Whether you are converting km to miles for a visa form, bigha to acres for a land deal, kg to pounds for a gym app, or Celsius to Fahrenheit for a recipe — unit conversion trips up millions of Indians daily. This guide covers every common conversion with formulas, quick tricks, and India-specific units that most international converters miss entirely.
India is officially metric — the metric system has been mandatory since 1957. Yet traditional units remain deeply embedded in everyday life, particularly in real estate (bigha, guntha, cent, ground), gold trade (tola), and cooking (cup, tablespoon). Meanwhile, Indian professionals increasingly deal with US and UK content, products, and recipes that use miles, pounds, Fahrenheit, and fluid ounces.
The most commonly needed conversions for Indian users — covering road distances, travel, height on forms, and construction measurements:
| From | To | Multiply by | Common Use in India |
|---|---|---|---|
| Kilometres | Miles | × 0.6214 | International driving distances, US road trips |
| Miles | Kilometres | × 1.6093 | Converting US speed limits, Apple Maps |
| Centimetres | Inches | × 0.3937 | Height on US visa forms |
| Inches | Centimetres | × 2.54 | Screen sizes, furniture dimensions |
| Metres | Feet | × 3.2808 | Room dimensions, ceiling height |
| Feet | Metres | × 0.3048 | Construction plans in international format |
Mental trick for miles to km: Multiply by 1.6, or use the Fibonacci sequence — 5 miles = 8 km, 8 miles = 13 km, 13 miles = 21 km. These are approximate but remarkably close because 1.618 (the golden ratio) is very close to 1.60934.
Height is commonly needed for medical forms, US/UK visa applications, and fitness apps. Here is a quick reference:
| Feet & Inches | Total Inches | Centimetres |
|---|---|---|
| 5′ 0″ | 60 inches | 152.4 cm |
| 5′ 2″ | 62 inches | 157.5 cm |
| 5′ 4″ | 64 inches | 162.6 cm |
| 5′ 6″ | 66 inches | 167.6 cm |
| 5′ 8″ | 68 inches | 172.7 cm |
| 5′ 10″ | 70 inches | 177.8 cm |
| 6′ 0″ | 72 inches | 182.9 cm |
Weight conversions are needed for airline baggage, medical forms, gym apps, and gold purchases. India's traditional unit tola is still widely used in the jewellery trade:
| From | To | Multiply by | Practical Context |
|---|---|---|---|
| Kilograms | Pounds | × 2.2046 | Airline check-in weight allowances |
| Pounds | Kilograms | × 0.4536 | US/UK recipes, weight on medical forms |
| Grams | Tola | × 0.08573 | Gold weight conversion |
| Tola | Grams | × 11.664 | Jeweller pricing per tola → per gram |
| Grams | Troy Ounces | × 0.03215 | International gold spot price |
| Kilograms | Metric Tonnes | ÷ 1,000 | Commodity trading, goods transport |
Tola trap: When a jeweller quotes gold at "₹X per tola," that is for 11.664 grams — not 10 grams. The per-gram price is the tola price ÷ 11.664. A gold rate of ₹90,000/tola = ₹7,715/gram. Always verify which unit the quote is in.
India uses Celsius for weather, medicine, and cooking. Fahrenheit appears in US content, older industrial equipment, and some imported appliances. Kelvin is used in science and physics.
| Celsius | Fahrenheit | Reference Point |
|---|---|---|
| 0°C | 32°F | Water freezes |
| 20°C | 68°F | Room temperature (comfortable) |
| 37°C | 98.6°F | Normal human body temperature |
| 40°C | 104°F | High fever threshold |
| 100°C | 212°F | Water boils at sea level |
| 180°C | 356°F | Common baking temperature |
| 200°C | 392°F | High-heat cooking / roasting |
Quick Celsius → Fahrenheit trick: Double the Celsius value, subtract 10% of that, then add 32. Example: 30°C → 60, subtract 6 = 54, add 32 = 86°F (actual: 86°F ✓). Fast enough for mental calculation.
