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Convert watt-hours to BTU

1 Wh=3.41214BTU

Use the converter below to change any watt-hours value into BTU instantly — with formula, conversion table, and real-world examples.

3.412142

Conversion formula

Forward
BTU = watt-hours × 3.41214
Reverse
watt-hours = BTU × 0.2931

Example: 10 Wh × 3.41214 = 34.1214 BTU.

About both units

From

Watt-Hour

Wh

The watt-hour equals 3600 joules — 1 W delivered for 1 hour. Used for phone, laptop and small-battery capacities. A typical smartphone battery is 10–20 Wh; a laptop is 50–100 Wh.

Real-world: iPhone battery: 12 Wh. MacBook Pro: 70 Wh. Power bank: 20 Wh–100 Wh. Airplane carry-on limit: usually 100 Wh.
Read full watt-hour reference →
To

British Thermal Unit

BTU

The British Thermal Unit equals approximately 1055 joules — the energy to raise 1 pound of water by 1 °F. Used for HVAC, heating, and air-conditioning capacity in the US. A 9000 BTU/h AC is a small room unit.

Real-world: Window AC: 5000–12,000 BTU/h. Central AC: 24,000–60,000 BTU/h. Home furnace: 60,000–100,000 BTU/h.
Read full british thermal unit reference →

Watt-Hour to British Thermal Unit conversion table

Common watt-hours to BTU values for quick reference.

Watt-Hour (Wh)British Thermal Unit (BTU)
1 Wh3.41214 BTU
10 Wh34.1214 BTU
100 Wh341.214 BTU
500 Wh1,706.07 BTU
1,000 Wh3,412.14 BTU
5,000 Wh17,060.71 BTU
10,000 Wh34,121.42 BTU
50,000 Wh170,607.08 BTU
100,000 Wh341,214.16 BTU
500,000 Wh1,706,070.82 BTU

Tips & common mistakes

Quick tips

  • 1 Wh = 3600 J = 0.001 kWh.
  • Battery mAh × V = Wh. A 3000 mAh phone battery at 3.7 V = 11.1 Wh.
  • Airline limits lithium batteries to 100 Wh for carry-on.

Avoid these

  • Confusing mAh with Wh — need voltage to convert.
  • Using Wh when kWh is more appropriate for large batteries.
  • Forgetting the voltage in battery capacity calculations.

Frequently asked questions

How many BTU in a watt-hour?
One watt-hour equals 3.41214 BTU.
How do I convert watt-hours to BTU?
Multiply the watt-hour value by 3.41214 to get the equivalent in BTU.
What is 100 watt-hours in BTU?
100 watt-hours equals 341.214 BTU.
Is a watt-hour bigger than a british thermal unit?
Yes. 1 watt-hour equals 3.41214 BTU, so one watt-hour is larger.
How to convert watt-hours to BTU without a calculator?
Multiply by 3.41 for a quick estimate; use a calculator for precise results.

Related energy conversions

📊 See full comparison matrix →

More from Watt-Hour

Wh → J
1 = 3,600 J
Wh → kJ
1 = 3.6 kJ
Wh → MJ
1 = 0.0036 MJ
Wh → kWh
1 = 0.001 kWh
Wh → cal
1 = 860.421 cal
Wh → kcal
1 = 0.8604 kcal
Wh → eV
1 = 2.2469e22 eV
Wh → thm
1 = 3.4121e-5 thm

More to British Thermal Unit

J → BTU
1 = 0.0009478 BTU
kJ → BTU
1 = 0.9478 BTU
MJ → BTU
1 = 947.817 BTU
kWh → BTU
1 = 3,412.14 BTU
cal → BTU
1 = 0.003966 BTU
kcal → BTU
1 = 3.96567 BTU
eV → BTU
1 = 1.5186e-22 BTU
thm → BTU
1 = 100,000 BTU

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