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`BTUs"/"hr = DeltaT * "W" * "L" * "H" * c`

Enter a value for all fields

The **BTUs per hour to Heat a Room** calculator computes the energy (heat) required to heat a space of a certain volume by a specified temperature variance.

**INSTRUCTIONS:** Choose units and enter the following:

**(L)**Length of Room**(W)**Width of Room**(H)**Height of Room**(ΔT)**Change in Temperature- (
**c**) Heat Transfer Coefficient in BTUs per cubic foot

**BTUs per Hour (BpH): ** The calculator returns the energy rate in BTUs per hour. However, this can be automatically converted into other volume units (e.g. cubic yards or meters) via the pull-down menu.

The formula to compute the energy to heat a room is:

BpH = L * W * H * ΔT * c

where:

- BpH = BTUs per hour to support the temperature variance in a room volume
- L = Length of Room
- W = Width of Room
- H = Height of Room
- ΔT = Temperature Variance
- c = Heat Transfer Coefficient (BTUs per hour, per cubic foot per degree Fahrenheit)

This formula is base on the simple formula mentioned in the Ferrell Gas article on How many BTUs you need to heat your home, shop, garage, and more!.

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