Convert Joule to Watt-hour using the exact conversion factor. This page provides the formula, reference values, and practical context for engineering, technical calculations, and professional measurement use.
Joule (J) = Watt-hour (Wh) × 0.000278
To convert Joule (J) to Watt-hour (Wh), multiply the value by 0.000278. The conversion factor is based on standardized unit definitions and is suitable for engineering analysis, system design, and professional measurement workflows.
Convert 1 J to Wh.
So, 1 J = 0.000278 Wh.
One Joule (J) equals 0.000278 Watt-hour (Wh)
Units of energy are standardized measurements used to quantify work, heat transfer, and energy consumption in mechanical, electrical, and thermal systems.
One Watt-hour (Wh) equals 0.000278 Joule (J)
Units of energy are standardized measurements used to quantify work, heat transfer, and energy consumption in mechanical, electrical, and thermal systems.
How many Watt-hour (Wh) are in 1 Joule (J)?
1 Joule (J) = 0.000278 Watt-hour (Wh).
How many Watt-hour (Wh) are in one Joule (J)?
One Joule (J) equals 0.000278 Watt-hour (Wh).
How many Wh are in one J?
One J equals 0.000278 Wh.
What is the formula for converting Joule (J) to Watt-hour (Wh)?
Multiply the Joule (J) value by 0.000278.
Can I reverse the conversion?
Yes. 1 Watt-hour (Wh) = 3600 Joules (J).
Is this Joule (J) to Watt-hour (Wh) conversion accurate for engineering use?
Yes. The conversion uses a standardized conversion factor suitable for engineering calculations, technical analysis, and professional reference.
Can this conversion be used for scientific or technical calculations?
Yes. This conversion is appropriate for scientific analysis, engineering calculations, simulations, and technical documentation where unit consistency is required.
By applying the conversion factor shown above, you can convert Joule (J) to Watt-hour (Wh) for power generation analysis, consumption tracking, and energy system planning.
1 J = 0.001 kJ
1 Joule (J) = 0.001 Kilojoule (kJ)
One Joule (J) equals 0.001 Kilojoule (kJ)
1 J = 10⁻⁶ MJ
1 Joule (J) = 10⁻⁶ Megajoule (MJ)
One Joule (J) equals 10⁻⁶ Megajoule (MJ)
1 J = 10⁻⁹ GJ
1 Joule (J) = 10⁻⁹ Gigajoule (GJ)
One Joule (J) equals 10⁻⁹ Gigajoule (GJ)
1 J = 0.00028 Wh
1 Joule (J) = 0.00028 Watt-hour (Wh)
One Joule (J) equals 0.00028 Watt-hour (Wh)
1 J = 2.77778 × 10⁻⁷ kWh
1 Joule (J) = 2.77778 × 10⁻⁷ Kilowatt-hour (kWh)
One Joule (J) equals 2.77778 × 10⁻⁷ Kilowatt-hour (kWh)
1 J = 2.77778 × 10⁻¹⁰ MWh
1 Joule (J) = 2.77778 × 10⁻¹⁰ Megawatt-hour (MWh)
One Joule (J) equals 2.77778 × 10⁻¹⁰ Megawatt-hour (MWh)
1 J = 0.23901 cal
1 Joule (J) = 0.23901 Calorie (cal)
One Joule (J) equals 0.23901 Calorie (cal)
1 J = 0.00024 kcal
1 Joule (J) = 0.00024 Kilocalorie (kcal)
One Joule (J) equals 0.00024 Kilocalorie (kcal)
1 J = 0.00095 BTU
1 Joule (J) = 0.00095 British Thermal Unit (BTU)
One Joule (J) equals 0.00095 British Thermal Unit (BTU)
1 J = 0.73756 ft_lbf
1 Joule (J) = 0.73756 Foot-pound force (ft⋅lbf)
One Joule (J) equals 0.73756 Foot-pound force (ft⋅lbf)
1 J = 3.72506 × 10⁻⁷ hp_h
1 Joule (J) = 3.72506 × 10⁻⁷ Horsepower-hour (hp⋅h)
One Joule (J) equals 3.72506 × 10⁻⁷ Horsepower-hour (hp⋅h)
1 J = 9.47813 × 10⁻⁹ therm_us
1 Joule (J) = 9.47813 × 10⁻⁹ Therm (US)
One Joule (J) equals 9.47813 × 10⁻⁹ Therm (US)
1 J = 6.24151 × 10¹⁸ eV
1 Joule (J) = 6.24151 × 10¹⁸ Electronvolts (eV)
One Joule (J) equals 6.24151 × 10¹⁸ Electronvolts (eV)
1 J = 6.24151 × 10¹⁵ keV
1 Joule (J) = 6.24151 × 10¹⁵ Kiloelectronvolts (keV)
One Joule (J) equals 6.24151 × 10¹⁵ Kiloelectronvolts (keV)
1 J = 6.24151 × 10¹² MeV
1 Joule (J) = 6.24151 × 10¹² Megaelectronvolts (MeV)
One Joule (J) equals 6.24151 × 10¹² Megaelectronvolts (MeV)
1 J = 6.24151 × 10⁹ GeV
1 Joule (J) = 6.24151 × 10⁹ Gigaelectronvolts (GeV)
One Joule (J) equals 6.24151 × 10⁹ Gigaelectronvolts (GeV)
1 J = 2.38846 × 10⁻¹¹ toe
1 Joule (J) = 2.38846 × 10⁻¹¹ Tonne of Oil Equivalent (toe)
One Joule (J) equals 2.38846 × 10⁻¹¹ Tonne of Oil Equivalent (toe)
1 J = 3.41208 × 10⁻¹¹ tce
1 Joule (J) = 3.41208 × 10⁻¹¹ Tonne of Coal Equivalent (tce)
One Joule (J) equals 3.41208 × 10⁻¹¹ Tonne of Coal Equivalent (tce)
1 J = 2.29371 × 10¹⁷ hartree
1 Joule (J) = 2.29371 × 10¹⁷ Hartrees
One Joule (J) equals 2.29371 × 10¹⁷ Hartrees