Joules to Watt Hours (J → Wh)
Formula
1 J = 0.0002777777777777778 WhConversion Table
| J | Wh |
|---|---|
| 0 | 0 |
| 1.0000 | 0.00027778 |
| 2.0000 | 0.00055556 |
| 3.0000 | 0.00083333 |
| 4.0000 | 0.0011111 |
| 5.0000 | 0.0013889 |
| 6.0000 | 0.0016667 |
| 7.0000 | 0.0019444 |
| 8.0000 | 0.0022222 |
| 9.0000 | 0.0025000 |
| 10.000 | 0.0027778 |
| 11.000 | 0.0030556 |
| 12.000 | 0.0033333 |
| 13.000 | 0.0036111 |
| 14.000 | 0.0038889 |
| 15.000 | 0.0041667 |
| 16.000 | 0.0044444 |
| 17.000 | 0.0047222 |
| 18.000 | 0.0050000 |
| 19.000 | 0.0052778 |
| J | Wh |
|---|---|
| 20.000 | 0.0055556 |
| 21.000 | 0.0058333 |
| 22.000 | 0.0061111 |
| 23.000 | 0.0063889 |
| 24.000 | 0.0066667 |
| 25.000 | 0.0069444 |
| 26.000 | 0.0072222 |
| 27.000 | 0.0075000 |
| 28.000 | 0.0077778 |
| 29.000 | 0.0080556 |
| 30.000 | 0.0083333 |
| 31.000 | 0.0086111 |
| 32.000 | 0.0088889 |
| 33.000 | 0.0091667 |
| 34.000 | 0.0094444 |
| 35.000 | 0.0097222 |
| 36.000 | 0.010000 |
| 37.000 | 0.010278 |
| 38.000 | 0.010556 |
| 39.000 | 0.010833 |
| J | Wh |
|---|---|
| 40.000 | 0.011111 |
| 41.000 | 0.011389 |
| 42.000 | 0.011667 |
| 43.000 | 0.011944 |
| 44.000 | 0.012222 |
| 45.000 | 0.012500 |
| 46.000 | 0.012778 |
| 47.000 | 0.013056 |
| 48.000 | 0.013333 |
| 49.000 | 0.013611 |
| 50.000 | 0.013889 |
| 51.000 | 0.014167 |
| 52.000 | 0.014444 |
| 53.000 | 0.014722 |
| 54.000 | 0.015000 |
| 55.000 | 0.015278 |
| 56.000 | 0.015556 |
| 57.000 | 0.015833 |
| 58.000 | 0.016111 |
| 59.000 | 0.016389 |
| J | Wh |
|---|---|
| 60.000 | 0.016667 |
| 61.000 | 0.016944 |
| 62.000 | 0.017222 |
| 63.000 | 0.017500 |
| 64.000 | 0.017778 |
| 65.000 | 0.018056 |
| 66.000 | 0.018333 |
| 67.000 | 0.018611 |
| 68.000 | 0.018889 |
| 69.000 | 0.019167 |
| 70.000 | 0.019444 |
| 71.000 | 0.019722 |
| 72.000 | 0.020000 |
| 73.000 | 0.020278 |
| 74.000 | 0.020556 |
| 75.000 | 0.020833 |
| 76.000 | 0.021111 |
| 77.000 | 0.021389 |
| 78.000 | 0.021667 |
| 79.000 | 0.021944 |
Joules to Watt Hours Conversion
Converting Joules (J) to Watt Hours (Wh) is a common energy and power conversion. 1 J equals 0.000278 Wh. For example, 100 J is equal to 0.027778 Wh.
Quick Mental Math: Joules to Watt Hours
3,600 joules is 1 watt-hour, so 7,200 joules is 2 watt-hours.
Why is converting Joules to Watt Hours tricky?
joules to watt hours uses an awkward ratio, so people often round too early or move the decimal the wrong way.
Quick Reference Values
1 J = 0.000278 Wh. 5 J = 0.001389 Wh. 10 J = 0.002778 Wh. 25 J = 0.006944 Wh. 50 J = 0.013889 Wh. 100 J = 0.027778 Wh.
What is Joules?
Joules (J) is a unit of energy and power. The joule is the SI unit of energy defined as the work done when a force of one newton moves an object one meter in the direction of the force. It equals one kilogram meter squared per second squared (kg·m²/s²). This definition aligns with the International System of Units as standardized by the BIPM [bipm-si-brochure]. The joule is named after James Prescott Joule, a 19th-century physicist who studied energy conservation. It was officially adopted as a unit of energy by the CGPM in 1948 to unify energy measurement standards internationally [cgpm-resolutions]. Joules are used worldwide in physics, engineering, and electrical industries to quantify energy, work, and heat. Countries using the SI system, including those in Europe, Asia, and the Americas, rely on joules for scientific and industrial applications [nist-si-guide].
What is Watt Hours?
Watt Hours (Wh) is a unit of energy and power. A watt-hour (Wh) measures energy equivalent to one watt of power expended for one hour. It equals 3600 joules in SI derived units, where 1 Wh = 1 W × 3600 s. Watt-hours quantify electrical energy consumption and storage in batteries and utility meters [nist-si-guide]. The watt-hour emerged with the widespread use of electric power in the late 19th century. It was standardized as an energy unit by electrical engineers and later formalized within the International System of Units framework [bipm-si-brochure]. Utility companies worldwide bill electricity in kilowatt-hours, a multiple of watt-hours. The unit is critical for residential, commercial, and industrial energy monitoring and renewable energy systems across all continents [nist-si-guide].
Common Misspellings
People often search for this conversion using these alternate spellings: joule, joul, jouls, juls, watt hours, watt-hour, watt hour, watthours. All of these refer to the Joules to Watt Hours conversion.