- Length conversion — feet, inches, cm, metres, miles, km
- Weight conversion — kg, pounds, grams, tola, maund
- Temperature conversion — Celsius, Fahrenheit, Kelvin
- Speed conversion — km/h, mph, m/s, knots
- Area conversion — Indian land units (bigha, guntha, acre, hectare)
- Data storage — bits, bytes, KB, MB, GB, TB
- Frequently asked questions
Length Conversion — Feet, Inches, cm, Metres, Miles, km
Length is the most commonly converted unit — from height in feet to cm, to road distances in miles vs km, to fabric measurements in yards. India officially uses the metric system (metres, centimetres, kilometres) but feet and inches remain widely used for personal height and construction measurements.
1 metre = 100 cm = 3.28084 feet = 39.3701 inches
1 km = 1000 m = 0.621371 miles · 1 mile = 1.60934 km
Height 5'7" = (5×30.48) + (7×2.54) = 152.4 + 17.78 = 170.18 cm
| From → To | Multiply By | Example |
|---|---|---|
| Feet → Centimetres | × 30.48 | 5 ft = 152.4 cm |
| Inches → Centimetres | × 2.54 | 6 in = 15.24 cm |
| Kilometres → Miles | × 0.621371 | 100 km = 62.14 miles |
| Miles → Kilometres | × 1.60934 | 60 miles = 96.56 km |
| Metres → Feet | × 3.28084 | 1.8 m = 5.91 ft |
| Nanometres → Metres | × 10⁻⁹ | Used in chip manufacturing (3nm, 5nm) |
Weight Conversion — kg, Pounds, Grams, Tola, Maund
Weight conversions are used daily — from body weight in kg vs pounds, to gold weight in tolas (the traditional Indian jewellery unit), to cooking measurements in grams and ounces. India uses kilograms officially, but the tola remains the dominant unit in the gold and silver jewellery trade.
1 tola = 11.6638 g · 10 tola = 116.638 g (standard gold bar in India)
1 troy oz (gold pricing) = 31.1035 g = 2.6667 tola
1 maund = 40 seer = 37.3242 kg (British Indian standard)
When buying gold in India, the price is quoted per 10 grams or per tola. 1 tola = 11.6638 grams, so the price per tola = price per 10g × 1.16638. Global gold price is quoted per troy ounce = 31.1035 grams = 2.6667 tolas — so to convert global gold price ($/oz) to Indian price (₹/10g), multiply by (exchange rate × 10 / 31.1035).
Temperature Conversion — Celsius, Fahrenheit, Kelvin
India uses Celsius for all official and daily temperature measurements. Fahrenheit is used in the USA and some older medical contexts. Kelvin is used in scientific work — 0 K (absolute zero) is the coldest possible temperature where all molecular motion stops.
°F to °C: C = (F − 32) × 5/9
°C to K: K = C + 273.15
K to °C: C = K − 273.15
Quick trick: double the °C and add 30 ≈ °F (rough estimate)
Speed Conversion — km/h, mph, m/s, Knots
Speed is measured in km/h on Indian roads, mph in the US and UK, m/s in scientific contexts, and knots for maritime and aviation. The speedometer on Indian vehicles shows km/h. Aircraft altitude is in feet internationally but cruise speed is in knots (1 knot = 1.852 km/h).
| Speed | km/h | mph | m/s | knots |
|---|---|---|---|---|
| City speed limit (India) | 50 km/h | 31.07 mph | 13.89 m/s | 27 kn |
| Highway speed limit | 100–120 km/h | 62–75 mph | 27.8–33.3 m/s | 54–65 kn |
| Commercial aircraft cruise | ~900 km/h | ~560 mph | ~250 m/s | ~486 kn |
| Speed of sound (sea level) | 1,235 km/h | 767 mph | 343 m/s | 667 kn |
Area Conversion — Indian Land Units (Bigha, Guntha, Acre, Hectare)
Land area measurement in India is particularly complex because traditional units (bigha, guntha, katha, cent) vary significantly by state. Always verify with local land records (RoR) as the bigha in UP is different from the bigha in Bengal or Rajasthan.
| Unit | Square Metres | Square Feet | Acres | State/Region |
|---|---|---|---|---|
| Bigha (Uttar Pradesh) | 2,529 m² | 27,225 sq ft | 0.625 acres | UP, Bihar |
| Bigha (West Bengal) | 1,337 m² | 14,400 sq ft | 0.33 acres | Bengal |
| Bigha (Rajasthan) | 1,618 m² | 17,424 sq ft | 0.40 acres | Rajasthan |
| Guntha / Gunta | 101.17 m² | 1,089 sq ft | 0.025 acres | Maharashtra, Karnataka |
| Cent | 40.47 m² | 435.6 sq ft | 0.01 acres | Tamil Nadu, Kerala |
| Katha (Bihar) | 126.45 m² | 1,361 sq ft | 0.031 acres | Bihar, Jharkhand |
| Acre (standard) | 4,046.86 m² | 43,560 sq ft | 1 acre | Universal |
| Hectare | 10,000 m² | 107,639 sq ft | 2.471 acres | Universal |
Data Storage — Bits, Bytes, KB, MB, GB, TB
Data storage units follow two different standards — binary (powers of 1,024 used by computers) and decimal (powers of 1,000 used by storage manufacturers). This is why a "1 TB" hard drive shows only ~931 GB when connected — the drive uses decimal (1,000 GB) but your computer measures binary (1,024³ bytes = 931 GB).
Decimal: 1 KB = 1,000 bytes · 1 MB = 1,000 KB · 1 GB = 1,000 MB · 1 TB = 1,000 GB
Internet speed: measured in bits per second (Mbps). 1 byte = 8 bits.
100 Mbps connection downloads at ~12.5 MB/s (megabytes per second)
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📅 May 2026 · Written by the ToolLoom Team · Reviewed for accuracy May 2026