Convert Kilowatt-hour to Watt-hour
1 kilowatt-hour = 1,000 watt-hour (Wh). For example, 10 kilowatt-hour = 10,000 watt-hour and 100 kilowatt-hour = 100,000 watt-hour. Type any value below to convert kilowatt-hour to watt-hour both ways — it runs entirely in your browser.
Quick answer: Kilowatt-hour to Watt-hour
1 Kilowatt-hour = 1,000 Watt-hour (kWh → Wh). To convert kilowatt-hour to watt-hour, multiply by 1,000. To convert watt-hour to kilowatt-hour, multiply by 0.001. The converter at the top does this instantly and both ways; the sections below give the formula, worked examples, a full conversion chart and answers to the most common kilowatt-hour-to-watt-hour questions.
How to convert Kilowatt-hour to Watt-hour
To convert kilowatt-hour to watt-hour, multiply the number of kilowatt-hour by the conversion factor 1,000, because 1 kWh = 1,000 Wh. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 Wh = 0.001 kWh, so you divide by 1,000 (or multiply by 0.001) to turn watt-hour back into kilowatt-hour.
Wh = kWh × 1,000 ·
kWh = Wh × 0.001
- Write down the value you want to convert, in kilowatt-hour.
- Multiply it by 1,000.
- The result is the same area/length/quantity expressed in watt-hour.
Kilowatt-hour to Watt-hour — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 kilowatt-hour is 5,000 watt-hour because 5 kWh × 1,000 = 5,000 Wh.
| Kilowatt-hour | Calculation | Watt-hour |
|---|---|---|
| 1 kWh | 1 kWh × 1,000 = 1,000 Wh | 1,000 Wh |
| 2 kWh | 2 kWh × 1,000 = 2,000 Wh | 2,000 Wh |
| 3 kWh | 3 kWh × 1,000 = 3,000 Wh | 3,000 Wh |
| 5 kWh | 5 kWh × 1,000 = 5,000 Wh | 5,000 Wh |
| 7 kWh | 7 kWh × 1,000 = 7,000 Wh | 7,000 Wh |
| 10 kWh | 10 kWh × 1,000 = 10,000 Wh | 10,000 Wh |
| 12 kWh | 12 kWh × 1,000 = 12,000 Wh | 12,000 Wh |
| 15 kWh | 15 kWh × 1,000 = 15,000 Wh | 15,000 Wh |
| 20 kWh | 20 kWh × 1,000 = 20,000 Wh | 20,000 Wh |
| 25 kWh | 25 kWh × 1,000 = 25,000 Wh | 25,000 Wh |
| 50 kWh | 50 kWh × 1,000 = 50,000 Wh | 50,000 Wh |
| 100 kWh | 100 kWh × 1,000 = 100,000 Wh | 100,000 Wh |
Common Kilowatt-hour to Watt-hour conversions
These are the kilowatt-hour-to-watt-hour values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 kilowatt-hour = 1,000 watt-hour
- 2 kilowatt-hour = 2,000 watt-hour
- 2.5 kilowatt-hour = 2,500 watt-hour
- 3 kilowatt-hour = 3,000 watt-hour
- 4 kilowatt-hour = 4,000 watt-hour
- 5 kilowatt-hour = 5,000 watt-hour
- 6 kilowatt-hour = 6,000 watt-hour
- 7 kilowatt-hour = 7,000 watt-hour
- 8 kilowatt-hour = 8,000 watt-hour
- 9 kilowatt-hour = 9,000 watt-hour
- 10 kilowatt-hour = 10,000 watt-hour
- 12 kilowatt-hour = 12,000 watt-hour
- 15 kilowatt-hour = 15,000 watt-hour
- 20 kilowatt-hour = 20,000 watt-hour
- 25 kilowatt-hour = 25,000 watt-hour
- 30 kilowatt-hour = 30,000 watt-hour
- 50 kilowatt-hour = 50,000 watt-hour
- 75 kilowatt-hour = 75,000 watt-hour
- 100 kilowatt-hour = 100,000 watt-hour
- 200 kilowatt-hour = 200,000 watt-hour
- 500 kilowatt-hour = 500,000 watt-hour
- 1000 kilowatt-hour = 1,000,000 watt-hour
Kilowatt-hour to Watt-hour conversion chart (both directions)
The chart below converts kilowatt-hour to watt-hour and watt-hour to kilowatt-hour side by side, so it works whichever way you need. 1 kilowatt-hour = 1,000 watt-hour, and 1 watt-hour = 0.001 kilowatt-hour.
