Convert Btu, kBtu, MMBtu, or therms to MWh, kWh, Wh, joules, and metric energy units, or reverse the calculation using IT or thermochemical Btu.
Assumptions Assumptions
- Conversions are unit-to-unit energy only—no efficiency, heat-rate, or fuel property adjustments.
- Default Btu is the International Table Btu (IT); thermochemical Btu (th) is provided and differs slightly.
- Exact definitions used: 1 kWh = 3.6×106 J; 1 MWh = 3.6×109 J.
- MMBtu means one million Btu; kBtu means one thousand Btu; 1 therm (US) = 100,000 Btu (IT).
When to Use This Calculator
- Converting natural gas usage (MMBtu/therms) to electric consumption (MWh/kWh) for budgeting or reporting.
- Standardizing energy across projects that mix heat content (Btu) and electrical energy (MWh).
- Cross-checking invoices, utility data, or emissions calculations that require consistent units.
Input Definitions
- Btu-based energy — Btu (IT), Btu (th), kBtu (IT), MMBtu (IT), and US therms (100,000 Btu IT).
- Electrical energy — Wh, kWh, MWh, GWh, or in Joules: J, kJ, MJ, GJ.
- Conversions — Use Joules as the bridge: MWh = Btu × 1055.05585262 ÷ (3.6×109); equivalently, Btu = MWh × 3.412141633×106.
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Btu to MWh Formula
The following formulas convert Btu to MWh and back using the International Table Btu (IT).
MWh = (Btu) / (3.412141633 × 10⁶)
Btu = MWh × 3.412141633 × 10⁶
- 1 Btu (IT) = 1055.05585262 J
- 1 Btu (th) = 1054.35026444 J
- 1 kWh = 3.6 × 106 J (exact)
- 1 MWh = 3.6 × 109 J (exact)
- 1 MMBtu = 1,000,000 Btu; 1 kBtu = 1,000 Btu
- 1 therm (US) = 100,000 Btu (IT)
How do you convert Btu to MWh? Multiply Btu by 1055.05585262 to get Joules, then divide by 3.6×109 J/MWh; equivalently, divide Btu by 3,412,141.633 to get MWh.
How do you convert MWh to Btu? Multiply MWh by 3,412,141.633 to get Btu (IT), or multiply MWh by 3.6×109 J and divide by 1055.05585262 J/Btu.
Btu to MWh Conversion Table
| MMBtu (IT) | MWh |
|---|---|
| 0.125 | 0.036634 |
| 0.25 | 0.073268 |
| 0.5 | 0.146536 |
| 0.75 | 0.219803 |
| 1 | 0.293071 |
| 1.25 | 0.366339 |
| 1.5 | 0.439607 |
| 1.75 | 0.512874 |
| 2 | 0.586142 |
| 2.5 | 0.732678 |
| 3 | 0.879213 |
| 4 | 1.172284 |
| 5 | 1.465355 |
| 7.5 | 2.198033 |
| 10 | 2.930711 |
| * Using IT Btu: 1 MWh = 3,412,141.633 Btu (IT) ⇒ 1 MMBtu = 0.29307107 MWh. | |
Example Problem
Convert 2.5 MMBtu (IT) to MWh.
Use the formula: MWh = Btu ÷ 3,412,141.633.
MWh = 2,500,000 ÷ 3,412,141.633 ≈ 0.7327 MWh
