Understand
Use a plain-English guide to understand the questions that matter before you spend money.
UK home energy, clearly explained.
See what energy choices mean for your whole home.
Bills, solar, batteries, EVs, tariffs and heating all affect one another. Home by Numbers connects them using your figures, so you can see what could cost, save and genuinely matter.
- Free guides, calculators & Decision Packs
- No account needed
- No phone number
- No sales calls from us
Your home isn’t a collection of separate energy decisions.
Your electricity price changes the value of solar, batteries and home EV charging. Heating can transform your electricity demand, and all of those choices can change which tariff works best.
Change one number. See what it changes elsewhere.
Shared figures connect My Energy, Solar, Battery, EV, Heating and Tariff comparisons, so you can see how one choice affects the rest of your home.
From question to decision.
Start wherever you are. Home by Numbers connects the explanation, the calculation and the next step.
Calculate
Use your own figures to test costs, savings, payback and the assumptions behind them.
Decide
Turn a result or real quote into a free Decision Pack with comparisons, assumptions and questions to ask.
Take the next step
When you’re ready, move on to practical next steps or clearly labelled providers — always on your terms.
What would you like to understand?
Start with one question. Everything you’ve already entered can follow you into the next tool.
My Energy
Understand where your money goes and what every 1p change means to your household.
Understand my billsSolar
Estimate generation from your location and roof, then see bill savings, export income and payback.
Explore solarBattery
See what a battery could really save after charging losses and export income are accounted for.
Explore batteriesEV and plug-in hybrid
Compare petrol or diesel with your real charging mix, including cheap-rate and surplus-solar charging.
Explore EVsHeating
Compare how changing the way you heat your home could alter both your fuel use and electricity demand.
Compare heatingTariffs
Understand how different unit rates, standing charges and charging periods could affect your whole home.
Compare tariffsGot a quote? Or a question?
Two common starting points — both free, both using your own numbers.
Already have a quote?
Check a solar quote step by step. Enter the quoted price, generation and rates to see the annual benefit and simple payback — and how HBN would judge it.
Are solar panels worth it?Answers that explain themselves.
Examples of the kind of insight Home by Numbers helps you uncover — not results for your home.
See what every 1p change is worth over a year
Estimate solar generation using your location and roof
Value stored solar after accounting for export income
Compare an EV using where you would actually charge it
See the performance a heat pump would need to beat your present heating cost
See how a tariff change could affect your wider home
Your results are calculated from your figures, with the assumptions and limitations shown beside them.
Numbers first. Commercial links second.
Home by Numbers is designed to give you the calculation before asking you to take any action. We don’t change a result to favour a product or provider. If you choose to use a clearly marked partner link to switch or request a quote, we may earn a commission. That helps keep the core Home by Numbers free to use.
- No result hidden behind contact details
- Assumptions you can inspect and change
- Honest answers when an option may not be worthwhile
Understand your home one number at a time.
Begin with your current electricity and gas figures. You can explore everything else from there.
No account required. Your figures are stored on this device.