| Kilowatt-hour → Watt-hour | Watt-hour → Kilowatt-hour |
|---|---|
| 0.25 kWh = 250 Wh | 0.25 Wh = 0.00025 kWh |
| 0.5 kWh = 500 Wh | 0.5 Wh = 0.0005 kWh |
| 1 kWh = 1,000 Wh | 1 Wh = 0.001 kWh |
| 2 kWh = 2,000 Wh | 2 Wh = 0.002 kWh |
| 3 kWh = 3,000 Wh | 3 Wh = 0.003 kWh |
| 4 kWh = 4,000 Wh | 4 Wh = 0.004 kWh |
| 5 kWh = 5,000 Wh | 5 Wh = 0.005 kWh |
| 6 kWh = 6,000 Wh | 6 Wh = 0.006 kWh |
| 7 kWh = 7,000 Wh | 7 Wh = 0.007 kWh |
| 8 kWh = 8,000 Wh | 8 Wh = 0.008 kWh |
| 9 kWh = 9,000 Wh | 9 Wh = 0.009 kWh |
| 10 kWh = 10,000 Wh | 10 Wh = 0.01 kWh |
| 12 kWh = 12,000 Wh | 12 Wh = 0.012 kWh |
| 15 kWh = 15,000 Wh | 15 Wh = 0.015 kWh |
| 20 kWh = 20,000 Wh | 20 Wh = 0.02 kWh |
| 25 kWh = 25,000 Wh | 25 Wh = 0.025 kWh |
| 30 kWh = 30,000 Wh | 30 Wh = 0.03 kWh |
| 40 kWh = 40,000 Wh | 40 Wh = 0.04 kWh |
| 50 kWh = 50,000 Wh | 50 Wh = 0.05 kWh |
| 75 kWh = 75,000 Wh | 75 Wh = 0.075 kWh |
| 100 kWh = 100,000 Wh | 100 Wh = 0.1 kWh |
| 150 kWh = 150,000 Wh | 150 Wh = 0.15 kWh |
| 200 kWh = 200,000 Wh | 200 Wh = 0.2 kWh |
| 250 kWh = 250,000 Wh | 250 Wh = 0.25 kWh |
| 500 kWh = 500,000 Wh | 500 Wh = 0.5 kWh |
| 1000 kWh = 1,000,000 Wh | 1000 Wh = 1 kWh |
Kilowatt-hour vs Watt-hour: which is bigger?
A kilowatt-hour is the larger unit: one kilowatt-hour equals 1,000 watt-hours. Put another way, you need 1,000 watt-hours to make a single kilowatt-hour.
What is a Kilowatt-hour? History, origin and usage
The kilowatt-hour — 1,000 watt-hours — became the universal trading unit of electrical energy as power grids spread in the late 19th and early 20th centuries. It rests on the watt, named after James Watt, scaled up to the household level.
The kilowatt-hour is the “unit” your electricity meter records and your utility bills you for; appliance running costs are worked out by multiplying an item’s kilowatt rating by the hours it runs and the price per kWh. It is the single most important energy unit in domestic and commercial energy.
One kilowatt-hour equals exactly 3.6 megajoules (3,600,000 joules), because a kilowatt is 1,000 joules per second and an hour is 3,600 seconds. Running a 1,000-watt appliance for one hour consumes exactly one kilowatt-hour — the figure people informally call a “unit” of electricity.
What is a Watt-hour? History, origin and usage
The watt-hour combines the watt — named after the Scottish engineer James Watt (1736-1819), improver of the steam engine — with the hour, giving the energy delivered by one watt of power sustained for one hour. It arose with the electrical industry as a convenient way to rate and bill energy rather than instantaneous power.
Watt-hours (and milliamp-hours, their close cousin) are the standard way to rate the capacity of batteries — from phones and laptops to power tools and electric-vehicle packs. The unit links power (watts) and time (hours) intuitively, making it easy to estimate how long a device will run.
Because power multiplied by time gives energy, a 10-watt device running for one hour uses 10 watt-hours — the same energy as a 100-watt device running for six minutes. A watt-hour equals exactly 3,600 joules, since an hour is 3,600 seconds.
