Centimetres → Inches
70.8661in
180 cm = 70.8661 in
180 cm in every unit
How the Unit Converter Works
Length and weight: ratio scales
Every length is stored as a multiple of a metre and every weight as a multiple of a kilogram. Converting is then two steps: multiply into the base unit, divide into the target. Because all the units share a base, any pair converts directly and the relationships stay consistent — a foot is always exactly twelve inches, however you get there.
Temperature is different
Temperature is not a ratio scale, and treating it like one is the classic bug. 20°C is not twice as hot as 10°C, because zero on the Celsius scale is an arbitrary point rather than an absence of temperature. Celsius and Fahrenheit disagree about both where zero sits and how large a degree is, so conversion needs an offset as well as a scale factor: °F = °C × 9/5 + 32. This converter routes every temperature through Celsius so the offsets stay correct — including negatives, where −40°C and −40°F are the same temperature.
Absolute zero
Kelvin starts at absolute zero — -273.15°C — the point where there is no thermal energy left to remove. Nothing can be colder, so the converter refuses values below it rather than returning a negative Kelvin figure that cannot exist.
Very large and very small results
Conversions can span an enormous range: a millimetre is roughly 0.00000062 miles, which would round to zero at any normal number of decimal places. Results outside a readable range switch to exponential notation so the answer survives instead of being rounded away.
Frequently asked questions
How does unit conversion work?
For length and weight, every unit is defined as a fixed multiple of a base unit — metres and kilograms here. To convert, the value is multiplied into the base unit and then divided into the target, which is why any pair of units in a category can be converted directly.
Why is temperature converted differently?
Because temperature scales have offsets, not just different sizes of degree. Celsius and Fahrenheit disagree about both where zero sits and how big a degree is, so you cannot convert by multiplying alone: °F = °C × 9/5 + 32. This calculator converts every temperature via Celsius, which keeps the offsets correct.
What is the one temperature where Celsius and Fahrenheit agree?
−40. It is the single point where the two scales cross, so −40°C is exactly −40°F. It is a useful check on any temperature converter.
How many pounds are in a kilogram?
One kilogram is about 2.205 pounds, and one pound is about 0.454 kilograms. A stone is 14 pounds, so roughly 6.35 kilograms — a unit still commonly used for body weight in the UK and Ireland.
Why is the answer shown in exponential notation?
Because some conversions span an enormous range. A millimetre is about 0.00000062 miles, which would read as 0.00 at any sensible number of decimal places. Very large and very small results switch to exponential form so the answer is still meaningful rather than rounded away.
Is a US ton the same as a metric ton?
No. This converter uses the metric ton (tonne), which is exactly 1,000 kilograms, or about 2,205 pounds. A US short ton is 2,000 pounds — roughly 907 kilograms — so the two differ by about 10%.