Greenhouse Heating Calculator
Estimate heating power for a greenhouse from size and temperature gap.
Quick answer: enter your details below and click Estimate Heating Power — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Enter your values in the fields provided.
- Click Estimate Heating Power.
- Read the result and adjust an input if you want a different outcome.
About this tool
A greenhouse heater must replace the heat lost through its air and surfaces. Enter the greenhouse size and the inside-outside temperature gap, and this tool estimates the watts needed with a simple volume-based rule. This is an estimate for planning, not a heating engineer's specification.
Frequently asked questions
What do I enter to get a result?
Fill in every field with your own numbers or choices, then run the tool. Empty number fields count as zero, so check them before you trust the output.
Can I reuse this result elsewhere?
Yes. The result is calculated in your browser from the values you entered, so you can copy the numbers into your own notes or plan.