Convert 1 Kilowatt-hour to other units
It can help to see a kilowatt-hour next to the other units it is commonly compared with. One kilowatt-hour (kWh) is equal to:
| 1 Kilowatt-hour equals | Unit |
|---|---|
| 3,600,000 J | Joule |
| 3,600,000 N·m | Newton-metre |
| 3,600 kJ | Kilojoule |
| 3.6 MJ | Megajoule |
| 1,000 Wh | Watt-hour |
| 0.001 MWh | Megawatt-hour |
| 2,655,224 ft·lbf | Foot-pound |
| 22,469,430,000,000,000,000 MeV | Megaelectronvolt |
| 860,420.7 cal | Calorie |
| 860.4207 kcal | Kilocalorie |
| 3,412.142 BTU | British Thermal Unit |
Convert 1 Watt-hour to other units
One watt-hour (Wh) is equal to:
| 1 Watt-hour equals | Unit |
|---|---|
| 3,600 J | Joule |
| 3,600 N·m | Newton-metre |
| 3.6 kJ | Kilojoule |
| 0.0036 MJ | Megajoule |
| 0.001 kWh | Kilowatt-hour |
| 0.000001 MWh | Megawatt-hour |
| 2,655.224 ft·lbf | Foot-pound |
| 22,469,430,000,000,000 MeV | Megaelectronvolt |
| 860.4207 cal | Calorie |
| 0.8604207 kcal | Kilocalorie |
| 3.412142 BTU | British Thermal Unit |
Tips for converting Kilowatt-hour to Watt-hour
- To go from kilowatt-hour to watt-hour, multiply by 1,000; to go back, divide by 1,000 (or multiply by 0.001).
- For a quick mental estimate, remember that 1 kilowatt-hour ≈ 1,000 watt-hour, so 10 kilowatt-hour ≈ 10,000 watt-hour.
- The converter above keeps full precision; the tables round for readability, so use the tool for exact figures.
- Both fields update live as you type — change either side to convert in that direction.
How to use this Kilowatt-hour to Watt-hour converter
Type a number into the Kilowatt-hour field and the equivalent in Watt-hour appears instantly — there is no “convert” button to press and nothing is sent to a server, so it works offline once the page has loaded and is safe for any data. You can also type into the Watt-hour field to convert the other way (watt-hour to kilowatt-hour). Use the swap control to flip the two units, and copy the result with a single click. Because the calculation runs in your browser with full floating-point precision, the converter is more exact than the rounded figures shown in the reference chart above — use the chart for quick look-ups and the tool for precise work.
Accuracy and method
Every figure on this page — the formula, the worked examples, the conversion chart and the “convert to other units” tables — is computed from a single verified conversion factor (1 kWh = 1,000 Wh), never copied from a hand-typed lookup table that could drift. That factor is derived from each unit’s definition in terms of a common base unit, and an automated check re-verifies all of the site’s factors on every update, so the numbers here stay correct over time. This matters for kilowatt-hour-to-watt-hour conversions because a small rounding error in a published table compounds quickly at larger quantities; computing from the exact factor avoids that.
Sources
- BIPM — The International System of Units (SI Brochure) — the defining document for the SI, published by the International Bureau of Weights and Measures. It fixes the base unit that this conversion resolves to, which is why the factor here can be exact rather than approximate.
- NIST — Definitions of the SI base units — the US National Institute of Standards and Technology reference for the SI base units, used here as an independent cross-check on the base-unit definition.
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Frequently asked questions
- How many watt-hour are in 1 kilowatt-hour?
- 1 kilowatt-hour = 1,000 watt-hour (Wh). To convert any number of kilowatt-hour to watt-hour, multiply by 1,000.
- How do I convert kilowatt-hour to watt-hour?
- Multiply the number of kilowatt-hour by 1,000. For example, 10 kilowatt-hour = 10 × 1,000 = 10,000 watt-hour, and 25 kilowatt-hour = 25,000 watt-hour.
- How many kilowatt-hour are in 1 watt-hour?
- 1 watt-hour = 0.001 kilowatt-hour. So to convert watt-hour back to kilowatt-hour, multiply by 0.001.
- What is the formula to convert kilowatt-hour to watt-hour?
- watt-hour = kilowatt-hour × 1,000. The reverse formula is kilowatt-hour = watt-hour × 0.001.
- How much is 100 kilowatt-hour in watt-hour?
- 100 kilowatt-hour = 100,000 watt-hour. (And 1000 kilowatt-hour = 1,000,000 watt-hour.)
- Which is bigger, a kilowatt-hour or a watt-hour?
- A kilowatt-hour is larger: 1 kilowatt-hour = 1,000 watt-hour.
- Is this kilowatt-hour to watt-hour converter accurate?
- Yes — every value is computed from the exact 1,000 Wh per kWh factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert watt-hour to kilowatt-hour too?
- Yes. The converter works both ways — enter a value in either field. 1 watt-hour = 0.001 kilowatt-hour.