Handy conversions to remember
- 1 inch = 2.54 cm · 1 foot = 30.48 cm · 1 mile = 1.609 km
- 1 kg = 2.2046 lb · 1 lb = 453.6 g · 1 troy ounce (gold) = 31.10 g
- °F = °C × 9/5 + 32 · °C = (°F − 32) × 5/9
- 1 feddan (Egypt) = 4,200.83 m² · 1 dunam = 1,000 m² · 1 acre = 4,046.86 m²
- 1 GB = 1,000,000,000 bytes, while 1 GiB = 1,073,741,824 bytes, which is why a 1 TB drive shows about 931 GiB.
Frequently asked questions
How many centimetres are in an inch?
Exactly 2.54 cm, by international definition since 1959.
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32: 37 °C × 1.8 + 32 = 98.6 °F.
Is a pound the same as a kilogram?
No. 1 kg = 2.2046 lb, so a pound is about 0.4536 kg.
Why does my 1 TB drive show 931 GB?
Manufacturers count 1 TB as 10¹² bytes; Windows divides by 1024³ (GiB) but labels it GB.