Enter your energy bills. XeroCalc multiplies them by DEFRA factors and exports your Carbon Reduction Plan. From £29/month.
Every carbon consultant and every enterprise platform does the same thing: multiplies your energy bills by a free government spreadsheet.
The DEFRA factors are free. The maths is multiplication.
| Provider | Annual cost |
|---|---|
| Persefoni | £41,000 – £187,000 |
| Plan A | £10,000 – £50,000 |
| Greenly | £5,000 – £20,000 |
| Carbon consultant | £2,000 – £5,000 per report |
| XeroCalc | £348 – £948 |
How it works
Energy bills, fuel receipts, fleet mileage, waste, water, travel — type the numbers from invoices you already have.
Every input is multiplied by the correct DEFRA 2025 conversion factor. Every factor cited, every calculation auditable.
Download a branded PDF Carbon Reduction Plan formatted for PPN 06/21, SECR, or client requirements.
Every number is transparent — every factor cited, every calculation auditable.
14-day free trial on all plans. No credit card required.
Starter
Scope 1 + 2 for a single entity
Professional
Full scope coverage, multiple sites
Business
Enterprise needs at SME prices
Built on the same frameworks your auditor expects.
Every year, the UK Government publishes a spreadsheet of greenhouse gas conversion factors. Every carbon consultant and every enterprise platform takes your energy bills and multiplies them by those numbers. That's the entire service.
The DEFRA factors are free. The GHG Protocol is free. The methodology is public. The maths is multiplication. The only question is how much you want to pay for someone to do it.
XeroCalc makes the process transparent. Every conversion factor is cited with its DEFRA source. Every calculation is visible and auditable. No black boxes, no consulting fees, no lock-in.
A consultant will ask for your energy bills, fuel receipts and mileage data, multiply them by DEFRA conversion factors, and give you a PDF. XeroCalc does the same thing — except you keep the data, can update it any time, and pay a fraction of the cost.
No. XeroCalc is an operational carbon calculator — your company's emissions from energy, fuel, fleet, waste, water and travel. Embodied carbon (materials lifecycle analysis) is a different, much more complex discipline. We do one thing and do it well.
Directly from the UK Government's DEFRA Greenhouse Gas Reporting Conversion Factors, published annually by DESNZ. Every factor used in your report is cited with its exact DEFRA source reference.
Yes. The Business tier exports Carbon Reduction Plans in the format required for government procurement under PPN 06/21. The Professional tier includes SECR-formatted reports for Companies House.
Yes — all plans include a 14-day free trial with full access. No credit card required to start.
XeroCalc is built by a UK-based team focused on making carbon reporting accessible and affordable for construction companies.