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Every page on BTU to Watts, organized so you can find what you need.
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Converters
19 dedicated tool pages, each with its own live calculator, interactive scale diagram, formula derivation, reference table, worked example, and FAQ.
Watts to BTU/hr
Electrical and thermal wattage converted to HVAC heat rate.
BTU/hr to kW
Kilowatts for metric and European HVAC specs.
BTU/hr to MW
Megawatts for industrial chillers and power plants.
kVA to BTU/hr
Apparent power to heat output with power factor.
BTU/hr to Horsepower
Thermal power in mechanical hp for motor sizing.
BTU/hr to kcal/hr
Metric calorie-based HVAC spec conversion.
BTU/hr to MBH
Commercial HVAC schedules and boiler plate ratings.
BTU/s to Watts
Per-second heat-transfer rate to SI watts.
BTU/hr to Tons
Cooling capacity from BTU/hr nameplate to contractor tonnage.
BTU/min to Watts
Bench-test minute-rate heat flux to SI watts.
BTU/day to Watts
Daily heat-gain budgets to steady-state watts.
BTU to kWh
Energy quantity for gas-vs-electric cost comparisons.
BTU to Joules
Exact SI energy conversion for physics and chemistry.
BTU to kJ
Engineering and food-science energy in kilojoules.
BTU to MMBTU
Million-BTU for natural gas contracts and trading.
BTU to Therms
100,000-BTU units for residential gas bills.
BTU to Wh
Watt-hours for battery and small-device equivalence.
BTU/lb to Watts
Combustion power from fuel heating value and mass flow.
BTU per sq ft
Room cooling/heating load estimate by area and climate.
Size guides
12,000 BTU to kW
Worked 3.517 kW conversion and nearby sizes.
12,000 BTU to Tons
One-ton reference with sizing context.
24,000 BTU to HP
Worked 9.432 mechanical hp heat-flow equivalence.
BTU to kW Chart
9,000 to 60,000 BTU/hr reference chart.
18,000 BTU to kW
5.275 kW, 1.5-ton room and electrical guide.
18,000 BTU to Tons
1.5-ton HVAC sizing and EER guide.
24,000 BTU to kW
7.034 kW, 2-ton room and electrical guide.
24,000 BTU to Tons
2-ton HVAC sizing and EER guide.
12,000 BTU to HP
4.716 mechanical hp and AC sales classes.
36,000 BTU to kW
10.551 kW, 3-ton central AC guide.
36,000 BTU to Tons
3-ton central AC sizing and EER guide.
HVAC calculators
AC Size Calculator
Estimate cooling capacity from area, climate, insulation, and sun exposure.
BTU per sq ft Calculator
Estimate room heating or cooling load from area and climate.
Heater Size Calculator
Estimate heating output for furnaces, boilers, and space heaters.
Mini-Split Size Calculator
Size ductless heads independently for each room or zone.
Pool Heater Size Calculator
Calculate pool-heater BTU/hr from volume and heat-up time.
Blog
Long-form articles on BTU and watts — the math, the units, and the practical sizing decisions behind both.
Blog Index
All articles on BTU, watts, and HVAC sizing.
BTU vs Watts
What the two units measure and how they differ.
How to Convert BTU to Watts
Formula, worked examples, and mental-math shortcuts.
How to Convert Watts to BTU
Multiply watts by 3.412 — examples for every appliance.
BTU to Watts Chart
Quick-reference tables for AC sizing, heat pumps, and more.
BTU to Watts for Air Conditioners
Cooling capacity, electrical input, efficiency, and surge.
How Many BTU Is 1,500 Watts?
Heater output, electricity cost, amperage, and safety.
How Many BTU Is One Watt?
The base 3.412142 BTU/hr conversion explained.
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