Apply for financingBTU calculator
This BTU calculator converts watts to BTU per hour, or tons of cooling to BTU per hour. The area mode multiplies square feet by a BTU-per-square-foot number you type. That factor is not a room-by-room load.
Heat equivalent
5,118BTU/h
Unit conversion, plus an optional area times a BTU-per-square-foot figure you enter. It is not a Manual J load calculation.
How it works
A watt-hour converts at 3.412141633 BTU. Tons convert at 12,000 BTU per hour per ton. Both are definitions, not estimates. The area mode is different. It multiplies the square feet by whatever BTU per hour per square foot you enter. The field starts at 20 so an example appears. Twenty is not a Manual J result and not a rule for a climate. Use the conversion modes when you already know watts or tons. Use the area mode only as a sketch, and say so when you repeat the number.
Formula
The area path is square feet times your factor. Tons from that result are the BTU per hour divided by 12,000. The page labels that path as planning, because the factor is not a load calculation.
Example
1,500 watts is about 5,118 BTU per hour, or about 0.43 tons. Switch to tons and 1.5 tons is 18,000 BTU per hour. The area example of 400 square feet at 20 BTU per hour per square foot is 8,000 BTU per hour, and that 20 is only the number in the field.
Tips
Insulation, windows, and ventilation change the load. The insulation calculator and the CFM calculator answer those pieces separately. They still are not a full load. A supplier's Manual J, or the equivalent you use, is the design.
Equipment
HVAC equipment from $15,000 to $2 million can be an equipment application with Dengaro. The BTU figure is not an offer and not the amount financed unless you later enter the equipment price yourself.
Important questions
12,000 BTU per hour. A 1.5 ton unit is 18,000 BTU per hour. That conversion does not say the building needs 1.5 tons.
About 3.412141633 BTU per hour for each watt. 1,500 watts is about 5,118 BTU per hour.
It is square feet times a factor you typed. Climate, glass, and insulation are not in that multiplication. The default 20 exists so the field is not blank.
Divide BTU per hour by 3.412141633. The watts line on the ton and watt modes is that conversion.
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