Convert Watts (W) to Btu/hour (Btu/h)
1 watt equals 3.41214 Btu/hour.
Watt to Btu/hour Converter
What Is a Watt?
The watt (W) is the SI unit of power equal to one joule per second. It is the international standard for measuring electrical power, heating output, and cooling capacity. Most countries rate appliances and HVAC equipment in watts or kilowatts.
What Is a BTU per Hour?
The BTU per hour (BTU/h or Btu/h) is an imperial unit of power commonly used in the United States for heating and cooling equipment. One BTU (British Thermal Unit) is the energy needed to raise 1 pound of water by 1°F. The BTU/h measures the rate of this energy transfer.
Watts to BTU/h Formula
The conversion factor is:
BTU/h = watts × 3.41214
Derived from: 1 BTU = 1,055.056 J, and 1 Wh = 3,600 J. So 3,600 ÷ 1,055.056 = 3.41214.
Worked Example
Convert 1,500 watts (a standard electric space heater) to BTU/h:
- Multiply: 1,500 × 3.41214 = 5,118 BTU/h
Quick Estimation
×3.4 for a quick estimate (0.4% error). Or: 1 kW ≈ 3,412 BTU/h. Example: 2,000 W × 3.4 = 6,800 BTU/h (exact: 6,824).
Common Watts to BTU/h Conversions
| Watts | BTU/h | Context |
|---|---|---|
| 100 W | 341 BTU/h | Incandescent bulb heat output |
| 500 W | 1,706 BTU/h | Small electric heater |
| 750 W | 2,559 BTU/h | Oil-filled radiator (low) |
| 1,000 W | 3,412 BTU/h | 1 kW — standard heater (low setting) |
| 1,500 W | 5,118 BTU/h | Standard US space heater (max) |
| 2,000 W | 6,824 BTU/h | Professional hair dryer / large heater |
| 3,000 W | 10,237 BTU/h | Electric baseboard heater |
| 5,000 W | 17,061 BTU/h | Electric furnace (small) |
| 10,000 W | 34,121 BTU/h | Large electric furnace / 3-ton AC |
| 15,000 W | 51,182 BTU/h | Commercial heating element |
When You Need This Conversion
- Heater sizing: US space heaters are sold with BTU/h ratings; European heaters use watts. A 1,500 W heater = 5,118 BTU/h — the standard US portable heater (limited to 1,500 W on a 15A circuit).
- Furnace comparison: Gas furnaces are rated in BTU/h; heat pumps in kW. A 40,000 BTU/h gas furnace ≈ 11.7 kW thermal output.
- HVAC engineering: Heating load calculations may use either unit. Converting ensures consistency when combining heating and cooling specs.
Frequently Asked Questions
How many BTU is 1,500 watts?
5,118 BTU/h (1,500 × 3.412). This is the output of a standard US portable electric space heater at maximum.
How many watts is 1 BTU/h?
0.29307 watts. To convert BTU/h to watts, multiply by 0.293 (or divide by 3.412).
What is the difference between BTU and BTU/h?
BTU is energy (total heat). BTU/h is power (rate of heat transfer per hour). A heater rated at 5,000 BTU/h running for 2 hours produces 10,000 BTU of total heat.
How many BTU/h is 1 kW?
3,412 BTU/h. So a 10 kW heater = 34,121 BTU/h. This is useful for comparing metric and US heating equipment.
Common Watt to Btu/hour Conversions
| Watt | Btu/hour | Actions |
|---|---|---|
| 1 watt | 3.41214 Btu/hour | |
| 100 watts | 341.214 Btu/hour | |
| 1000 watts | 3412.14 Btu/hour |
| Watt | Btu/hour | Actions |
|---|---|---|
| 5000 watts | 17060.7 Btu/hour | |
| 10000 watts | 34121.4 Btu/hour |
Watts to Btu/hour Conversion Table
Reference table with common watts to btu/hour conversions. All values calculated with high precision.
Watts to Btu/hour Table
0.0001 to 12
Watts to Btu/hour Table
1 to 100000
Btu/hour to Watts Table
0.001 to 5
Btu/hour to Watts Table
10 to 1000000
Looking for the reverse? Convert Btu/hour to Watt
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- Joules to kWh — Energy = power × time (kWh = kW × hours)
