km, swimming distances in meters vs yards.
Contractors and builders — converting between metric and imperial measurements for materials, plans, and specifications. Especially common when working with international suppliers or clients.
Developers and IT professionals — converting between data units — megabytes to gigabytes, bits to bytes — for storage calculations, bandwidth analysis, and API documentation.
E-commerce businesses — converting product dimensions and weights for international shipping labels and marketplace listings.
Why Unit Conversions Matter
The United States is one of only three countries in the world that hasn’t officially adopted the metric system (alongside Myanmar and Liberia). This creates constant friction in international trade, travel, science, and everyday life. Understanding both systems — and converting between them accurately — is a practical skill with real-world applications every day.
For cooking and baking, precision matters. A few grams off in a bread recipe can mean the difference between a perfect loaf and a dense brick. For fitness tracking, using the wrong unit system means your running app and your scale might show numbers in different systems. For shipping, incorrect weight and dimension conversions can mean wrong shipping rates and customs declarations.
Frequently Asked Questions
How many cm in an inch? Exactly 2.54 centimeters per inch. This is a defined standard — not an approximation.
How many kg in a pound? One pound = 0.453592 kg. One kg = 2.20462 pounds.
What is 180 cm in feet and inches? 180 cm ÷ 2.54 = 70.87 inches = 5 feet 10.87 inches (approximately 5’11”).
What is 37°C in Fahrenheit? 37°C = 98.6°F — normal human body temperature.
How many miles in a kilometer? 1 kilometer = 0.621371 miles. 1 mile = 1.60934 kilometers.
How many cups in a liter? Approximately 4.23 US cups per liter.
Free forever. No sign-up required. Built by SnapHQ for everyday conversions.