Home Heating Cost Calculator Home Heating Cost Calculator Estimate your monthly and annual heating costs. * Enter values in U.S. customary units.Step 1: Enter Your Data Home Area (ft²): Heating Load (BTU/ft² per month): System Efficiency (%): Fuel Cost ($ per 100,000 BTU): Calculate Heating Cost Cost EstimationMonthly Heating Cost:Annual Heating Cost: New Calculation Share: