kWh to MWh Calculator

Convert kilowatt-hours to megawatt-hours instantly. 1 MWh = 1,000 kWh — the standard unit for energy billing, battery storage, and carbon accounting.

kWh
MWh
1,000 kWh = 1 MWh

Power vs. Energy: Why kWh and MWh Matter

Understanding the critical difference between power (kW) and energy (kWh)

The kilowatt-hour (kWh) and megawatt-hour (MWh) measure energy — the total amount of work done or electricity consumed over a period of time. This is fundamentally different from kilowatts (kW) and megawatts (MW), which measure power — the instantaneous rate of energy transfer. Your electricity bill charges you in kWh because it reflects the total energy your home consumed, not the peak rate at which it used it. A 2 kW space heater running for 5 hours uses 10 kWh (2 kW × 5 h = 10 kWh) of energy.

Megawatt-hours (MWh) become the preferred unit when dealing with utility-scale energy quantities. Power Purchase Agreements (PPAs) between solar farms and utilities price electricity in dollars per MWh ($/MWh). Battery storage systems like the Tesla Megapack are rated in both MW (power capacity) and MWh (energy capacity) — a Megapack 2 XL is rated at 3.9 MW / 3.9 MWh, meaning it can discharge at 3.9 MW for exactly 1 hour, or at 1.95 MW for 2 hours. Carbon emission reports also use MWh as the basis for calculating greenhouse gas intensity.

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kWh: Household Energy

How kilowatt-hours show up in residential energy consumption.

  • 🏠 U.S. home annual usage: 10,500 kWh
  • 📱 Charging a smartphone (year): ~2 kWh
  • 🚗 Tesla Model 3 full charge: ~60 kWh
  • 🧊 Refrigerator (annual): ~400 kWh
  • 💰 Avg. U.S. cost per kWh: ~$0.16
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MWh: Grid & Storage Scale

How megawatt-hours are used in utility-scale energy and storage.

  • 📦 Tesla Megapack 2 XL: 3.9 MWh
  • ☀️ 1 MW solar farm (annual): ~1,500 MWh
  • 💰 Wholesale price (U.S.): $30–60/MWh
  • 🌍 CO₂ per MWh (U.S. avg): 0.386 t CO₂
  • 🏭 Moss Landing BESS: 3,000 MWh

kWh to MWh Conversion Formula

How to convert energy units from kilowatt-hours to megawatt-hours

01

kWh to MWh Formula

MWh = kWh ÷ 1,000

Divide the kilowatt-hour value by 1,000 to get megawatt-hours. The factor is the same 1,000:1 ratio as kW to MW, because energy is power × time.

02

Power vs. Energy

Power: kW = rate of energy use
Energy: kWh = kW × hours
Scale up: MWh = kWh ÷ 1,000
💡 Example: A 5 kW system running 200 hrs/month = 1,000 kWh = 1 MWh per month

kWh to MWh Quick Reference Table

Kilowatt-hours (kWh)Megawatt-hours (MWh)
100 kWh0.1 MWh
250 kWh0.25 MWh
500 kWh0.5 MWh
750 kWh0.75 MWh
1,000 kWh1 MWh
1,500 kWh1.5 MWh
2,000 kWh2 MWh
3,000 kWh3 MWh
3,900 kWh3.9 MWh
5,000 kWh5 MWh
10,000 kWh10 MWh
10,500 kWh10.5 MWh
25,000 kWh25 MWh
50,000 kWh50 MWh
100,000 kWh100 MWh

Frequently Asked Questions

What is the difference between kWh and kW?

kW (kilowatt) measures power — the rate of energy transfer at any given instant. kWh (kilowatt-hour) measures energy — the total amount of power consumed over time. A 1 kW appliance running for 1 hour uses 1 kWh of energy. Think of kW as the speedometer (how fast) and kWh as the odometer (how far).

How many kWh are in 1 MWh?

There are exactly 1,000 kWh in 1 MWh. The prefix "mega" (10⁶) is 1,000 times larger than "kilo" (10³), so 1 megawatt-hour equals 1,000 kilowatt-hours. To convert kWh to MWh, divide by 1,000.

How much energy does the average U.S. home use in MWh?

The average U.S. home uses approximately 10.5 MWh (10,500 kWh) of electricity per year, or about 0.875 MWh per month. This varies significantly by region — homes in Louisiana average 14.3 MWh/year, while Hawaii averages only 6.2 MWh/year due to higher efficiency and milder cooling needs.

What is a MWh worth in electricity cost?

At the average U.S. residential rate of approximately $0.16/kWh, one MWh (1,000 kWh) costs about $160 for residential customers. Wholesale electricity prices are much lower, typically $30–$60/MWh in U.S. markets, which is the price utilities pay to purchase bulk power from generators.

How is MWh used in carbon footprint calculations?

MWh is the standard unit for calculating grid electricity carbon emissions. The EPA publishes emission factors by region — for example, the U.S. national average is approximately 0.386 metric tons of CO₂ per MWh. Multiplying MWh consumed by the regional emission factor gives the carbon footprint in metric tons of CO₂.

How many MWh does a Tesla Megapack store?

A single Tesla Megapack 2 XL stores approximately 3.9 MWh (3,900 kWh) of energy. A 100 MWh grid-scale battery installation would require about 26 Megapack units. The Moss Landing Energy Storage Facility in California has 3,000 MWh of capacity — one of the world's largest battery installations.