Fuel-energy comparison
100,000 BTU equals approximately 29.307 kWh of energy.
Power conversion
BTU to kWh
Convert BTU (energy) to kilowatt-hours at the fixed ratio 1 kWh = 3,412.142 BTU.
1 BTU0.000293 kWh
BTU
Accepts zero, positive values, decimals, and either a dot or comma decimal separator.
29.3071kWh
How to convert BTU to kWh
Three steps complete the conversion:
01
Identify total BTU energy
Annual heating loads, utility bill totals, and food-calorie equivalents all measure energy in BTU.
02
Divide by 3,412.142
The result is kWh of equivalent energy. No time component is needed.
03
Use kWh for electric-billing math
Multiply by your electric rate to get the dollar equivalent of the same energy delivered as electricity.
Formula
BTU to kWh formula
BTU → kWh
E(kWh) = E(BTU) ÷ 3,412.142
kWh → BTU
E(BTU) = E(kWh) × 3,412.142
Worked example
Convert 100,000 BTU of natural gas energy — roughly one therm — to kWh. The result, 29.31 kWh, is the equivalent electrical energy at 100% conversion efficiency.
Start
100,000 BTU
Apply
× 0.000293
Result
≈ 29.3071 kWh
Interactive
Scale explorer for BTU to kWh
Drag the slider or click a tier to see where your BTU value lands on the equipment scale — with live kWh output.
British Thermal Units
100,000
BTU
Kilowatt-hours
29.3071
kWh
Closest tier:1 therm— ≈ 29 kWh
Visual scale
BTU vs other energy units (in joules)
Energy magnitudes across imperial, SI, and gas-billing units.
Log scale (×10 between gridlines)
Click any bar to set as reference
Reference: 1 BTU (1,055 J). In this btu vs other energy units (in joules) chart, the other bars show the ratio relative to that selected value.
Fundamentals
What is BTU to kWh?
BTU to kWh converts British Thermal Units to kilowatt-hours by dividing the BTU value by 3,412.142. 1 kilowatt-hour equals 3,412.142 BTU (international BTU) of energy. The formula is E(kWh) = E(BTU) ÷ 3,412.142 or E(kWh) = E(BTU) × 0.00029307. This page covers the energy form — total quantity of heat, not the rate (BTU/hr) used on equipment nameplates. Use it for utility bill comparisons, gas-vs-electric cost analysis, and annual building-load summaries.
A BTU is a unit of energy: the heat required to raise one pound of water by one degree Fahrenheit. A kilowatt-hour is also a unit of energy: one kilowatt of power delivered for one hour. Both measure the same physical quantity in different unit systems.
Because BTU is an energy quantity, not a rate, conversion to kWh is a single-factor division with no time dependency. The factor 3,412.142 comes from 3,600,000 joules per kWh divided by 1,055.056 joules per BTU.
This conversion appears every time gas (priced per therm or MMBTU) is compared with electricity (priced per kWh). Both quantities must be in the same unit before the cost comparison is meaningful.
Applications
When to convert BTU to kWh
Real-world scenarios where this conversion shows up in engineering, HVAC, and equipment specification work.
Gas vs electric cost comparison
Convert natural-gas BTU to kWh, then compare at the local electric rate to see which fuel is cheaper per unit of heat.
Energy audit reports
Annual building-energy use is often summed in BTU; reporting tools and benchmarking certifications require kWh.
Solar offset planning
Convert annual heating BTU loads to kWh to size a PV array that could offset gas usage with electric heat pump alternatives.
Battery storage equivalence
Translate heating-fuel BTU to kWh to estimate the battery capacity that would store the same energy.
Carbon-intensity comparisons
Carbon emissions per kWh and per BTU need a common unit before comparison; this converter is the bridge.
Guidance
Tips and common pitfalls
BTU is energy, not power
Don't confuse BTU (total heat) with BTU/hr (rate of heat). Equipment labels use BTU/hr; bills and audits use BTU.
kWh = power × time
kWh implies an hour-long delivery at the rated power. Energy total is independent of how fast it's delivered.
