Calculate Your Heater Size

Use the calculator below to quickly estimate the heating requirements for a single room.

(Tried the calculator but feeling unsure? Click here to get a free, expert quote and heating plan directly from our team.)

Calculate Your Heater Size

Use the calculator below to quickly estimate the heating requirements for a single room.

(Tried the calculator but feeling unsure? Click here to get a free, expert quote and heating plan directly from our team.)

Save Your Estimate to Email

Enter your email to receive your room specs, recommended wattage and radiator configuration.

Room Details

Enter the length and width of your room in metres, or click Enter Room Area Manually to enter the total area of your room in square metres.

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M2
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Windows

Tell us about your windows and glass doors. Choose from the size dropdown or manually enter the window area for the most accurate calculation.

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M2

External Walls & Doors

You can enter the number of external walls in your room, or enter the total length of your external walls for a more accurate calculation.

What is an external wall?

External walls are any that connect to the outside or a cold space such as a garage. If you share a wall with a neighbour, this does not count as an external wall. We recommend manually entering the exact length of your external walls for the most accurate calculation

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Enter the total number of standard external doors (if any). If you have glass sliding doors, include these in your window measurements instead.

Room Insulation

Select which description best describes the insulation in your room for each interior surface. If you know the exact insulation value (often found in home energy efficiency reports), enter it into the column on the right.

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Get a Free Expert Heating Plan & Quote

Ideal for Multiple Rooms or Whole Home

Our expert estimators will run the numbers and calculate your exact heating needs.

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