๐ Household
Patio Heater BTU Calculator
Outdoor heating is far harder than indoor because the heat escapes sideways instead of being trapped. The number that matters is the temperature lift you want above ambient, and wind can increase the requirement by more than half.
How it works
Patio area
Effective height to heat
Temperature lift wanted
Shelter from wind
Heater type
Output per heater
Hours used per week
Total BTU per hour needed
Heaters required
BTU per square foot
Fuel used per hour
Approximate cost per season
Coverage per heater
Frequently asked questions
How do I use the Patio Heater BTU Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.