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Unit Converter

Everyday

Convert between 50+ units across 6 categories: length, weight, volume, temperature, speed, and area. Instant results with all conversions shown simultaneously.

Reviewed by the thecalcu.com team · Last updated July 13, 2026

Convert From

Result
3.28084
Foot (ft)
1 Metre (m)
All Length Conversions for 1 Metre (m)
Millimetre (mm)
1000
Centimetre (cm)
100
Kilometre (km)
0.001
Inch (in)
39.3701
Foot (ft)
3.28084
Yard (yd)
1.09361
Mile (mi)
0.000621371

What is a Units?

A Unit Converter translates measurements between different units within six categories, length, weight/mass, volume, temperature, speed, and area, covering 50+ units with instant, simultaneous results. Select a category, enter a value and the source unit, and every equivalent value in all other units within that category updates in real time. The Unit Converter is one of the highest-traffic tools in any calculator platform, because unit conversion is a genuinely universal need that cuts across cooking, construction, science, travel, and commerce.

India sits at a unique measurement crossroads. The legal system of measurement is the SI (metric) system, kilograms, metres, litres, Celsius. But daily life mixes metric with legacy imperial: property is quoted in square feet, road distances in kilometres, fuel economy in km/L, body weight in kilograms for urban users but in pounds for the fitness-aware. Import specifications arrive in inches and pounds; European product dimensions come in centimetres. Every Indian professional who deals with international standards, travel, cooking, or technical specifications needs a unit converter regularly.

The six categories in this converter cover the most common everyday needs. Length handles everything from millimetres (PCB component tolerances) to miles (US road distances). Weight covers pharmaceutical milligrams, cooking grams, and cargo tonnes. Volume handles kitchen teaspoons to fuel litres to industrial cubic metres. Temperature converts between Celsius, Fahrenheit, and Kelvin, essential for anyone using American recipes or appliances. Speed covers km/h (Indian road speeds), mph (UK/US), m/s (scientific), and knots (aviation). Area covers the full range from sq mm to hectare, including the sq ft and sq yd units most used in Indian property.

For land and property area calculations, the Square Footage Calculator computes area from room dimensions and provides the same unit conversions with shape-specific formulas. For weather feels-like temperatures, the Weather Calculator applies the full meteorological formulas rather than a simple unit conversion.

Why Use a Unit Converter?

All conversions at once. Instead of converting one-to-one, the Unit Converter shows all units in a category simultaneously, enter feet, see metres, yards, inches, and kilometres at the same time. No second lookup needed.

International recipe and product specs. American baking recipes in cups; European product dimensions in cm; Japanese electronics in mm, the Unit Converter bridges these immediately.

Property and construction. Indian construction quotes mix sq ft (floor area), cubic metres (concrete volume), kilograms (steel), and millimetres (tolerances). Having all conversions available in one place eliminates the mental switching cost.

Travel preparation. Converting mph signs to km/h comfort zones, Fahrenheit weather forecasts to Celsius intuition, or miles-per-gallon fuel economy to km/L is essential for anyone travelling outside India.

Who Should Use This Calculator?

Students and educators doing physics, chemistry, and math problems requiring unit conversions across metric and imperial systems.

Cooks and bakers following international recipes that use cups, ounces, and Fahrenheit instead of grams, ml, and Celsius.

Engineers and architects working with international clients or standards documents that mix metric and imperial specifications.

Travellers and expatriates navigating foreign unit systems, road speeds, weather forecasts, body weight at doctors, fuel prices per gallon.

E-commerce sellers and buyers dealing with package weights and dimensions for international shipping, where carriers use pounds and inches for US routes and kg and cm for European ones.

What Insights Does the Unit Converter Give You?

Primary Result shows the converted value in your selected "to" unit, displayed prominently so it is immediately readable.

All Conversions Grid shows the value converted to every other unit in the category simultaneously. Click any unit in the grid to make it the primary "to" unit.

Swap Button instantly swaps the from and to units, useful for quick two-way conversions without re-navigating.

Exponential notation is used automatically for very large or very small values (such as converting 1 metre to nanometres, or 1 gram to tonnes) so results are always readable without truncation.

How to use this Units calculator

  1. Select a Category, click one of the six category chips (Length, Weight, Volume, Temperature, Speed, Area) at the top.
  2. Select From Unit, choose the unit you are converting from in the dropdown.
  3. Enter Your Value, type the number to convert. The result updates instantly.
  4. Select To Unit, choose the target unit. The primary result updates. All other units show in the grid below.
  5. Click any grid unit to make it the primary "to" unit, or click Swap to reverse the conversion direction.

