Watts to BTU per Hour Converter
Enter a wattage value and instantly get the equivalent BTU per hour for HVAC sizing and heating calculations.
Enter Watts
Converting: Watts → BTU/hr
Common values
Result
Enter a value to see the result
BTU per Hour
—
BTU/hr
BTU/min
—
Kilowatts
—
Tons of AC
—
Horsepower
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Common Watts to BTU/hr Reference
| Watts (W) | BTU/hr | Typical Use |
|---|---|---|
| 100 | 341 | Light bulb / small fan |
| 500 | 1,706 | Small space heater (low) |
| 1,000 | 3,412 | Desktop PC / small heater |
| 1,500 | 5,118 | Standard space heater |
| 3,517 | 12,000 | 1-ton air conditioner |
| 5,000 | 17,061 | 5 kW heat pump |
| 7,034 | 24,000 | 2-ton air conditioner |
| 10,000 | 34,121 | Large HVAC unit / furnace |
Summary
Enter a wattage value and instantly get the equivalent BTU per hour for HVAC sizing and heating calculations.
How it works
- Enter a wattage value in the input field.
- The converter multiplies your value by 3.41214 to get BTU/hr.
- Results update in real time as you type.
- Use the Swap button to reverse the conversion (BTU/hr → watts).
- Click Copy to copy the result to your clipboard.
Use cases
- Size an HVAC system by converting electric heater wattage to BTU/hr.
- Compare heat pump output ratings between metric (W) and imperial (BTU/hr) specs.
- Estimate cooling capacity needed when appliance heat load is given in watts.
- Convert data center server thermal dissipation (W) to BTU/hr for cooling planning.
- Check if a portable air conditioner (BTU/hr) can offset a known watt heat source.
- Convert electric furnace or baseboard heater ratings for duct sizing calculations.
Frequently Asked Questions
Last updated: 2026-07-22 ·
Reviewed by Nham Vu