Home Heating Tools & Calculators
Free, practical calculators for a warmer home — size the heat a room needs, measure heat loss, spec a radiator or heat pump, work out running costs, and find any room's volume.
Heating BTU Calculator
Estimate the heating output a room needs in BTU/hr from its floor area and your local climate — a fast rule-of-thumb starting point for sizing a heater, stove, or heating system
Heat Loss Calculator
See how much heat escapes through a wall, roof, floor, or window from its area, U-value, and the inside-to-outside temperature difference — the way to spot where insulation pays off
Radiator Size Calculator
Work out the radiator output a room needs in BTU from its air volume and a per-cubic-foot factor for its insulation — pick a radiator that keeps the room warm without waste
Heating Cost Calculator
Estimate what a heater costs to run from its power, hours per day, number of days, and your energy rate — compare space heaters and plan what heating will cost this winter
Heat Pump Sizing Calculator
Convert your home's design heat loss into the heat-pump capacity you need, in kilowatts and refrigeration tons — so you size to the load instead of guessing and oversizing
Room Volume Calculator
Find a room's floor area and air volume from its length, width, and ceiling height — the cubic-foot figure you feed into radiator and heater sizing to warm the room properly