🔥 Gas Units → kWh Converter

Convert meter readings (m³/ft³) to kWh and cost — the exact UK billing formula

units
p/kWh
Check your bill — price cap ~6.3p/kWh (2025)

Your Gas Usage

Energy Used—
Cost—
Formula Appliedunits × 1.02264 × 39.5 ÷ 3.6
Uses the standard UK billing formula: volume correction 1.02264 and average calorific value 39.5 MJ/m³. Your bill may use a CV between 37.5–43.0.

Why Gas Meters Don’t Show kWh

Gas meters measure volume (cubic metres or cubic feet), but you’re billed for energy (kWh). Suppliers convert using: m³ × 1.02264 (volume correction) × calorific value (~39.5) ÷ 3.6 = kWh. Imperial meters measure in hundreds of cubic feet — multiply by 2.83 to get m³ first.

Checking Your Bill

Take two meter readings a month apart, run the difference through this converter with your unit rate, and compare with your bill. Estimated bills drift — submitting actual readings monthly keeps your account accurate.

Typical Usage

Ofgem’s typical medium-use household burns ~11,500 kWh of gas per year — about £725 at 6.3p/kWh. Heating dominates: expect 70–80% of annual gas use between October and March.

Frequently Asked Questions

How do I convert gas units to kWh?

Multiply cubic metres by 1.02264, then by the calorific value (about 39.5), then divide by 3.6. 100 m³ is roughly 1,122 kWh.

My meter is imperial — what do I do?

Imperial meters record hundreds of cubic feet. Multiply the units by 2.83 to get cubic metres, then apply the standard formula.

What is a typical annual gas usage?

Ofgem's typical medium household uses about 11,500 kWh of gas per year, with 70–80% consumed in the heating season.