This calculator is offered as a means of converting heating oil price per litre to price per kWh so that prices can be compared with that for other fuels such as gas, electricity or wood (using our Wood Fuel Cost Calcutator ).


Total cost £{{HeatingOil.totalCost_VIEW}}
Cost {{HeatingOil.cost_VIEW}} pence per kWh
Energy {{HeatingOil.energy_VIEW}} kWh
Starting price: {{HeatingOil.priceSource}}. Energy content: {{HeatingOil.kwhPerLitreSource}}.

Calculation for working out factor to convert litres of heating oil into kWh / litre

  • Heating oil provides 138,500 British thermal units (BTU) per US gallon
  • 1 BTU = 0.000293 kWh
  • 1 US gallon = 3.78541178 litres
  • (138,500 * 0.000293)kWh in 3.78541178 litres
  • (138,500 * 0.000293)/3.78541178 kWh/litre
  • = 10.720233982047786621512547837002
  • rounded to 10.720233 kWh/litre

The calculator now uses the DESNZ gross calorific value of burning oil from the RenSMART Fuel Factors service and the latest UK price from the Heating Oil Price service (DESNZ Quarterly Energy Prices table 4.1.1, inc VAT). The working above is the earlier estimate, kept for reference.

Source: DESNZ greenhouse gas conversion factors (fuel properties), DESNZ heating oil prices, earlier estimate Wikipedia - Heating Oil