KiloWiseAudit your bill
Enter kWh, rate and standing charge. Get a ranked plan — which fixes pay back first.
Independent · US · UK · Canada · Australia
Your energy bill, explained — then lowered.
Most of your bill is three things: heating and cooling, hot water, and the devices left on. Find out which one is costing you the most — then fix it in payback order, not guesswork order.
Start with the bill audit — free
2 minutes · No account · Nothing leaves your browser
- Independent — no utility, no installer, nothing sold
- Estimates only — every figure shows its formula
- Dated rates — checked 5 Nov 2026
Heating & cooling ≈ half a typical bill (ENERGY STAR). Water heating ≈ 18% (US DOE). Standby 5–10% (EnergySage, Aug 2026). Your home will differ — the audit uses your numbers.
Start here — in order
Three steps, in the order that pays. Most people only need the first one.
Free fixes first
Twelve savings that need no landlord permission and cost nothing to start.
Renters start here
What you can do in a rented home — and what to ask your landlord about, with numbers.
The tools
Free, in your browser, no account. Every tool asks your country first, shows its formula, and labels every result an estimate. Nothing here is a guaranteed saving.
Free tool · No account
Whole-home bill audit + savings planner
Enter your bill — kWh, rate, standing charge — and get a ranked plan: which fixes pay back first, in money and months. The appliance breakdown is inside it.
Free tool · No account
Thermostat setback simulator
How much is a lower thermostat worth? Uses the US Department of Energy rule: a 7–10°F setback for 8 hours a day can save up to 10% of heating and cooling costs a year.
Free tool · No account
Insulation / draught-proofing payback checker
Enter your quote and your estimated annual saving. It ranks fixes by payback — shortest first — and shows the 5-year net.
Free tool · No account
Standby-power estimator
List the devices left on standby, with watts from their labels, and see what they cost a year.
Guides
Twelve guides, each with the working shown — the formula, the assumptions, and what to check before you spend.
Guide · Bills & Tariffs
How to read your energy bill (kWh, rate, standing charge)
What is kWh on my bill; energy bill standing charge explained; how to find my electricity rate
Guide · Bills & Tariffs
The whole-home energy audit: a room-by-room checklist
whole home energy audit; room by room energy audit; how to audit your home energy use
Guide · Heating & Cooling
Thermostat settings that actually save money
best thermostat temperature winter; thermostat setback savings; what temperature to set heating
Guide · Insulation & Draughts
Draught-proofing: the cheapest fixes first
cheapest draught proofing; draught excluder doors windows; how to find draughts in your home
Guide · Insulation & Draughts
Insulation: what pays back first (loft, walls, floor)
loft insulation savings; wall insulation cost payback; floor insulation worth it
Guide · Lighting & Appliances
Standby power: how much it really costs
phantom load cost; vampire power electricity bill; should I unplug appliances
How this site works
Independent
KiloWise is not a utility, retailer, or installer, and it does not sell anything.
Estimates only
Every figure is an estimate based on the assumptions shown next to it — verify on your bill before you spend.
Dated rates
Every rate carries its date and source; the rate table is in Resources and is re-checked annually (the UK Ofgem cap quarterly). The US residential average stored here is 18.19 cents/kWh, Jan–Jul 2026 (US EIA). No verified average is stored for the UK, Canada or Australia — those tools ask you to enter your own rate.