Gas Usage Calculator UK
Use our free gas usage calculator to find out exactly how much your gas heating, hot water and cooking costs. The calculator is pre-loaded with the current Ofgem price cap gas rate of 6.76p per kWh and standing charge of 31.65p per day, so you get an accurate estimate straight away. You can enter your usage in kWh or cubic metres and select a daily, weekly, monthly or annual period.
Gas typically accounts for around 60% of a UK household's energy bill, with the average home using roughly 12,000 kWh per year. Knowing your gas costs helps you budget more effectively and spot opportunities to save, whether that means improving your boiler efficiency, insulating your loft or switching to a fixed-rate tariff. If you read your gas meter in cubic metres, our calculator converts automatically using the standard 11.1868 multiplier so you do not need to do the maths yourself.
Understanding UK Gas Prices and the Ofgem Cap
The price you pay for gas in the UK is regulated by Ofgem through its quarterly energy price cap. This cap limits the maximum unit rate and standing charge that suppliers can charge households on standard variable or default tariffs. As of April 2026, the gas unit rate is capped at 6.76p per kWh and the daily standing charge at 31.65p. If you are on a fixed-rate deal, your rates may differ. You can check the latest cap figures on the Ofgem price cap page.
How to Read Your Gas Meter
Most modern UK gas meters display usage in cubic metres (m³). To convert cubic metres to kWh, the industry-standard method is to multiply by the volume correction factor (1.02264), then by the calorific value (roughly 40), and divide by 3.6. A simplified approximation is to multiply cubic metres by 11.1868. Our calculator handles this conversion for you when you select the cubic metre input option.
Taking regular meter readings rather than relying on estimated bills is one of the easiest ways to stay in control of your gas spending. It also helps you spot any unusual spikes in usage that could indicate a faulty boiler or poor insulation.
Ways to Cut Your Gas Costs
Central heating accounts for roughly 80% of household gas use, so improving heating efficiency delivers the biggest savings. Insulating your loft and cavity walls, bleeding radiators, servicing your boiler annually and lowering your thermostat by just one degree can all reduce consumption without sacrificing comfort. For a detailed comparison of heating methods and their costs, try our heating cost calculator. You can also explore whether solar panels could offset some of your hot water heating costs over the long term.