A Btu can be approximated as the heat produced by burning a single wooden kitchen match or as the amount of energy it takes to lift a one-pound (0.45 kg) weight 778 feet (237 m).

Two free calculators estimate the number of BTUs needed to cool or heat a room or house based on its size, insulation, and some other conditions.

Feb 6, 2023 · 1 BTU = the energy required to raise the temperature of 1 pound of water by 1°F. For air conditioning applications, BTU represents how much heat an AC unit can remove from …

A BTU is a relatively small amount of energy... about equivalent to the heat generated by striking 1 stick match. You can calculate BTU heating or cooling requirements for your process by …

Calculating BTU doesn’t have to be difficult. If you correctly measure the square footage and know the room/home layout, you can calculate the BTU requirements for any air conditioner or …

Oct 28, 2025 · At its core, the formula for a BTU is a simple scientific principle: heating one pound of water by one degree Fahrenheit. However, its true value lies in the practical formulas that …

Dec 4, 2025 · A quick HVAC field reference with formulas for CFM, BTU, Cv, GPM, ΔT, superheat, and subcooling. Use these calculations to verify system capacity, airflow, valve …

Dec 8, 2025 · Easy Heater BTU Calculator with formulas, examples, and simple explanation. Calculate the correct heater size in BTU/hr and Watts based on your room size and …

Dec 8, 2025 · British thermal unit (Btu) is a measure of the heat content of fuels or energy sources. One Btu is the quantity of heat required to raise the temperature of one pound of …

For heating, a common formula is: BTUs required = Room area (in sq ft) × 35–40 (depending on insulation and climate). Climate: Hotter climates need higher BTUs. Insulation: Poorly …