Free, takes about a minute, no signup
See how much you could save on your energy bills
A free UK calculator that tells you, in plain English, how much you could save with solar panels, a battery, a heat pump, or an electric car. Personal to your home. No jargon. No hard sell.
Results in under two minutes
Solar panels
Save up to £1,000/yr
Home battery
Cheap night-rate use
Heat pump
£7,500 grant included
EV charger
Save vs petrol
Why use this calculator?
Most green home calculators look at one upgrade at a time. This one shows you the full picture for your home, so you can stop guessing and start saving.
Save real money
See your year-one savings, your total saving over 15 or 25 years, and exactly when you break even.
Personal to your home
Postcode-level sunshine data, your heating type, your driving distance, your insulation.
What to do, in what order
Solar first? Heat pump first? You will see, with clear reasons.
How it works
Four short steps. About a minute of your time.
- 1
Tell us about your home
Postcode, type, heating, insulation.
- 2
Pick what you are weighing up
Solar, battery, heat pump, EV. Any combination.
- 3
See your numbers
Savings, costs after grants, payback year.
- 4
Read the guides if you want more
Plain English, no sales talk.
Honest by default
You see the full answer, even when it is "not yet"
If a heat pump would not save you money in your home right now, the calculator says so. If solar pays back faster than a battery, the calculator tells you. The numbers are conservative and the assumptions are all published openly on the methodology page.
Common questions
Is the calculator free to use?+
Yes. Free, no sign up, no email gate. You see the full numbers straight away.
How accurate are the savings?+
The maths uses live Ofgem energy prices, MCS installer costs, government grant rules, and Department for Energy data. Real quotes vary by installer. Always get three quotes before you commit.
Will solar panels save me money?+
For most south or south-west facing UK homes, yes. The calculator works out your savings using your postcode-level sunshine data. Most homes break even in 7 to 10 years.
Is a heat pump worth it for my home?+
It depends on your current heating fuel and how warm your home stays. The calculator gives you a clear yes or no, and tells you why. The £7,500 government grant is included.
What if I cannot afford an upgrade right now?+
You will still get the numbers. Many people use the calculator to plan upgrades over 5 or 10 years, doing one at a time. The order matters, and the calculator tells you what to do first.