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Wondering how much 100 units of gas costs in the UK? Or perhaps you need to know the price of 300, 500 or 1,000 units? Use our quick reference table below or enter any number of units into the calculator to get an instant cost breakdown at the current Ofgem price cap rates, including standing charge and 5% VAT.
Based on the current Ofgem price cap rate of 6.24p/kWh unit rate and 31.43p/day standing charge, with 5% VAT applied. Assumes a 30-day billing period.
| Units (kWh) | Unit Cost | + Standing Charge (30 days) | Total inc. VAT (5%) |
|---|---|---|---|
| 50 | £3.12 | £12.55 | £13.18 |
| 100 | £6.24 | £15.67 | £16.45 |
| 150 | £9.36 | £18.79 | £19.73 |
| 200 | £12.48 | £21.91 | £23.00 |
| 300 | £18.72 | £28.15 | £29.56 |
| 400 | £24.96 | £34.39 | £36.11 |
| 500 | £31.20 | £40.63 | £42.66 |
| 750 | £46.80 | £56.23 | £59.04 |
| 1,000 | £62.40 | £71.83 | £75.42 |
Highlighted rows (100 and 300 units) are the most commonly searched amounts.
Enter any number of gas units (kWh) and the billing period length to calculate the total cost at current Ofgem rates.
Rates: Ofgem price cap — 6.24p/kWh unit rate, 31.43p/day standing charge, 5% VAT on domestic gas.
On your energy bill, 1 unit of gas equals 1 kilowatt-hour (kWh). Your gas meter measures the volume of gas consumed (in cubic metres or cubic feet), which your supplier then converts to kWh using the calorific value and a volume correction factor. The kWh figure is what you are charged for.
Total Cost = (Units × Unit Rate) + (Days × Standing Charge) + 5% VAT
Unit Rate
6.24p/kWh
Standing Charge
31.43p/day
VAT
5%
The Ofgem energy price cap sets the maximum unit rate and standing charge that suppliers can charge customers on default tariffs. It is reviewed every three months, meaning the cost of gas units can change in January, April, July and October each year.
Your gas bill has two components. The unit rate (currently 6.24p/kWh) is charged per kWh of gas used. The standing charge (currently 31.43p/day) is a fixed daily fee you pay regardless of usage — it covers maintaining the gas network, your meter, and billing services. Even if you use zero gas, you still pay the standing charge.
Gas prices vary slightly across different regions of the UK. The rates on this page reflect the national average under the Ofgem price cap. Your actual unit rate may be marginally higher or lower depending on which gas distribution network serves your area.
While the price cap limits what suppliers can charge on standard variable tariffs, fixed-rate deals may be priced above or below the cap. Shopping around or switching to a competitive fixed tariff could change what you pay per unit. Check Ofgem's website for guidance on switching suppliers.
Understanding typical consumption helps you judge whether your gas usage is normal. Here are Ofgem's benchmarks for annual and monthly gas consumption by property size.
| Property Type | Annual Usage (kWh) | Monthly Average (kWh) | Est. Monthly Cost |
|---|---|---|---|
| Small flat / 1-bed | 8,000 | ~667 | £53.60 |
| Medium house / 2-3 bed | 12,000 | ~1,000 | £75.42 |
| Large house / 4+ bed | 17,000 | ~1,417 | £102.74 |
Monthly costs include standing charge (30 days) and 5% VAT at current Ofgem rates. Actual usage varies seasonally — winter months are significantly higher than summer.
Estimate your monthly, quarterly or annual gas bill from kWh usage.
Calculate your gas bill directly from kWh consumption figures.
Convert gas meter units (m³ or ft³) to kWh for billing purposes.
Calculate gas usage and cost from your meter readings.
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