Watt-Hour Conversion Calculator

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What Is a Watt-Hour?

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Joe is the creator of Inch Calculator and has over 20 years of experience in engineering and construction. He holds several degrees and certifications.

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A watt-hour is a unit used to measure energy.

Watt-hours are usually abbreviated as Wh, although the formally adopted expression is W·h. The abbreviation W h is also sometimes used. For example, 1 watt-hour can be written as 1 Wh, 1 W·h, or 1 W h.

In formal expressions, the centered dot (·) or space is used to separate units used to indicate multiplication in an expression and to avoid conflicting prefixes being misinterpreted as a unit symbol.[1]

How Much Is a Watt-Hour?

The watt-hour is a measure of electrical energy equal to one watt of power over a one hour period.

How to Convert Watt-Hours

To convert watt-hours to another unit of energy, you need to multiply the value by a conversion factor. A conversion factor is a numerical value used to change the units of a measurement without changing the value.[2]

You can find the conversion factors for watt-hours in the conversion table below.

Then, multiply the energy measurement by the conversion factor to find the equivalent value in the desired unit of measurement.

watt-hours × conversion factor = result

You can also use a calculator, such as one of the converters below, for the conversion.

Watt-Hour Conversion Table

Common watt-hour values and equivalent imperial and metric energy measurements
watt-hours joules kilojoules megajoules gigajoules calories kilocalories megacalories kilowatt-hours megawatt-hours watt-seconds british thermal units million BTU therms quads electronvolts kiloelectronvolts megaelectronvolts
1 Wh 3,600 J 3.6 kJ 0.0036 MJ 0.0000036 GJ 860.42065 cal 0.860421 kcal 0.00086 Mcal 0.001 kWh 0.000001 MWh 3,600 Ws 3.412142 BTU 0.0000034121 MMBTU 0.000034121 0.0000000000000034121 22,469,000,000,000,000,786,432 eV 22,469,000,000,000,000,000 keV 22,469,000,000,000,000 MeV
2 Wh 7,200 J 7.2 kJ 0.0072 MJ 0.0000072 GJ 1,721 cal 1.720841 kcal 0.001721 Mcal 0.002 kWh 0.000002 MWh 7,200 Ws 6.824283 BTU 0.0000068243 MMBTU 0.000068243 0.0000000000000068243 44,939,000,000,000,003,407,872 eV 44,939,000,000,000,000,000 keV 44,939,000,000,000,000 MeV
3 Wh 10,800 J 10.8 kJ 0.0108 MJ 0.0000108 GJ 2,581 cal 2.581262 kcal 0.002581 Mcal 0.003 kWh 0.000003 MWh 10,800 Ws 10.236425 BTU 0.000010236 MMBTU 0.000102 0.000000000000010236 67,407,999,999,999,995,805,696 eV 67,408,000,000,000,000,000 keV 67,408,000,000,000,000 MeV
4 Wh 14,400 J 14.4 kJ 0.0144 MJ 0.0000144 GJ 3,442 cal 3.441683 kcal 0.003442 Mcal 0.004 kWh 0.000004 MWh 14,400 Ws 13.648567 BTU 0.000013649 MMBTU 0.000136 0.000000000000013649 89,878,000,000,000,006,815,744 eV 89,878,000,000,000,000,000 keV 89,878,000,000,000,000 MeV
5 Wh 18,000 J 18 kJ 0.018 MJ 0.000018 GJ 4,302 cal 4.302103 kcal 0.004302 Mcal 0.005 kWh 0.000005 MWh 18,000 Ws 17.060708 BTU 0.000017061 MMBTU 0.000171 0.000000000000017061 112,350,000,000,000,004,718,592 eV 112,350,000,000,000,000,000 keV 112,350,000,000,000,000 MeV
6 Wh 21,600 J 21.6 kJ 0.0216 MJ 0.0000216 GJ 5,163 cal 5.162524 kcal 0.005163 Mcal 0.006 kWh 0.000006 MWh 21,600 Ws 20.47285 BTU 0.000020473 MMBTU 0.000205 0.000000000000020473 134,819,999,999,999,998,951,424 eV 134,820,000,000,000,000,000 keV 134,820,000,000,000,000 MeV
7 Wh 25,200 J 25.2 kJ 0.0252 MJ 0.0000252 GJ 6,023 cal 6.022945 kcal 0.006023 Mcal 0.007 kWh 0.000007 MWh 25,200 Ws 23.884991 BTU 0.000023885 MMBTU 0.000239 0.000000000000023885 157,290,000,000,000,009,961,472 eV 157,290,000,000,000,000,000 keV 157,290,000,000,000,000 MeV
8 Wh 28,800 J 28.8 kJ 0.0288 MJ 0.0000288 GJ 6,883 cal 6.883365 kcal 0.006883 Mcal 0.008 kWh 0.000008 MWh 28,800 Ws 27.297133 BTU 0.000027297 MMBTU 0.000273 0.000000000000027297 179,759,999,999,999,987,417,088 eV 179,760,000,000,000,000,000 keV 179,760,000,000,000,000 MeV
