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Home > Informal conversion of common units

Informal conversion of common measuring units often needs to be done without calculator or computer. This article is an informal listing of some quick and dirty conversions between the system used in the United States and metric or SI units. When people say "a foot long" or "ten kilometers from here", they rarely mean ".3048 m" or "6.21571 miles".

These are all rough approximations; for more accurate information, see Conversion of units.


Length:
2.5 cm 1 inch (in)
3 cm 1 in (just over, round down conversion)
10 cm 4 in (just under, round up conversion)
30 cm 1 foot (ft)
1 m 3 ft
1 m 1 yard (just over)
200 m 1 furlong
1 km ½ mile (just over, round down conversions)
5 km 3 miles (just under, round up conversions)


Area:
4000 m² 1 acre
1 km² 250 acres
5 km² 2 square miles


Volume:
1 l 2 U.S. pints
½ l 1 U.S. pint
4 l 1 gallon (gal)
6 U.S. gallons 5 Imperial gallons
160 l 1 barrel


Mass:
30 g 1 ounce (oz.)
200 g 7 oz.
½ kg 1 pound (lb, in the U.S. it is also #)
1 kg 2 lb
50 kg 1 hundredweight (cwt)
1 t 1 ton


Velocity:
1 km/h 0.3 m/s 1 foot per second (ft/s)
2 km/h ½ m/s 1 knotManrope knot 3. Granny knot4. Rosebud stopper knot? 5. Mathew Walker knot6. Shroud knot 7. Turks head knot8. Stopper knots Overhand knot, Figure eight knot 9. Reef knot or Square knot 10. Two half hitches A knot is a method for fastening or securing linea
3 km/h 1 m/s 2 mile per hour (mph)


Force:
3 NThis article is about the SI unit of force. For other uses see Newton (disambiguation In physics, the newton (symbol: N) is the SI unit of force, named after Sir Isaac Newton in recognition of his work on classical mechanics. It was adopted by the General 20 poundalThe poundal is a non- SI unit of force; it is defined as 1 lb ft/s². 1 pdl 0. 138 254 954 376 N exactly Units of force Imperial units US customary units.
5 N 1 pound-forceThe pound-force is a non- SI unit of force or weight (properly abbreviated "lb" or "lbf"). The pound-force is equal to a mass of one pound multiplied by the standard acceleration of gravity (which is defined as exactly 9. 806 65 m/ s2, or exactly 196,133/ (lbf)


Pressure:
1 barSee BAR for various meanings of that acronym. Bar can refer to several different things: Bar (counter) the counter from which drinks are dispensed in a Bar (establishment) Bar (establishment) a retail establishment which serves alcoholic beverages (in Bri = 1 hPa 1 atm
4 bar = 4 hPa 3 torr = 3 mmHg
100 bar = 10 kPa 3 inch mercury


Energy, Heat:
4 J 1 calorie
1 kJ 1 British thermal unit


Power
3 kW 4 horsepower


Temperatures:



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Topics: Informal Conversion Of Common Units, Informal Economy...

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