Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Construction
Insulation R-Value Calculator
Compute the total thermal resistance (R-value) of an insulation layer from its thickness and material-specific R-value per inch. Useful for meeting energy-code targets in walls, attics, basements, and floors.
Fill in the required fields to see your result.
Construction
HVAC BTU Calculator
Estimates the BTU per hour needed to heat or cool a room based on its size, ceiling height, and insulation quality. Use it to size an air conditioner, heat pump, or furnace before purchasing.
Fill in the required fields to see your result.
Key differences
| Insulation R-Value Calculator | HVAC BTU Calculator | |
|---|---|---|
| Category | Construction | Construction |
| Inputs required | 2 | 3 |
| Result | Total R-Value (R) | BTU Required (BTU/hr) |
| What it does | Compute the total thermal resistance (R-value) of an insulation layer from its thickness and material-specific R-value per inch. Useful for meeting energy-code targets in walls, attics, basements, and floors. | Estimates the BTU per hour needed to heat or cool a room based on its size, ceiling height, and insulation quality. Use it to size an air conditioner, heat pump, or furnace before purchasing. |