Unit Converter
Convert length, weight, temperature, area, volume and speed — everyday units, instant results
Conversions people look up most often
A common reference height. Multiply feet by 30.48, add inches × 2.54.
Multiply kg by 2.205 for pounds. Used in gym tracking and health apps.
Normal body temperature. Quick mental math: double °C, subtract 10%, add 32.
Real estate in many countries still uses acres and square feet alongside the metric system.
Quick estimate: divide km by 1.6 for miles. Mumbai to Pune = 150 km ≈ 93 miles.
Fuel efficiency: multiply km/L by 2.35 to get approximate miles per gallon.
Why many countries still mix metric and imperial
Most countries officially use metric, but in daily life feet and inches still dominate height conversations, acres rule real estate listings, and pounds show up in recipes. This dual-system reality makes a converter essential — whether you're reading a property listing in square feet and need square metres for a mortgage application, or converting your height from cm to feet for a medical form.
Frequently Asked Questions
Which units does this converter support?
The converter covers six categories: Length (metre, km, mile, foot, inch, yard, cm, mm), Weight (kg, gram, pound, ounce, tonne, milligram), Temperature (Celsius, Fahrenheit, Kelvin), Area (sq metre, sq foot, acre, hectare, sq yard, sq km), Volume (litre, millilitre, US gallon, cup, tablespoon, teaspoon), and Speed (km/h, m/s, mph, knot).
How accurate are the conversions?
All conversions use internationally recognised SI factors with full floating-point precision. Results are displayed to 6 significant figures where applicable.
How does temperature conversion work?
Temperature conversions use the standard offset formulas: °C to °F = (°C × 9/5) + 32, °F to °C = (°F − 32) × 5/9, °C to K = °C + 273.15. All intermediate calculations use Kelvin as the base unit.
How do I convert between metric and imperial for everyday use?
Quick rules of thumb: 1 km ≈ 0.62 miles, 1 kg ≈ 2.2 pounds, 1 litre ≈ 0.26 US gallons, 1 inch = 2.54 cm exactly. For height, multiply feet by 30.48 and add inches times 2.54 to get centimetres.
Why do people still use both metric and imperial?
Many countries officially use metric but still rely on imperial units in everyday life — feet and inches for height, acres for land, and Fahrenheit for weather in some regions. Understanding both systems is practical for international communication and local conventions.
Key Terms
SI Units
The International System of Units — the modern metric system with base units including metre, kilogram, second, and kelvin.
Conversion Factor
The fixed ratio between two units. For example, 1 inch = 2.54 cm exactly, 1 mile = 1.60934 km.
Imperial System
A measurement system using feet, pounds, and gallons — primarily used in the United States. Most other countries officially use metric.