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1 km =
0.621371
mi
Kilometers → Miles
1 km in all units
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Unit conversion involves multiplying or dividing by a conversion factor — the ratio between two units of the same physical quantity. The key is to multiply so that the original unit cancels and the target unit remains. Every conversion can be verified by checking units: if they cancel correctly, your formula is right.
Most-Used Conversions
Convert 25°C to Fahrenheit:
°F = (25 × 9/5) + 32 = (25 × 1.8) + 32 = 45 + 32 = 77°F. This is a comfortable warm day — 25°C is a common target for indoor climate control globally.
1 kilometer = 0.621371 miles. To convert km to miles: multiply by 0.621371. To convert miles to km: multiply by 1.60934. Quick mental math: multiply km by 0.6 for a rough estimate (accurate within 3%). Examples: 10 km = 6.21 miles; 26.2 miles (marathon) = 42.2 km; 100 km = 62.1 miles; 5 km race = 3.11 miles. The exact conversion factor is 1 mile = 1,609.344 meters = 1.609344 km, defined exactly in 1959 by international agreement.
Celsius to Fahrenheit: °F = (°C × 9/5) + 32. Fahrenheit to Celsius: °C = (°F – 32) × 5/9. Key reference points: 0°C = 32°F (water freezes); 20°C = 68°F (comfortable room temperature); 37°C = 98.6°F (normal body temperature); 100°C = 212°F (water boils). Quick mental trick: double the Celsius temperature and add 30 for a rough Fahrenheit estimate (works well for 10–30°C range). Example: 22°C → 22×2 + 30 = 74°F (exact is 71.6°F, close enough for daily use).
1 kilogram = 2.20462 pounds. To convert kg to lbs: multiply by 2.20462. To convert lbs to kg: divide by 2.20462 (or multiply by 0.453592). Quick mental math: multiply kg by 2.2. Examples: 70 kg = 154.3 lbs; 100 kg = 220.5 lbs; 180 lbs = 81.6 kg; 150 lbs = 68.0 kg. For kilograms to stones (used in the UK): 1 kg = 0.157473 stones; 1 stone = 6.35029 kg. 70 kg = 11 stone 0.3 lbs.
1 meter = 3.28084 feet = 3 feet 3.37 inches. 1 foot = 0.3048 meters. To convert height: take the meters value, multiply by 3.28084 to get total feet, take the decimal part × 12 to get inches. Example: 1.75 meters → 1.75 × 3.28084 = 5.741 feet → 5 feet + 0.741 × 12 = 5 feet 8.9 inches ≈ 5'9". Common reference heights: 5'0" = 1.524 m; 5'6" = 1.676 m; 6'0" = 1.829 m; 6'6" = 1.981 m.
1 US gallon = 3.78541 liters. To convert liters to US gallons: divide by 3.78541. To convert gallons to liters: multiply by 3.78541. Note: the UK (imperial) gallon is larger — 1 imperial gallon = 4.54609 liters. Common conversions: 1 liter ≈ 0.264 US gallons; 2 liters = 0.528 gallons; gas tank 60 liters = 15.9 US gallons. Fuel economy: 30 mpg (US) = 7.84 L/100km; 50 mpg (US) = 4.70 L/100km.
The metric (SI) system is a decimal system — all units are powers of 10. Distance: millimeter, centimeter, meter, kilometer (×1000 each). Weight: milligram, gram, kilogram, metric ton. Volume: milliliter, liter. The metric system is used by 195 of 196 countries. The imperial/US customary system uses arbitrary conversion factors: 12 inches per foot, 3 feet per yard, 1,760 yards per mile; 16 ounces per pound, 14 pounds per stone; 8 fluid ounces per cup, 2 cups per pint, 2 pints per quart, 4 quarts per gallon. Only the US, Myanmar, and Liberia do not primarily use metric.
1 square foot = 0.092903 square meters. 1 square meter = 10.7639 square feet. To convert sq ft to sq m: multiply by 0.0929. To convert sq m to sq ft: multiply by 10.764. Examples: 500 sq ft = 46.5 sq m; 1,000 sq ft = 92.9 sq m; 2,000 sq ft = 185.8 sq m. Common reference: a standard US parking space is about 162 sq ft (15 sq m); a typical US apartment is 850 sq ft (79 sq m); a typical 3-bedroom US home is 2,100 sq ft (195 sq m).
1 mph = 1.60934 km/h. To convert mph to km/h: multiply by 1.60934. To convert km/h to mph: divide by 1.60934 (or multiply by 0.621371). Quick estimate: multiply mph by 1.6. Examples: 60 mph = 96.6 km/h; 100 km/h = 62.1 mph; 70 mph (US freeway) = 112.7 km/h; 130 km/h (EU motorway limit) = 80.8 mph. Speed of light: 299,792 km/s = 186,282 miles/second. Sound at sea level: 343 m/s = 1,235 km/h = 767 mph.
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