Gas Rate Calculator UK 2026

Multiply your metric units (m³) by a volume correction (1.02264) and the calorific value (about 39.5), then divide by 3.6 — roughly ×11.2. Imperial meters read in hundreds of cubic feet, which convert to m³ first. This gas rate calculator does the full conversion and applies the unit rate.

Under the Ofgem Q3 2026 price cap the average gas unit rate is 7.33p per kWh with a 29.04p daily standing charge. The cap is reviewed quarterly; your supplier's exact rate is on your bill.

Meters measure the volume of gas, but you're billed for the energy it contains. Your supplier converts cubic metres to kilowatt-hours using the calorific value of the gas supplied that period, which is why the same units can cost slightly different amounts month to month.

Take two meter readings, convert the difference to kWh with this calculator, multiply by your unit rate and add the standing charge for the days between. It should match your bill closely — if it's far off, query it with your supplier.