Know what your business energy bill should be.
Our free calculator turns your meter readings and unit rates into an itemised estimate — energy, standing charge, CCL and VAT.
So you can budget for the year ahead, sense-check what you’re paying, and hold your supplier’s next bill up to the penny. About two minutes, no sign-up.
- ★★★★★ Rated Excellent on Trustpilot
- 11+ years
- No sign-up
Three steps to a bill you can check.
No jargon, no sign-up. With a recent bill to hand, you’re about two minutes from an itemised estimate of your own.
- 1
Enter your readings & rates
Two meter readings, plus the unit rate and standing charge from your latest bill. Electricity, gas, or both.
- 2
See it itemised to the penny
We work out energy, standing charge, CCL and VAT — and show the maths, so you know exactly where the number comes from.
- 3
Keep it and compare
Email yourself the estimate. When your supplier’s bill lands, check it lines up — and if it doesn’t, we’ll help you find out why.
Keep this estimate — then check it against your real bill
Every figure is based on the readings and rates you entered. When your supplier’s invoice arrives — often built on estimated readings — compare it against this. If anything looks off, send it to us and we’ll help explain why.
- The total is roughly in line
- The units used match
- The meter readings are actual, not estimated
Estimates are a guide only, based on the figures you enter. Standard business supplies include the Climate Change Levy (CCL) at 0.801p/kWh and 20% VAT. A reduced 5% VAT rate (and CCL exemption) applies to qualifying supplies — registered charities and non-profits using energy for non-business purposes, and very low-usage supplies. Gas meter units are converted to kWh using the standard industry formula. Figures exclude any contract-specific discounts. Smart Energy Company is an independent energy broker.
This is what you’ll get.
Enter your readings and rates, and the calculator lays your bill out in full — energy, standing charge, CCL and VAT, down to the penny . A clear estimate you can read at a glance and check the real bill against. About two minutes, no sign-up.
Try it with your figures
Your questions, answered.
It gives a close estimate from the readings and rates you enter, using the standard UK formulas — the Climate Change Levy at 0.801p/kWh, VAT at 20% (or 5% for qualifying supplies) and the industry gas conversion. Your actual bill can vary slightly for rounding, any contract-specific discounts, or if your supplier has billed on estimated rather than actual readings .
It’s a government tax on business energy use, currently 0.801p per kWh for both electricity and gas in 2026/27, rising to 0.827p in April 2027. Registered charities and very low-usage supplies can be exempt. The calculator adds it automatically on standard supplies.
Most businesses pay 20% . A reduced 5% rate — and CCL exemption — applies to registered charities and non-profits using energy for non-business purposes, and to very low-usage supplies. Pick the rate that matches your supply at the start of the calculator.
Both are printed on your latest energy bill — the unit rate in pence per kWh, and the standing charge in pence per day. Your meter readings come from the meter itself, with the earlier reading from a previous bill.
Gas meters read in cubic metres (m³) or imperial units, but you’re billed per kWh. The calculator converts it for you: m³ × 1.02264 × 39.5 (calorific value) ÷ 3.6 , with imperial units multiplied by 2.83 first. It shows the working so you can see exactly how it’s done.
Yes. It handles single-rate or Economy 7 electricity, gas in cubic metres, imperial or kWh, or electricity and gas together in one estimate.
No. Your figures stay in the calculator unless you choose to email yourself the estimate or request a rate review — only then do they reach us.
Yes — completely free, with no sign-up. We’re an independent, whole-of-market energy broker; if you’d like, we can compare your current rates against the market, but there’s no obligation.
Still not sure about something? Talk to an adviser — a real person, no call centre.
Know the bill before it lands.
Two minutes with your meter readings, and you’ll know what to expect — no more opening the envelope and hoping.
Think your last bill looked high? Let’s take a look.
Send us your latest bill or your current rates and we’ll tell you plainly whether you’re paying over the odds — and what we can do about it. Whole-of-market, no obligation.
