BTU Calculator

How many BTU’s do I need to heat my room or even my whole house?

This is a very common question that you need to answer based on your specific needs before considering the size and type of wood stove, pellet stove, gas stove, fireplace or fireplace insert to purchase.

Our BTU calculator has been built for zone heating in North America, not for central heating systems. Fireplaces, stoves and inserts are considered ‘zone heaters’ as they radiate and circulate heat from a central point. Most times, the goal with a fireplace is to heat one room or a portion of the home. In some cases, homeowners may use their fireplace or stove to heat their entire home, but it will typically mean that the room where the fireplace is will be very warm and that the room the furthest away from the fireplace will be cooler.

There are a few BTU calculators found online. Most relate to either central heating systems or air conditioning. Our BTU calculator is the best there is for fireplaces, stoves and inserts. It has been developed by experts who work in the fireplace industry.

Only 9 easy steps and you will get a good idea of the range of BTU needed, which will guide you toward a category of products to look at. Once you have your results, make sure to involve a local We Love Fire Local Partner to validate that the choice you are making in selecting your fireplace truly reflects your need.

Find a Local Expert

Get the BTU’s range you need in a few easy steps.

Climate Zone – BTU Calculator We Love Fire

Where do You Live?

Choose from:

Click on the map for to enlarge.

Unit of Measure - Calculatrice BTU Passion Feu

Choose between Metric or Imperial Measures?

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What Type of Room Are You Trying to Heat – BTU Calculator We Love Fire

What are You Trying to Heat?

Year of Construction – BTU Calculator We Love Fire

Was Your Home Built Before or After 1990?

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How Big an Area Do You Want To Heat - BTU Calculator We Love Fire

How Big an Area Do You Want to Heat?

W x L x H

*If your home has cathedral ceilings, enter the highest point.

Type of Area Below the Room to Heat - BTU Calculator We Love Fire

What is Below the Room?

Type of Area Above the Room to Heat - BTU Calculator We Love Fire

What is Above the Room?

Type and Size of Windows - BTU Calculator We Love Fire

Are Your Windows...

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Window Area:

Enter the number of windows in the room or whole house*.
The assumption is that the average window area is 8 square feet (or 0.7 square meter). If you have patio sliding doors, each panel should count as one window.
*If your intent is to heat the whole house.

Number and Material of Outer Walls - BTU Calculator We Love Fire

How Many Outer Walls Are There?

What are the Outer Walls Made of?


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