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°C - Celsius °K - Kelvin °F - Fahrenheit °R - Réaumur
°C - Celsius 1 °K - 273,16 0,555 x (°F - 32) 1,25 x °R
°K - Kelvin °C + 273,16 1 0.555 x (°F + 459,68) 1,25 x (°R + 218,53)
°F - Fahrenheit 1,8 x °C + 32 1,8 x °K - 459,68 1 2,25 x °R +
°R - Réaumur 0,8 x °C 0,8 x K - 218,53 0,444 x (°F - 32) 1
International heat units
Angstrom A
micron μm
millimeter mm
centimeter cm
meter m
kilometer km
inch in
foot ft
yard yd
mile mi
nautical mile
A 1 104 10 -7^10 -8^10 -10^10 -13^ 3,937x10-9^ 3,28x10-10^ 1,0936x 10-10^ 6,21x10-14^ 0,54x10-
μm 104 1 0,001 10 -4^10 -6^10 -9^ 3,937x10-5^ 3,28x10-6^ 1,0936x10-6^ 6,21x10-10^ 0,54x10-
mm 107 1000 1 0,1 0,001 10 -6^ 0,03937 3,28x10-3^ 1,0936x10-3^ 6,21x10-7^ 0,54x10-
cm 108 104 10 1 0,01 10 -5^ 0,3937 0,032808 1,0936x10-2^ 6,21x10-6^ 0,54x10-
m 1010 106 1000 100 1 0,001 39,37 3,2808 1,0936 6,21x10-4^ 0,54x10-
km 1013 109 106 105 1000 1 39370 3280,8 1093,6 0,621 0,
in 2,54x10^8 2,54x10^4 25,4 2,54 0,0254 2,54x10^5 1 0,0833 0,0278 1,577x10-5^ 1,37x10-
ft 3,048x10^9 3,048x10^5 304,8 30,48 0,3048 0,0003048 12 1 0,333 1,89x10-4^ 1,65x10-
yd 0,9144x10^10 0,9144x10^6 914,4 91,44 0,9144 0,9144x10-3^36 3 1 5,68x10-4^ 4,94x10-
mi 1,609x10^13 1,609x10^9 1,609x10^6 160934 1609,34 1,60934 63359,8 5279,9 1759,98 1 0,
nautical mile
1,852x10^13 1,852x10^9 1,852x10^6 1,852x10^5 1852 1,852 72913,24 6076,04 2025,35 1,15 1
Lenght units
cm 2 dm 2 m 2
ha hectare
sq in square feet
sq ft square feet
sq yd square yards
a are
ac acre
cm 2 1 0,01 10 -4^10 -8^ 0,155 0,0011 1,196x10-4^10 -6^ 2,471x10-
dm 2 100 1 0,01 10 -6^ 15,5 0,11 0,01196 10 -4^ 2,47x10-
m 2 104 100 1 10 -4^ 1550,4 10,764 1,196 10 -2^ 2,47x10-
ha 108 106 104 1 1,55x10^7 1,076x10^5 11960 100 2,
sq in 6,45 0,0645 6,45x10-4^ 6,45x10^8 1 6,943x10-3^ 7,71x10-4^ 6,45x10-6^ 1,593x10-
sq ft 929 9,29 0,0929 0,929x10-5^144 1 0,1111 9,29x10-4^ 0,229x10-
sq yd 8361 83,61 0,8361 8,361x10-5^1297 9 1 0,836x10-2^ 2,065x10-
a 106 104 100 10 -2^ 155x10^5 1,076x10^3 1,196x10^2 1 0,
ac 4,0468x10^7 404685 4046,85 0,404 6,277x10^6 43668 4842,6 40,468 1
Surface conversion units
cm 3 dm 3 m 3
l liter
cu in cubic inches
cu ft cubic feet
cu yd cubic yards
gal (liquid) US gallon
gal (liquid) UK gallon
bbl (dry) US barrel
cm 3 1 10 -3^10 -6^10 -3^ 0,061 3,531x10-5^ 1,308x10-5^ 2,642x10-4^ 2,2x10-4^ 8,648x10-
dm 3 103 1 10 -3^1 61,013 0,0353 0,00131 0,264 0,22 8,648x10-
m 3 106 103 1 103 61013 35.31 1.31 264,2 220 8,
l 103 1 10 -3^1 61,013 0,0353 0,00131 0,264 0,22 8,648x10-
cu in 16,39 0,01639 1,639x10-5^ 0,01639 1 5,787x10-4^ 2,147x10-5^ 0,0043 0,0036 1,417x10-
cu ft 28320 28,32 0,02832 28,32 1728 1 0,037 7,482 6,23 0,
cu yd 7,646x10^5 764,6 0,7646 764,6 46576,6 27 1 202 168,212 6,
gal US 3785,4 3,7854 3,7854x10-3^ 3,7854 232,56 0,134 4,95x10-3^1 0,8326 0,
gal UK 4546,1 4,5461 4,5461x10-3^ 4,5461 277,78 0,16 5,94x10-3^ 1,201 1 0,
bbl US 115628 115,628 0,11562 115,628 7054,81 4,082 0,1515 30,548 25,438 1
Capacity units
g gram
kg kilogram
t ton
gr grain
oz ounces
lb pounds
g 1 0.001 10 -6^ 15.432 0.035 0.
kg 1000 1 0.001 15432 35.27 2.
t 106 1000 1 1.15432x10^7 35273 2204.
