1 kilojoules to kilowatt-hours
1 kilojoules equals 0.000278 kilowatt-hours. Conversion formula, quick reference table and FAQs for kJ to kWh.
Calculation：1 × 0.000278 = 0.000278
Convert kJ to kWh in three steps
- 1. Take the conversion factor: 1 kJ = 0.000278 kWh.
- 2. Multiply your value by the factor: 1 × 0.000278.
- 3. Read the result: 1 kJ = 0.000278 kWh, then round to your needed precision.
Conversion formula: kJ to kWh
Reverse: 1 kWh = 3,600 kJ · see kwh-to-kj
kJ → kWh quick reference
kJ to kWh: common values at a glance
- · 2 kJ = 0.000556 kWh.
- · 5 kJ = 0.001389 kWh.
- · 10 kJ = 0.002778 kWh.
- · 20 kJ = 0.005556 kWh.
- · 25 kJ = 0.006944 kWh.
When do you need kJ → kWh?
Food labels in kJ, fitness in kcal, electricity in kWh, air conditioning in BTU — energy units link diet and bills. For example: a 330 ml cola has about 591 kJ ≈ 141 kcal; 1 kWh = 3,600 kJ; a 30-minute run burns roughly 300 kcal.
Where do kJ and kWh come from?
SI anchors to the joule. The kilocalorie = 4.184 kJ (from water-heating experiments); 1 kWh = 3.6 MJ is power × time; the BTU (1,055 J) persists in HVAC.
FAQs
▸How many kilowatt-hours is 1 kilojoules?
1 kilojoules equals 0.000278 kilowatt-hours. Calculated as 1 × 0.000278 = 0.000278.
▸What is the formula to convert kilojoules to kilowatt-hours?
1 kJ = 0.000278 kWh, so kWh = kJ × 0.000278
▸Is there a quick way to estimate kJ to kWh?
1 kcal = 4.184 kJ; 1 kWh = 3,600 kJ. Food-label "Calories" are actually kcal.
▸Where can I convert other values?
Open the full kilojoules converter and enter any value: the tool supports bidirectional conversion between kJ and kWh with all related units.
▸Why does the result contain decimals? How is rounding handled?
Because kJ and kWh belong to different unit systems, the ratio is rarely a round number — results are shown to 6 significant figures and rounded for readability. For engineering or medical use, keep at least 2 decimal places and verify with the tool above.
▸Where do the kJ and kWh definitions come from?
Both units trace back to international standard definitions — imperial units were fixed against metric by the 1959 international yard-and-pound agreement, and metric units are maintained by the BIPM. The factors used on this page match those standards.
▸How do I convert kWh back to kJ?
Use the inverse operation: for linear conversions divide by the factor instead of multiplying (or visit the reverse page); for temperature pairs, apply the inverse formula shown in the formula section.