Wood Burning Stove Size Calculator: What kW Stove Do I Need?

The most common mistake when buying a wood burner is going too big. An oversized stove forces you to run it slow and starved of air, which glazes the glass, tars up the flue and burns inefficiently. This calculator sizes the stove to your room, not to your ambitions. Enter your room and we will estimate the heat output in kilowatts you actually need.

The rule of thumb the trade uses is that a reasonably insulated room needs roughly one kilowatt of stove output for every fourteen cubic metres of space, adjusted up for draughty old homes and down for modern airtight ones. This tool follows that logic but lets you tune it to your actual room. Treat the figure as a target, then choose a stove whose nominal output sits close to it rather than well above it.