2026 Edition · Updated monthly

Know exactly what electricity really costs you.

Free calculator, wattage database of 300+ appliances, and no-nonsense guides to cut your bill in the US, UK, and Europe.

300+Appliances
5Countries
$0Free, always

Quick cost check

Change any value to recalculate.

$22.95/mo Estimated monthly cost at 30 days of use
Wattage reference

How many watts does a common appliance use?

Typical power draw and monthly cost at the US average rate (17¢/kWh, 3 hours/day).

❄️

Refrigerator

150 W~$22 / month
🌬️

AC (window)

1,000 W~$153 / month
🔥

Space heater

1,500 W~$230 / month
💧

Water heater

4,000 W~$612 / month
📺

TV (55" LED)

100 W~$15 / month
🎮

Gaming PC

400 W~$61 / month
💻

Laptop

60 W~$9 / month
🔌

EV charger (L2)

7,200 W~$110 / session
🧺

Washing machine

500 W~$8 / month
🍽️

Dishwasher

1,800 W~$28 / month
🍞

Oven

2,400 W~$37 / month
💡

LED bulb

10 W~$0.15 / month
Why Watt Guide

Built for real households, not spreadsheets

Multi-country, multi-currency

US, UK, Ireland, Canada, Australia. Pick your country — we load a realistic 2026 rate automatically and convert every calculation.

No tracking, no spam

No signups. No email gates. Calculator works offline once loaded.

Always free

Funded by unobtrusive ads. No paywalls, no affiliate pressure on our recommendations.

Updated for 2026 rates

We refresh country-average tariffs every quarter using EIA (US), Ofgem (UK), Eurostat and CRU (Ireland) public data.

Works on any device

Mobile-first. The whole site loads in under 1 second on a 4G connection.

Public-data sourced

Every number tied to EIA, NREL, DSIRE, Ofgem or a manufacturer spec sheet. If we can't source it, we don't print it.

Latest guides

Read before you pay your next bill

Reference

How many watts does an air conditioner use?

Window, portable, central, mini-split — real wattage numbers by BTU rating and what they cost per hour.

Coming soon
EV

Cost to charge an EV at home vs public stations

Level 1 vs Level 2 vs DC fast charging. Real kWh math for Tesla, Mach-E, Ioniq and Leaf.

Coming soon
Solar

What size solar system do I actually need?

Sizing formula based on your last 12 months of kWh usage. Panel count, inverter size and break-even period.

Coming soon
Heating

Heat pump vs gas furnace vs electric: true operating cost

Monthly heating cost for a 2,000 sq ft home in cold, mild and warm climates.

Coming soon
Standby

Phantom load: how much do "off" devices really cost?

We measured 40 plugged-in devices. Some cost more off than on. Here's what to unplug first.

Coming soon

Ready to cut your bill?

Plug your main appliances into the calculator and see where the real money goes. It takes 60 seconds.

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