The tools are for anyone who needs an energy or fuel figure quickly: a business owner checking a bill, a fleet manager setting mileage rates, or a writer who wants an official number with its source. They are free, need no sign-up and are listed on our free tools page.

The eight tools

  • GB electricity generation mix: what Great Britain's electricity is made from right now, the last 24 hours, each region and every month since 2009. Data: NESO's Historic GB Generation Mix (NESO Open Data Licence) and NESO's Carbon Intensity API (CC BY 4.0).
  • Electricity supplier fuel mix: each Northern Ireland supplier's fuel mix and CO2 per kWh by year, the UK average and residual mix, and a calculator for your own supplier's figure. Data: the Utility Regulator and DESNZ (Open Government Licence).
  • UK petrol and diesel prices: every weekly average pump price since 2003, with the cost and carbon of any amount of fuel. Data: DESNZ weekly road fuel prices (Open Government Licence).
  • Business electricity and gas prices: what businesses of each size pay per kWh, every quarter since 2004, with or without the Climate Change Levy. Data: DESNZ Quarterly Energy Prices (Open Government Licence).
  • HMRC advisory fuel rates calculator: the tax-free mileage payment for any quarter since 1 September 2024, and the carbon those miles add. Data: HMRC advisory fuel rates (Open Government Licence).
  • Electric vs petrol car: a year's running cost and CO2e for petrol, diesel, hybrid and electric cars of the same size. Data: DESNZ factors and pump prices, and HMRC's electric rates (Open Government Licence).
  • Flight emissions calculator: any flight by airports or distance, cabin and travellers, with or without radiative forcing. Data: DESNZ conversion factors (Open Government Licence).
  • Electricity grids ranked: every country's grid from cleanest to most carbon-intensive, by year. Data: Ember (CC BY 4.0), with government figures where one is open to reuse.

The tools use the same factor engine as our reporting app. To show why the grid matters: by NESO's figures, Great Britain's electricity averaged 459 g CO2 per kWh in 2009 and 130 g in 2025.

Embedding a tool on your website

Each embeddable tool has an "Embed this tool on your website" box at the foot of its page. Copy the code, which is an iframe plus a credit link back to the tool, and paste it into your page. "Preview the embedded tool" shows how it will look. Embedding is free; we ask that you keep the credit link.

The embedded version has no site menu, cookie banner or analytics, opens its links in a new tab and ends with a "Free tool by Carbon Recycling" line. Embedding works for 11 tools: the eight above, plus the Report check, the Climate Change Levy check and the electricity CO2e calculator. Those three gained embed code earlier the same day. On a translated tool page, the code embeds that language.

Journalists can find key figures, sources and credit lines on our press data page.