Formula & Methodology

All conversions (except temperature) use a base unit with multiplicative factors:

Length, base: metre (m)
mm × 0.001, cm × 0.01, m × 1, km × 1000, in × 0.0254, ft × 0.3048, yd × 0.9144, mi × 1609.344

Weight, base: kilogram (kg)
mg × 10⁻⁶, g × 0.001, kg × 1, t × 1000, oz × 0.028350, lb × 0.453592

Volume, base: litre (L)
ml × 0.001, L × 1, m³ × 1000, tsp × 0.004929, tbsp × 0.014787, fl oz × 0.029574, cup × 0.236588, pt × 0.473176, gal × 3.78541

Speed, base: metres per second (m/s)
m/s × 1, km/h ÷ 3.6, mph × 0.44704, knot × 0.514444

Area, base: square metre (m²)
mm² × 10⁻⁶, cm² × 0.0001, m² × 1, km² × 10⁶, sq in × 0.00064516, sq ft × 0.092903, sq yd × 0.836127, acre × 4046.86, ha × 10000

Temperature, three-step formula (not multiplicative):
- To Celsius: °F → (°F − 32) × 5/9; K → K − 273.15
- From Celsius: → °F: × 9/5 + 32; → K: + 273.15

Worked example: A Pune engineer is reviewing a US-sourced HVAC specification that lists duct dimensions in inches, airflow in cubic feet per minute (CFM), and operating temperature range in Fahrenheit.

- Duct width: 18 inches → 18 × 0.0254 = 0.457 m = 45.7 cm
- Airflow: 800 CFM → 800 cubic feet per minute. 1 cubic foot = 28.317 L → 800 × 28.317/1000 = 22.65 m³/min (or ÷ 60 = 0.378 m³/s)
- Operating temp: 40°F to 140°F → (40−32)×5/9 = 4.4°C to (140−32)×5/9 = 60°C

All three conversions resolved in seconds, with no lookup tables required.

Frequently Asked Questions

Multiply kilometres by 0.621371 to get miles. For example, 100 km = 100 × 0.621371 = 62.14 miles. To convert miles back to kilometres, multiply by 1.60934. The Unit Converter handles this and 50+ other conversions instantly, select Length, enter your value in km, and all equivalent lengths including miles, feet, yards, and nautical miles appear simultaneously.
Fahrenheit = (Celsius × 9/5) + 32. For example, 37°C (normal body temperature) = (37 × 1.8) + 32 = 98.6°F. To convert from Fahrenheit to Celsius: Celsius = (Fahrenheit − 32) × 5/9. The Unit Converter handles Celsius, Fahrenheit, and Kelvin simultaneously in Temperature mode, enter any value and all three scales update instantly.
1 kilogram = 1,000 grams. The metric weight system is decimal throughout: 1 kg = 1,000 g = 100,000 cg = 1,000,000 mg. For imperial: 1 kg = 2.20462 pounds = 35.274 ounces. The Unit Converter shows all weight conversions simultaneously, which is especially useful for recipes, medical dosages, or courier shipment weight limits.
Mass is the amount of matter in an object (kilograms, grams, pounds), which does not change regardless of location. Weight is the gravitational force acting on that mass (measured in Newtons), which changes with gravity. In everyday usage, 'weight' and 'mass' are used interchangeably, when you step on a scale and it reads 70 kg, that is technically your mass. The Unit Converter operates in mass units (kg, g, lb, oz) as used in daily life.
1 US gallon = 3.78541 litres. Note there are two types of gallons: the US gallon (3.785 L) and the Imperial gallon used in the UK and some Commonwealth countries (4.546 L). Fuel economy figures from American cars use US MPG (miles per US gallon); Indian fuel consumption is measured in km/L. The Unit Converter uses US gallons by default, consistent with the US volume standards.
1 square foot = 0.092903 square metres; 1 square metre = 10.7639 square feet. Select Area in the Unit Converter, choose sq ft as the from-unit, enter the floor area, and instantly see sq m, sq yd, acres, and hectares. For RERA-compliant property comparisons in India, converting from the developer's sq ft figure to sq m is common when comparing with international or government-specification properties.
A knot is one nautical mile per hour (1 nautical mile = 1,852 metres). 1 knot = 1.852 km/h = 1.151 mph. Knots are used in aviation and maritime navigation. Wind speeds in weather reports are often given in knots internationally. In the Unit Converter, select Speed and you can convert between m/s, km/h, mph, and knots simultaneously.
1 tablespoon = 3 teaspoons. 1 US cup = 16 tablespoons = 48 teaspoons = 236.6 ml. Indian recipes increasingly use cup measurements, while traditional recipes use ml or grams. The Volume mode of the Unit Converter covers ml, L, tsp, tbsp, fl oz, cup, pint, and US gallon, useful for scaling Indian recipes that mix metric and US volume measures.
A hectare is 10,000 square metres (100m × 100m). 1 acre = 0.404686 hectares; 1 hectare = 2.47105 acres. Land in India is measured in acres, bighas, and guntas (which vary by state) as well as hectares in government records. The Unit Converter's Area mode handles sq mm, sq cm, sq m, sq km, sq in, sq ft, sq yd, acres, and hectares, useful for agricultural and land registration conversions.
All speed conversions go through metres per second (m/s) as the base unit. km/h to m/s: divide by 3.6. mph to m/s: multiply by 0.44704. Knots to m/s: multiply by 0.514444. The reverse conversions multiply instead of divide by the same factors. The Unit Converter applies these factors automatically, just enter your value and all four speed units update instantly.
The Unit Converter covers the standard international area units (sq ft, sq m, sq yd, acre, hectare) but does not include Indian traditional units like bigha, gunta, cent, or marla, as these vary significantly by state (a Bihar bigha is different from a UP bigha). For those conversions, check state revenue department records for the applicable local factor, then use the [Square Footage Calculator](/square-footage-calculator/) or Area mode in the Unit Converter to bridge from the converted value to your needed unit.
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