This calculator allows you to compare the cost of heating you're house with different wood fuels instead of oil. Start by inputting how much oil you use per year and the best price per litre you think you can get in the yellow boxes. Then adjust the price you pay for wood fuel. If your buying your logs remember that a "load" isn't a tonne. We've found that a £40 load of decent dry logs varies from £124-£309 per tonnes when you actually weigh them!