WattPeekWhat does it cost to run?
Choose an appliance, set your rate, see the cost.
1Choose an appliance
More appliances
Example values only. Replace with your own usage.
2Usage & rate
ESTIMATED RUNNING COST
Live estimateEnter your usage and electricity price.
Energy breakdown
A little perspective on what you use.
Combine appliances to estimate your total cost.
Explore a lower-use scenario
See the estimated saving from using this appliance less.
Assumes the same daily usage throughout the year.
Household overview
Add appliances to see their combined cost and which contribute the most.
No appliances added yet. Your list is saved on this device when browser storage is available.
Understand each appliance.
Useful starting points. Always replace examples with your own measurements.
A little clarity, by the kilowatt.
Your electricity unit price and how much energy you use determine the running cost. WattPeek makes that calculation visible.
(watts ÷ 1,000) × hours × price per kWhExample: 1,000W × 2 hours at 0.25 per kWh = 0.50 per day. This is an illustration, not a current tariff.
Fixed daily charges are excluded. Average power, active time, taxes, tariff tiers and time-of-use rates can affect your actual bill. For variable rates, calculate each rate period separately.
Frequently asked questions
Where do I find my electricity price?
Look for the unit price per kWh on your bill or supplier account. Enter it in whole currency units, including applicable per-unit taxes. Do not enter your monthly bill or fixed standing charge.
Are the appliance presets accurate?
Presets are illustrative starting values, not measured averages or manufacturer specifications. Actual draw varies. Use your manual, energy label or a plug-in meter to replace them.
What if an appliance switches on and off?
Use average measured power with active time at 100%, or use measured kWh. If you know the duty cycle, you can instead enter its on-state power and active-time percentage. Do not reduce both.
Is WattPeek really free?
Yes. All calculator features work without payment or an account. There are no paid APIs, trackers or subscriptions in this version.
Do you collect my calculations?
No calculations are sent to a server by the app. The appliance list uses browser storage. A shared link contains its calculation inputs, so only send it to people you want to see them.