Unit Conversion Guide: Length, Weight, Temperature, and More

Unit Conversion Guide: Metric, Imperial, and Everything In Between

Unit conversion is one of the most practical everyday calculations — needed for cooking, travel, fitness, engineering, and international business. Understanding the relationships between measurement systems prevents costly mistakes and speeds up calculations.

Metric vs Imperial: The Global Split

The world uses two primary measurement systems. The metric system (SI — International System of Units) is used by 195 of the world's 197 countries including India, all of Europe, China, Japan, Australia, and Africa. The imperial or US customary system is used by only three countries: the United States, Myanmar, and Liberia. The UK officially uses metric but maintains imperial in some everyday contexts (road distances in miles, draught beer in pints).

For India: the metric system has been official since 1957. However, informal usage of imperial measurements persists in some industries — property is sometimes quoted in square feet, heights in feet and inches, and tyre sizes still use imperial.

Length Conversions

From

To

Multiply By

|---|---|---|

Inches	Centimetres	2.54
Centimetres	Inches	0.3937
Feet	Metres	0.3048
Metres	Feet	3.2808
Miles	Kilometres	1.6093
Kilometres	Miles	0.6214
Yards	Metres	0.9144
Nautical miles	Kilometres	1.852

Key reference points: 1 inch = exactly 2.54 cm (defined standard). A 6-foot person is 182.88 cm. A 100-metre sprint is 328 feet. 5 kilometres equals roughly 3.1 miles.

Weight and Mass Conversions

From

To

Multiply By

|---|---|---|

Kilograms	Pounds	2.2046
Pounds	Kilograms	0.4536
Grams	Ounces	0.0353
Ounces	Grams	28.3495
Tonnes (metric)	Kilograms	1000
Tons (US short)	Kilograms	907.18

Key reference points: A 70 kg person weighs 154.3 lbs. A 1 kg bag of rice is 2.2 lbs. 100 grams of almonds is 3.5 ounces.

Temperature Conversions

Celsius to Fahrenheit: F = (C times 1.8) + 32

Fahrenheit to Celsius: C = (F minus 32) divided by 1.8

Celsius to Kelvin: K = C + 273.15

Reference Point

Celsius

Fahrenheit

|---|---|---|

Water freezes	0°C	32°F
Body temperature	37°C	98.6°F
Room temperature	22°C	71.6°F
Water boils	100°C	212°F
Typical Indian summer	40°C	104°F
Oven moderate	180°C	356°F

Quick mental approximation: double the Celsius and add 30 to get approximate Fahrenheit (works within 5% for 0-100°C range).

Volume Conversions

From

To

Multiply By

|---|---|---|

Litres	US gallons	0.2642
US gallons	Litres	3.7854
Millilitres	Fluid ounces (US)	0.0338
Fluid ounces (US)	Millilitres	29.5735
Cups (US)	Millilitres	236.588
Tablespoons (US)	Millilitres	14.787
Teaspoons (US)	Millilitres	4.929

Cooking reference: 1 cup = 240 ml (approximately). 1 tablespoon = 15 ml. 1 teaspoon = 5 ml.

Area Conversions

From

To

Multiply By

|---|---|---|

Square metres	Square feet	10.7639
Square feet	Square metres	0.0929
Acres	Square metres	4046.86
Hectares	Acres	2.4711
Bigha (UP)	Square metres	2529
Bigha (Bengal)	Square metres	1337
Guntha	Square metres	101.17

Property note: Indian property is commonly quoted in square feet. 1,000 sq ft = 92.9 sq metres. A 2BHK in metro India is typically 800-1,200 sq ft (74-111 sq metres).

Speed Conversions

From

To

Multiply By

|---|---|---|

km/h	mph	0.6214
mph	km/h	1.6093
m/s	km/h	3.6
km/h	m/s	0.2778
Knots	km/h	1.852

Reference: Indian speed limits are 50 km/h in residential areas, 80 km/h on state highways, 120 km/h on expressways. 100 km/h = 62.1 mph.

Lazyblink Unit Converter Features

Lazyblink provides dedicated converters for all 12 measurement categories: Length, Weight, Temperature, Speed, Area, Volume, Pressure, Energy, Data Storage, Number Base, Angle, and Fuel Efficiency.

Each converter shows all unit values simultaneously — enter a value in any field and all others update automatically. No need to select a "from" and "to" — see the entire conversion table at once. Supports both metric and imperial for all measurement types, plus Indian traditional units for area measurements.