gr 0.0648 0.648x10-4^ 0.648x10-7^1 0.00228 1.428x10-
oz 28.35 0.02835 0.2835x10-4^ 437.5 1 0.
lb 453.6 0.4536 0.4536x10-3^7000 16
Mass units
g/ml kg/m 3
lb/ft 3 (pcf) pound per cubic feet
lb/in 3 (pci) pound per cubic inch
g/ml 1 1000 62.5 0.
kg/m 3 0.001 1 0.0624 3.61x10-
lb/ft 3 (pcf) 0.016 16.018 1 5.78x10-
lb/in 3 (pci) 27.7 27700 1730 1
Specific mass units
N
newton kgf^ dina^
lb pound
N 1 0.102 105 0.
kgf 9.80665 1 9.80665x10^5 2.
dina 10 -5^ 1.02*10-6^1 2.248x10-
lb 4.448222 0.454 444822.2 1
Force units
Pa=N/m^2 Pascal MPa^ kPa^ Bar^ mmH^2 O^
at kgf/cm^2
atm 760 Torr
Torr mmHG
psi pounds/ sq. inch
pounds/ sq. foot
in H 2 O ft H 2 O in HG
Pa 1 10 -6^10 -3^10 -5^ 0.102 1.02x10-5^ 0.99x10-5^ 0.75x10-2^ 1.45x10-4^ 0.0209 4.015x10-3^ 3.344x10-4^ 2.95x10-
MPa^106 1 103 10 101971 10.19^ 9.87^7500 145.03^ 2.09x10^4 4.015x10^3 3.344x10^2
kPa^103 10 -3^1 10 -2^ 101.97^ 0.01^ 9.8x10-3^ 7.5^ 145.03x10-3^ 2.088x10^4 4.015^ 0.3344^ 0.
Bar 105 10 -1^102 1 1.02x10-4^ 1.02 0.99 750 14.5 2088.55 401.28 33.44 29.
mmH 20 9.81^ 9.81x10-6^ 9.81x10-3^ 9.81x10-5^1 10 -4^ 9.68x10-5^ 7.36x10-2^ 1.422x10-4^ 0.0205^ 0.03937^ 3.281x10-3^ 0.
at 9.81x10^4 9.81x10-2^ 98.1 0.981 104 1 0.97 735.5 14.22 2048.34 393.7 32.79 29.
atm 1.01x10^5 1.01x10-1^ 101.325 1.01325 1.033x10^4 1.033 1 760 14.699 2116.85 406.67 33.9 30
Torr mmHG 1.33x
(^2) 1.33x10-4 (^) 0.13334 1.33x10-3 (^) 13.6 1.36x10-3 (^) 1.32x10-3 (^1) 0.01934 2.786 0.535 0.0446 0.
psi 6895 6.895x10-3^ 6.8947 0.06895 7030 0.0703 0.06803 51.71 1 144 27.67 2.306 2.
pound/sq.ft 47.8802^ 4.788x10-5^ 4.788x10-2^ 4.788x10-4^ 48.819^ 4.882x10-4^ 4.724x10-4^ 0.359^ 0.00694^1 0.192^ 0.016^ 0.
in H 2 O 249.08 2.491x10-5^ 2.491x10-2^ 0.00249 25.40 0.00254 0.00246 1.869 0.0361 5.208 1 0.8333 0.
ft H 2 O 2990 2.988x10-3^ 0.29888 0.0299 304.8 0.0305 0.0295 22.43 0.4336 62.5 12 1 0.
in HG 3386.37 3.386x10-3^ 3.386 0.03386 345.32 0.03453 0.03342 25.4 0.49 70.726 13.59 1.131 1
Pressure units
foot/s foot/min mi/h m/s m/min km/h
node (intern.) kt
foot/s 1 60 0.6804 0.3048 12.288 1.09738 1.
foot/min 0.01667 1 0.0113 0.005 0.3048 0.0183 0.
mi/h 1.467 88 1 0.447 26.82 1.6093 0.
m/s 3.281 196.85 2.237 1 60 3.6 1.
m/min 0.0546 3.281 0.03728 0.01667 1 0.06 0.
km/h 0.9113 54.675 0.6214 0.2778 16.667 1 0.
node (int.) kt 1.6877^ 101.259^ 1.151^ 0.5144^ 30.864^ 1.8518^1
Velocity units
N/mm 2 N/cm 2 Pascal N/m 2
dina/cm 2 kgf/mm 2 kgf/cm 2 kgf/m^2
N/mm 2 1 100 10 6 107 0.102 10.2 10.2x10^4
N/cm 2 0.01 1 104 105 0.102x10-2^ 0.102 0.102x10^4
Pascal N/m 2
10 -6^10 -4^1 10 0.102x10-6^ 0.102x10-4^ 0.
dina/cm 2 10 -7^10 -5^ 0.1 1 0.102x10-7^ 0.102x10-5^ 0.
kgf/mm 2 9.81 981 9.81x10^6 9.81x10^7 1 100 10
kgf/cm 2 9.81x10-2^ 9.81 9.81x10^4 9.81x10^5 0.01 1 104
kgf/m 2 9.81x10-6^ 9.81x10-4^ 9.81 98.1 10 -6^10 -4^1
Normal and tangential tension units
1 Pascal second = Pa x s (Decapoise daP)
Poise P =
dina x s kgf x s / m 2 cm 2
Decapoise daP 1 10 0.
Poise P 10-1 1 0.
kgf x s / m 2 9.81 98.1 1
Dinamic viscosity units (η)