Match fuel to delivered energy
100,000 BTU of natural gas burned at 90% furnace efficiency delivers only 90,000 BTU (≈ 26.4 kWh) of useful heat.
Reference
BTU to kWh conversion table
| British Thermal Units (BTU) | Kilowatt-hours (kWh) |
|---|---|
| 1,000 BTU | 0.293071 kWh |
| 5,000 BTU | 1.4654 kWh |
| 10,000 BTU | 2.9307 kWh |
| 25,000 BTU | 7.3268 kWh |
| 50,000 BTU | 14.6536 kWh |
| 100,000 BTU | 29.3071 kWh |
| 250,000 BTU | 73.2678 kWh |
| 500,000 BTU | 146.54 kWh |
| 1,000,000 BTU | 293.07 kWh |
| 2,500,000 BTU | 732.68 kWh |
| 5,000,000 BTU | 1,465.36 kWh |
| 10,000,000 BTU | 2,930.71 kWh |
In practice
Industry context and practical notes
How gas-to-electric cost comparison actually works
Homeowners debating gas furnace vs heat pump start with cost per BTU of useful heat. Gas: divide the price per therm by 100,000 (BTU per therm), then divide by AFUE (typically 0.92 for high-efficiency). Electric: divide the price per kWh by 3,412, then multiply by COP (typically 2.5-4 for heat pumps). The two numbers — $ per useful BTU — are directly comparable. The conversion BTU ↔ kWh is the required step. Without it, you're comparing apples and oranges.
Carbon math hinges on the same number
Climate analyses translate fuel BTU to electric-equivalent kWh, then apply grid-specific emissions factors (kg CO₂ per kWh) to compute carbon intensity. A natural-gas-burned BTU has a fixed carbon factor (~117 g CO₂/MMBTU); an electric-kWh varies by region (50 g/kWh in renewable-heavy California, 800+ g/kWh in coal-heavy Wyoming). The BTU-to-kWh conversion is the connector that lets policy modelers compare them on an apples-to-apples basis. Modern decarbonization studies live on this single conversion factor.
Did you know
The therm — a common natural-gas billing unit — is exactly 100,000 BTU. So 1 therm = 29.3071 kWh. This is the cleanest mental anchor for translating gas bills to electric-equivalent energy.
Interpretation
How to interpret this result
BTU and kWh are energy quantities, so no runtime is needed for a direct conversion. Electricity cost still requires a user-supplied price per kWh; this converter does not fetch live utility rates.
A kilowatt-hour is the energy transferred by one kilowatt operating for one hour. Kilowatts describe rate, kWh describes accumulated electrical energy, and coefficient of performance connects purchased electricity to useful heating or cooling energy.
Examples
Practical calculation scenarios
Billing context
If 29.307 kWh is converted to useful heat, actual purchased electricity depends on the equipment efficiency or heat-pump coefficient of performance.
Quality check
Mistakes to avoid
- Confusing kWh with kW
- Adding a time period to an energy-to-energy conversion
- Assuming equal energy units imply equal operating cost
Technical reference: U.S. Department of Energy energy-unit glossary.
Scope
Limitations and assumptions
BTU and kWh are both energy quantities, but equal energy does not imply equal cost or useful output. Utility rates, fuel prices, appliance efficiency, heat-pump COP, standby losses, and taxes are excluded.
Questions
Frequently asked
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Place BTU to kWh in the wider BTU/hr and watts formula context.
Trust and accuracy
Methodology and accuracy
The conversion uses the international-table BTU and 1 kWh = 3,600,000 joules. It converts energy directly and does not require or assume a run time. The supporting constants and review policy for the kwh calculation are documented on our calculator methodology page.
Last reviewed: August 7, 2026
Calculator summary
This calculator compares energy quantities in BTU and kWh. Add your own current price and equipment efficiency when estimating purchased energy or operating cost.