Indian real estate uses a patchwork of traditional units that vary by state. This is the area where most online converters fail Indian users. Here are the most important area conversions:
| From | To Sq Ft | To Sq M | To Acres |
|---|---|---|---|
| 1 Acre | 43,560 sq ft | 4,046.9 sq m | 1.0 |
| 1 Hectare | 1,07,639 sq ft | 10,000 sq m | 2.471 |
| 1 Sq Metre | 10.764 sq ft | 1.0 | 0.000247 |
| 1 Sq Foot | 1.0 | 0.0929 sq m | 0.0000230 |
| 1 Bigha (UP) | 27,000 sq ft | 2,508 sq m | 0.625 |
| 1 Bigha (Rajasthan pucca) | 43,560 sq ft | 4,047 sq m | 1.0 |
| 1 Guntha | 1,089 sq ft | 101.2 sq m | 0.025 |
| 1 Cent | 435.6 sq ft | 40.47 sq m | 0.01 |
| 1 Ground (Tamil Nadu) | 2,400 sq ft | 222.97 sq m | 0.0551 |
Bigha varies enormously by state. A "bigha" in UP (0.625 acres) is very different from a "bigha" in Rajasthan (1 acre). Never assume a standard bigha size for land transactions. Always confirm the local definition with the state revenue department or a registered surveyor.
Cooking and liquid measurement conversions are the most common everyday need — especially when following US or UK recipes in an Indian kitchen:
| From | To | Value | Kitchen Context |
|---|---|---|---|
| 1 US Cup | Millilitres | 236.6 ml | Common in US recipes — not 250ml |
| 1 Tablespoon (US) | Millilitres | 14.79 ml | Approx 15 ml for practical purposes |
| 1 Teaspoon (US) | Millilitres | 4.93 ml | Approx 5 ml |
| 1 Fluid Ounce | Millilitres | 29.57 ml | US oz — UK fl oz is slightly different (28.41 ml) |
| 1 Litre | US Gallons | 0.2642 | Fuel economy conversion |
| 1 US Gallon | Litres | 3.785 | Engine displacement, US fuel pricing |
1 cup ≠ 250 ml in the US: The US standard cup is 236.6 ml — not 250 ml as commonly assumed. For baking (where precision matters), this difference adds up. A recipe calling for 2 cups means 473 ml, not 500 ml. For everyday cooking, the difference is negligible.
| From | To | Multiply by | Context |
|---|---|---|---|
| km/h | mph | × 0.6214 | Indian speed limits to US/UK understanding |
| mph | km/h | × 1.6093 | US car specs to Indian road context |
| m/s | km/h | × 3.6 | Physics problems, wind speed |
| knots | km/h | × 1.852 | Aviation, maritime |
| Unit | Bytes | Common Use |
|---|---|---|
| 1 Kilobyte (KB) | 1,024 bytes | Small text files, emails |
| 1 Megabyte (MB) | 1,048,576 bytes | Photos, short audio |
| 1 Gigabyte (GB) | 1,073,741,824 bytes | Mobile data plans, app sizes |
| 1 Terabyte (TB) | ~1 trillion bytes | Hard drives, cloud storage |
| Mistake | What Goes Wrong | Correct Approach |
|---|---|---|
| Assuming 1 cup = 250 ml | US recipes use 236.6 ml per cup — underfilling by 13 ml per cup | Use 237 ml per US cup; 250 ml is the metric cup used in Australia and Canada |
| Using a fixed bigha value | Bigha in UP (0.625 acres) ≠ bigha in Rajasthan (1 acre) — can mean 60% difference in land area | Always verify local definition; use state revenue department records |
| Confusing weight with mass | Kilograms are mass; pounds (in everyday use) are weight — but for everyday conversions they are treated equivalently on Earth | 1 kg = 2.2046 lb for all practical weighing purposes |
| Mixing UK and US fluid ounces | 1 US fl oz = 29.57 ml; 1 UK fl oz = 28.41 ml — 4% difference that adds up in recipes | Specify which fl oz; US fl oz is more common in online recipes |
| Forgetting tola ≠ 10 grams | Buying gold assuming "per tola" means "per 10 grams" — overpaying by 16.64% | 1 tola = 11.664 grams; divide jeweller's per-tola price by 11.664 to get per-gram rate |
ToolLoom builds free tools for Indian students, professionals, and creators. Our unit converter includes Indian-specific units (bigha, tola, guntha, cent, ground) that most international tools ignore. Found an error or want a unit added? Email us at contact@toolloom.in