Quick Answer: Kilowatt-hours to Megawatt-hours
One kilowatt-hour equals 0.001 megawatt-hours (1 kWh = 0.001 MWh).
Conversely, 1 MWh = 1,000 kWh.
Formula: MWh = kWh ÷ 1,000
Worked examples
- 100 kWh = 0.1 MWh
- 500 kWh = 0.5 MWh
- 1000 kWh = 1 MWh
Method and limitations
A megawatt-hour is one thousand kilowatt-hours. Divide by 1,000 to move from household scale to grid and commercial scale. Calculations use full-precision constants; displayed values are rounded to at most 9 significant figures. Results are rounded for display only. Full precision is kept internally, so long chains of conversions do not accumulate rounding error. Where US customary and imperial units share a name (for example fluid ounces and gallons), this page uses the US customary definition and says so explicitly.
Each factor is exact by definition, derived from exact definitions, or a documented conventional value — see the methodology and sources.
Conversion Formula
A megawatt-hour is one thousand kilowatt-hours. Divide by 1,000 to move from household scale to grid and commercial scale.
Complete Guide to Kilowatt-hours to Megawatt-hours Conversion
What is a Kilowatt-hours?
A kilowatt-hour (kWh) is the household unit of electrical energy: one kilowatt for one hour. Meters, tariffs and battery specifications all use it.
What is a Megawatt-hours?
A megawatt-hour (MWh) is 1,000 kWh, the working unit of commercial energy contracts, renewable generation reporting and wholesale electricity markets.
How the Conversion Works
This is a pure SI prefix step. Kilo means one thousand and mega means one million, so a megawatt-hour is exactly one thousand kilowatt-hours. No physical constants are involved and the conversion is exact.
Why This Conversion Matters
Energy reporting spans nine orders of magnitude, from a phone battery in watt-hours to national demand in terawatt-hours. Moving fluently between kWh and MWh is what lets a homeowner understand a utility-scale press release, and what lets a business compare its consumption against a supply contract.
Scientific Context
SI prefixes scale by factors of 1,000: kilo (10³), mega (10⁶), giga (10⁹), tera (10¹²). Grid operators publish demand in GW and consumption in TWh, both derived from the same watt base unit.
Step-by-Step Conversion Guide
Follow these steps to convert kilowatt-hours to megawatt-hours manually:
Start with your value in kilowatt-hours
Example: You want to convert 1000 kWh
Apply the conversion formula
Use the formula: MWh = kWh ÷ 1,000
Calculate the result
1000 kWh = 1 MWh
Verify your answer
Use our calculator above to double-check your manual calculation.
Quick Mental Math Tip
A megawatt-hour is one thousand kilowatt-hours. Divide by 1,000 to move from household scale to grid and commercial scale.
Common Conversions
| Kilowatt-hours (kWh) | Megawatt-hours (MWh) | Megawatt-hours → Kilowatt-hours |
|---|---|---|
| 100 kWh | 0.1 | 100 MWh = 100,000 kWh |
| 500 kWh | 0.5 | 500 MWh = 500,000 kWh |
| 1000 kWh | 1 | 1000 MWh = 1,000,000 kWh |
| 2500 kWh | 2.5 | 2500 MWh = 2,500,000 kWh |
| 5000 kWh | 5 | 5000 MWh = 5,000,000 kWh |
| 10000 kWh | 10 | 10000 MWh = 10,000,000 kWh |
| 25000 kWh | 25 | 25000 MWh = 25,000,000 kWh |
| 50000 kWh | 50 | 50000 MWh = 50,000,000 kWh |
| 100000 kWh | 100 | 100000 MWh = 100,000,000 kWh |
When You'll Need This Conversion
Commercial energy contracts
Power purchase agreements and business tariffs are priced per MWh.
Understanding solar farm output
Convert a project's annual MWh into the number of homes it could supply.
Energy reporting and journalism
Move between household and national scale without losing a factor of a thousand.
Battery storage projects
Grid batteries are specified in MWh of capacity and MW of output.
Pro Tips for Accurate Conversions
Sanity-check the order of magnitude
A home uses about 3.5–5 MWh per year. If your answer is 500 MWh for a house, you slipped a prefix.
Keep power and energy separate
MW is a rate, MWh is a quantity. Contracts nearly always price the MWh.
Use MWh for anything above 10,000 kWh
It reduces transcription errors in spreadsheets and reports.
Common Mistakes to Avoid
Writing MW when you mean MWh
This is the most common error in energy reporting and changes the meaning entirely.
Capacity is MW; production over a period is MWh.
Dividing by 100 instead of 1,000
A factor of ten error that survives review surprisingly often.
kWh ÷ 1,000 = MWh, always.
Comparing installed MW to consumed MWh
A 1 MW solar array does not produce 1 MWh every hour — output depends on irradiance.
Multiply capacity by capacity factor and hours to get MWh.
History & Background
As electricity systems scaled from single city blocks to national grids, reporting units climbed the SI prefix ladder from watt-hours to terawatt-hours within a century.
Key Milestones
The first central power stations serve a few hundred customers, measured in kWh.
National grid interconnection makes MWh and GWh the natural reporting units.
Wholesale electricity markets standardise on price per MWh.
Grid-scale batteries are procured in MWh of storage and MW of discharge power.
Global Usage Today
MWh is the global standard in wholesale power trading and renewable generation reporting; kWh remains universal for retail billing.
Frequently Asked Questions
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Conversion factors on this page are either exact by definition, derived from exact definitions, or conventional values in documented use. Each is listed with its source in our conversion methodology and sources, which cites the BIPM SI Brochure, NIST Special Publication 811 and the relevant IEC or national standards. Results are rounded for display only; calculations use full precision.