Unit Conversion Calculations
Length, mass, temperature and more — with the conversion factor shown, not hidden.
12 calculations published in this category.
Area
How To Convert Acres To Hectares
An acre and a hectare both describe land, and both are casually called about the size of a football pitch, which is exactly why they get confused. The conversion itself is a single exact multiplication: one acre is 0.40468564224 hectare, so five acres is 2.0234282112 hectares.
ha = acres x 0.40468564224
How To Convert Square Feet To Square Meters
Converting square feet to square metres is a single multiplication, but it is the one conversion where the most common mistake, using the linear factor once instead of squaring it, produces an answer that is wrong by a factor of 3.28.
m2 = sq ft x 0.09290304
Temperature
How To Convert Celsius To Fahrenheit
Two things are happening in the temperature conversion, and keeping them apart is the whole skill: one scales the size of a degree, the other moves where zero sits.
F = C x 9/5 + 32
How To Convert Celsius To Kelvin
Converting Celsius to kelvin looks almost too easy beside the Fahrenheit rule, and the reason is that only the zero point moves while the size of the degree stays exactly the same.
K = C + 273.15
Length
How To Convert Feet To Meters
Feet and metres are tied together by a fixed, exact number, so the whole task is one multiplication. Every difficulty that remains comes from how the original measurement was written down.
m = ft x 0.3048
How To Convert Inches To Centimeters
Inches to centimetres is the rare conversion where the factor is exact by definition rather than measured, so the whole skill reduces to applying it in the right direction and reporting no more precision than the measurement earned.
cm = in x 2.54
How To Convert Miles To Kilometers
Miles to kilometers is the one everyday conversion where the factor is exact rather than rounded for convenience, which means there is no excuse for a wrong digit and every real error comes from applying the right number in the wrong direction.
km = mi x 1.609344
Volume
Mass & Weight
How To Convert Kilograms To Pounds
Kilograms to pounds is a single multiplication by 2.2046226218487757. The only real decision is whether you use that exact factor or the familiar 2.2 shortcut, which quietly runs 0.3235835 lb high on 70 kg — about 147 g of avoidable error.
lb = kg x 2.2046226218487757
How To Convert Ounces To Grams
Ounces to grams is a single multiplication by an exact factor, and almost every mistake people make comes from confusing the mass ounce with the fluid ounce that shares its name.
g = oz x 28.349523125
How To Convert Pounds To Kilograms
Pounds to kilograms is one multiplication. The only real decision is whether you use the exact factor, or a mental shortcut that quietly overshoots by an amount that grows with every pound you add.
kg = lb x 0.45359237