9 Wh 32,400 J 32.4 kJ 0.0324 MJ 0.0000324 GJ 7,744 cal 7.743786 kcal 0.007744 Mcal 0.009 kWh 0.000009 MWh 32,400 Ws 30.709275 BTU 0.000030709 MMBTU 0.000307 0.000000000000030709 202,219,999,999,999,996,854,272 eV 202,220,000,000,000,000,000 keV 202,220,000,000,000,000 MeV
10 Wh 36,000 J 36 kJ 0.036 MJ 0.000036 GJ 8,604 cal 8.604207 kcal 0.008604 Mcal 0.01 kWh 0.00001 MWh 36,000 Ws 34.121416 BTU 0.000034121 MMBTU 0.000341 0.000000000000034121 224,690,000,000,000,007,864,320 eV 224,690,000,000,000,000,000 keV 224,690,000,000,000,000 MeV
11 Wh 39,600 J 39.6 kJ 0.0396 MJ 0.0000396 GJ 9,465 cal 9.464627 kcal 0.009465 Mcal 0.011 kWh 0.000011 MWh 39,600 Ws 37.533558 BTU 0.000037534 MMBTU 0.000375 0.000000000000037534 247,159,999,999,999,985,319,936 eV 247,160,000,000,000,000,000 keV 247,160,000,000,000,000 MeV
12 Wh 43,200 J 43.2 kJ 0.0432 MJ 0.0000432 GJ 10,325 cal 10.325048 kcal 0.010325 Mcal 0.012 kWh 0.000012 MWh 43,200 Ws 40.9457 BTU 0.000040946 MMBTU 0.000409 0.000000000000040946 269,629,999,999,999,996,329,984 eV 269,630,000,000,000,000,000 keV 269,630,000,000,000,000 MeV
13 Wh 46,800 J 46.8 kJ 0.0468 MJ 0.0000468 GJ 11,185 cal 11.185468 kcal 0.011185 Mcal 0.013 kWh 0.000013 MWh 46,800 Ws 44.357841 BTU 0.000044358 MMBTU 0.000444 0.000000000000044358 292,100,000,000,000,007,340,032 eV 292,100,000,000,000,000,000 keV 292,100,000,000,000,000 MeV
14 Wh 50,400 J 50.4 kJ 0.0504 MJ 0.0000504 GJ 12,046 cal 12.045889 kcal 0.012046 Mcal 0.014 kWh 0.000014 MWh 50,400 Ws 47.769983 BTU 0.00004777 MMBTU 0.000478 0.00000000000004777 314,569,999,999,999,984,795,648 eV 314,570,000,000,000,000,000 keV 314,570,000,000,000,000 MeV
15 Wh 54,000 J 54 kJ 0.054 MJ 0.000054 GJ 12,906 cal 12.90631 kcal 0.012906 Mcal 0.015 kWh 0.000015 MWh 54,000 Ws 51.182124 BTU 0.000051182 MMBTU 0.000512 0.000000000000051182 337,039,999,999,999,995,805,696 eV 337,040,000,000,000,000,000 keV 337,040,000,000,000,000 MeV
16 Wh 57,600 J 57.6 kJ 0.0576 MJ 0.0000576 GJ 13,767 cal 13.76673 kcal 0.013767 Mcal 0.016 kWh 0.000016 MWh 57,600 Ws 54.594266 BTU 0.000054594 MMBTU 0.000546 0.000000000000054594 359,510,000,000,000,006,815,744 eV 359,510,000,000,000,000,000 keV 359,510,000,000,000,000 MeV
17 Wh 61,200 J 61.2 kJ 0.0612 MJ 0.0000612 GJ 14,627 cal 14.627151 kcal 0.014627 Mcal 0.017 kWh 0.000017 MWh 61,200 Ws 58.006408 BTU 0.000058006 MMBTU 0.00058 0.000000000000058006 381,980,000,000,000,017,825,792 eV 381,980,000,000,000,000,000 keV 381,980,000,000,000,000 MeV
18 Wh 64,800 J 64.8 kJ 0.0648 MJ 0.0000648 GJ 15,488 cal 15.487572 kcal 0.015488 Mcal 0.018 kWh 0.000018 MWh 64,800 Ws 61.418549 BTU 0.000061419 MMBTU 0.000614 0.000000000000061419 404,450,000,000,000,028,835,840 eV 404,450,000,000,000,000,000 keV 404,450,000,000,000,000 MeV
19 Wh 68,400 J 68.4 kJ 0.0684 MJ 0.0000684 GJ 16,348 cal 16.347992 kcal 0.016348 Mcal 0.019 kWh 0.000019 MWh 68,400 Ws 64.830691 BTU 0.000064831 MMBTU 0.000648 0.000000000000064831 426,919,999,999,999,972,737,024 eV 426,920,000,000,000,000,000 keV 426,920,000,000,000,000 MeV
20 Wh 72,000 J 72 kJ 0.072 MJ 0.000072 GJ 17,208 cal 17.208413 kcal 0.017208 Mcal 0.02 kWh 0.00002 MWh 72,000 Ws 68.242833 BTU 0.000068243 MMBTU 0.000682 0.000000000000068243 449,389,999,999,999,983,747,072 eV 449,390,000,000,000,000,000 keV 449,390,000,000,000,000 MeV

Watt-Hour Conversion Calculators

You can also convert energy using one of our watt-hour converters below.

Joules
Calories
Watts x Time
Thermal Units
Electronvolts
Related Calculators

You might also find our other electrical calculators useful.

References

  1. Bureau International des Poids et Mesures, The International System of Units (SI), 9th edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf
  2. National Institute of Standards & Technology, Unit Conversion, https://www.nist.gov/pml/owm/metric-si/unit-conversion

Other Energy Units

Joules
Calories
Watts x Time
Thermal Units
Electronvolts