B List of Conversion Factors

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To change​
To​
Multiply by​
acres​
hectares​
.4047​
acres​
square feet​
43,560​
acres​
square miles​
.001562​
atmospheres​
cms. of mercury​
76​
Btu/hour​
horsepower​
.0003930​
Btu​
kilowatt-hour​
.0002931​
Btu/hour​
watts​
.2931​
bushels​
cubic inches​
2150.4​
bushels (U.S.)​
hectoliters​
.3524​
centimeters​
inches​
.3937​
centimeters​
feet​
.03281​
cubic feet​
cubic meters​
.0283​
cubic meters​
cubic feet​
35.3145​
cubic meters​
cubic yards​
1.3079​
cubic yards​
cubic meters​
.7646​
degrees​
radians​
.01745​
dynes​
grams​
.00102​
fathoms​
feet​
6.0​
feet​
meters​
.3048​
feet​
miles (nautical)​
.0001645​
feet​
miles (statute)​
.0001894​
feet/second​
miles/hour​
.6818​
furlongs​
feet​
660.0​
furlongs​
miles​
.125​
gallons (U.S.)​
liters​
3.7853​
grains​
grams​
.0648​
grams​
grains​
15.4324​
grams​
ounces (avdp)​
.0353​
grams​
pounds​
.002205​
hectares​
acres​
2.4710​
hectoliters​
bushels (U.S.)​
2.8378​
horsepower​
watts​
745.7​
horsepower​
Btu/hour​
2,547​
hours​
days​
.04167​
inches​
millimeters​
25.4000​
inches​
centimeters​
2.5400​
kilograms​
pounds (avdp or troy)​
2.2046​
kilometers​
miles​
.6214​
kilowatt-hour​
Btu​
3412​
knots​
nautical miles/hour​
1.0​
knots​
statute miles/hour​
1.151​
liters​
gallons (U.S.)​
.2642​
liters​
pecks​
.1135​
liters​
pints (dry)​
1.8162​
liters​
pints (liquid)​
2.1134​
liters​
quarts (dry)​
.9081​
liters​
quarts (liquid)​
1.0567​
meters​
feet​
3.2808​
meters​
miles​
.0006214​
meters​
yards​
1.0936​
metric tons​
tons (long)​
.9842​
metric tons​
tons (short)​
1.1023​
miles​
kilometers​
1.6093​
miles​
feet​
5280​
miles (nautical)​
miles (statute)​
1.1516​
miles (statute)​
miles (nautical)​
.8684​
miles/hour​
feet/minute​
88​
millimeters​
inches​
.0394​
ounces (avdp)​
grams​
28.3495​
ounces​
pounds​
.0625​
ounces (troy)​
ounces (avdp)​
1.09714​
pecks​
liters​
8.8096​
pints (dry)​
liters​
.5506​
pints (liquid)​
liters​
.4732​
pounds (ap or troy)​
kilograms​
.3732​
pounds (avdp)​
kilograms​
.4536​
pounds​
ounces​
16​
quarts (dry)​
liters​
1.1012​
quarts (liquid)​
liters​
.9463​
radians​
degrees​
57.30​
rods​
meters​
5.029​
rods​
feet​
16.5​
square feet​
square meters​
.0929​
square kilometers​
square miles​
.3861​
square meters​
square feet​
10.7639​
square meters​
square yards​
1.1960​
square miles​
square kilometers​
2.5900​
square yards​
square meters​
.8361​
tons (long)​
metric tons​
1.016​
tons (short)​
metric tons​
.9072​
tons (long)​
pounds​
2240​
tons (short)​
pounds​
2000​
watts​
Btu/hour​
3.4121​
watts​
horsepower​
.001341​
yards​
meters​
.9144​
yards​
miles​
.0005682​
 

BvU

Science Advisor
Homework Helper
11,824
2,576
I sure wish Napoleon had conquered England and its colonies .... :rolleyes:
 

robphy

Science Advisor
Homework Helper
Insights Author
Gold Member
5,378
655
What this table really means:

Since
$$(1\rm\ acre)=(0.4047\rm\ hectares)$$
either take your quantity in acres
  • and multiply it by 1 written as [itex]1= \frac{(0.4047\rm\ hectares)}{(1\rm\ acre)}[/itex]
    as in $$(5 \rm\ acres)=(5 \rm\ acres)\left(\frac{(0.4047\rm\ hectares)}{(1\rm\ acre)}\right) =5 (0.4047\rm\ hectares)$$
  • or substitute [itex](0.4047\rm\ hectares)[/itex] everywhere you see [itex](\rm acre)[/itex]
    as in $$(5 \rm\ acres)=(5 \ (0.4047\rm\ hectares))=5 (0.4047\rm\ hectares)$$
    which is "multiplying by 0.4047 AND replacing 'acres' with 'hectares' "


The parentheses are useful to avoid the common pitfall involving squaring or cubing units.
  • [itex]1\rm\ cm^3{ \color{red}{ {\bf\Huge\ \neq\ }}} 1 \times 10^{-2}\ m^3 =\frac{1}{100} m^3[/itex]

  • [itex]1\rm\ cm^3{ \color{blue}{ {\bf\Huge\ =\ }}} 1\rm\ (cm)^3\ =\ 1\rm\ \left(1 \times 10^{-2}\ m\right) ^3=
    1 \times 10^{-6}\ m^3 =\frac{1}{1000000} m^3[/itex]
Note the unit is [itex] \rm (cm)[/itex], not [itex] \rm (c)[/itex].



my $0.02
 
32,598
8,470
I'm so glad that degrees/radians is the only one I need from that list (although I use 180/pi, no need to remember or look up a number), not counting the occasional homework question that uses exotic units.

I think it would make sense to sort the list by type of unit (e.g. all length conversions together). A conversion table can replace many individual entries.
 

sophiecentaur

Science Advisor
Gold Member
22,953
3,606
A conversion that's really not trivial would be mm into and out of Fractions of an Inch. So many US metal workers and stock suppliers still use fractions a an inch ( interspersed with "thou" or thousandths of an inch, for 'good measure').
As someone who didn't need Napoleon to convince me that a metric measurement system had a lot going for it, I find the continuing US attitude difficult to understand. (I have found that many of them are actually nice chaps, aamof)
 

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