Unit Converter

straighten Metric System

The Metric System (SI) is used by most countries worldwide. It's based on powers of ten, making conversions simple – just move the decimal point. For example, 1 kilometer = 1000 meters, 1 meter = 100 centimeters. It's the standard for science and medicine.

crop_square Imperial System

The Imperial System (also called US Customary Units) is primarily used in the United States. It includes feet, inches, pounds, and gallons. Conversions are less straightforward (e.g., 1 foot = 12 inches, 1 pound = 16 ounces). Our converter handles both systems with ease.

history A Brief History

The metric system was developed during the French Revolution (1790s) to create a universal, decimal‑based system. Imperial units evolved from older English units, with definitions often based on human body parts (e.g., foot). Today, even the US defines its units in relation to metric standards.

touch_app 1. Choose Category

Click on one of the category cards above: Length, Weight, Temperature, or Area. The converter will automatically update to show units from that category.

arrow_drop_down 2. Select Units

Pick the unit you want to convert from in the left dropdown, and the target unit in the right dropdown. The default "From" and "To" units are chosen for convenience.

edit 3. Enter Value

Type the number you wish to convert in the left input field. The result appears instantly on the right. You can also use the quick conversion buttons below for common values.

swap_horiz 4. Swap Units

Click the circular swap button to exchange the "From" and "To" units. This is handy when you want to reverse a conversion (e.g., feet to meters instead of meters to feet).

restaurant Cooking & Baking

Recipes often use different units: grams vs. ounces, milliliters vs. cups. Our converter helps you scale ingredients accurately. For example, 1 cup of flour is approximately 120 grams.

flight Travel

When traveling abroad, you'll encounter kilometers instead of miles, Celsius instead of Fahrenheit. Quickly convert distances, temperatures, and luggage weight limits.

science Science & Education

In labs and classrooms, measurements are often in metric. Convert between units for experiments, homework, or research papers. Precision matters – our converter uses exact factors.

construction Engineering & DIY

Building projects may mix imperial and metric (e.g., a 2x4 lumber size vs. metric screws). Convert lengths and areas to avoid costly mistakes.

fitness_center Fitness & Health

Track your weight in kilograms or pounds, distances in miles or kilometers. Convert your running pace or weight loss goals easily.

straighten Length

• cm → inches: divide by 2.5 (approx.)
• inches → cm: multiply by 2.5
• miles → km: multiply by 1.6
• km → miles: divide by 1.6
• feet → meters: divide by 3.28

scale Weight

• kg → lbs: multiply by 2.2
• lbs → kg: divide by 2.2
• grams → ounces: divide by 28.35
• ounces → grams: multiply by 28.35
• stone → kg: multiply by 6.35

thermostat Temperature

• °C → °F: double and add 30 (rough)
• °F → °C: subtract 30, then halve
• Exact: °F = °C × 9/5 + 32
• 0°C = 32°F, 100°C = 212°F

crop_square Area

• sq m → sq ft: multiply by 10.764
• sq ft → sq m: divide by 10.764
• acres → hectares: divide by 2.471
• hectares → acres: multiply by 2.471

straighten Length

• 1 km = 1000 m
• 1 m = 100 cm
• 1 cm = 10 mm
• 1 mile = 1609.34 m
• 1 yard = 0.9144 m
• 1 foot = 0.3048 m
• 1 inch = 0.0254 m

scale Weight

• 1 tonne = 1000 kg
• 1 kg = 1000 g
• 1 lb = 0.45359237 kg
• 1 oz = 28.349523125 g
• 1 stone = 6.35029318 kg

thermostat Temperature

• °F = °C × 9/5 + 32
• °C = (°F − 32) × 5/9
• K = °C + 273.15
• °C = K − 273.15

crop_square Area

• 1 km² = 1,000,000 m²
• 1 hectare = 10,000 m²
• 1 acre = 4046.8564224 m²
• 1 ft² = 0.09290304 m²
• 1 in² = 0.00064516 m²