5 kilometres in miles
Input Length, value 5, from km, to mi.
Result 5 × 1,000 ÷ 1,609.344 = 3.1069 mi, a factor of 0.621371 miles per kilometre.
Unit Converter
Study & MathConvert length, weight and temperature between metric and imperial units, with the exact factor used for every step.
Your inputs
Result
Converted value
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- Target unit —
- Conversion factor —
Change any input and the result updates instantly.
Formula and rules
- Length and weight: result = value × base factor of the from-unit ÷ base factor of the to-unit
- Length base is the metre: 1 km = 1,000 m, 1 cm = 0.01 m, 1 mm = 0.001 m, 1 in = 0.0254 m, 1 ft = 0.3048 m, 1 yd = 0.9144 m, 1 mi = 1,609.344 m
- Weight base is the kilogram: 1 g = 0.001 kg, 1 mg = 0.000001 kg, 1 lb = 0.45359237 kg, 1 oz = 0.028349523125 kg, 1 st = 6.35029318 kg, 1 t = 1,000 kg
- Temperature is a shifted scale, so it needs formulas rather than a single factor: °C = (°F − 32) × 5 ÷ 9, °C = K − 273.15, °F = °C × 9 ÷ 5 + 32, K = °C + 273.15
Worked examples
154 pounds in kilograms
Input Weight, value 154, from lb, to kg.
Result 154 × 0.45359237 = 69.8532 kg, so a pound is 0.453592 kilograms.
100 °F in Celsius
Input Temperature, value 100, from °F, to °C.
Result (100 − 32) × 5 ÷ 9 = 37.7778 °C, just under body temperature.
FAQ
Why does temperature not use a simple multiplication factor?
Celsius, Fahrenheit and Kelvin have different zero points, so each scale needs a shift as well as a scale. That is why 0 °C equals 32 °F and 273.15 K rather than 0 in either scale.
Are the inch and pound factors exact?
Yes. Since the 1959 international yard and pound agreement, 1 inch is exactly 0.0254 metres and 1 pound is exactly 0.45359237 kilograms. The displayed result is rounded to four decimals, so long values may drift in the last digit.
Can I convert area, volume or speed here?
This converter covers length, weight and temperature only. For area and volume tied to a project, use the concrete, flooring or soil calculators, which already handle both measurement systems.
Disclaimer: Results follow the formula shown on this page and are for reference only. Real-world quantities vary with materials, technique and conditions, so allow a margin before ordering.