See what power and water really cost

Appliances
Ceiling Fan
0.00
per month
0.00
per day
0.00
per week
0.00
per year
hr
Tips & ideas
Tips
    Fine-tune Watts on the label
    From the sticker or manual. Cycling gear still uses “percent of time at full power” below.
    Only if you want a note for which breaker or room circuit this is on. Most people can skip this.
    How we calculated this Power, hours, and rate
    Usage estimate only — not a utility bill, load calc, or NEC design.
    About this estimate Tips and notes
    How this is calculated

    My Home
    Saved estimates for your household

    Download saves whatt-my-home-backup on this device. Restore picks that file — no cloud.

    Settings

    Preferences for this device

    Theme

    Language

    Length

    LED strips and similar (US default: feet).

    Temperature

    AC / heat cards (US default: °F).

    Rates

    Used for every cost. Bill rates are best.

    Solar

    Optional. Add each panel type (how many × watts). Whatt combines them into one system size and a simple monthly production estimate.

    Your data

    Saved on this device only.

    Set your rate
    Your bill is the most accurate. Area averages are a solid start.
    Your rate (type or edit)
    Privacy Policy

    This policy explains what Whatt does with information when someone uses whatt.net. Whatt is a free tool for estimating household power and water cost.

    On your device

    Settings such as utility rates, My Home items, theme, and recent selections stay on your device (local storage). Whatt does not require an account and does not run a user database that collects those settings from you.

    Optional location

    If you choose Use my location when setting a rate, the browser may share your browser-provided coordinates after you allow it. Whatt uses that only to suggest a ZIP or state for a typical area rate. Coordinates are not stored in a Whatt account. The lookup may send those coordinates to BigDataCloud and, if that fails, to OpenStreetMap Nominatim; those services process the request under their own policies. You can always type a ZIP or state instead and never share location.

    Email you send

    If you write to support@whatt.net, Whatt receives your message and the address you send from so a reply is possible. That information is used only to handle the request.

    Advertising and cookies

    Whatt uses Google AdSense to show ads. Third-party vendors, including Google, use cookies and similar technologies to serve ads based on prior visits to this site or other sites. Google’s advertising cookies help Google and its partners show ads based on visits across the web.

    To opt out of personalized ads, visit Google Ads Settings or aboutads.info/choices. More detail: Google Advertising.

    Hosting

    Whatt is hosted with Cloudflare. Cloudflare may process technical data (such as IP addresses and request logs) to deliver and protect the site, under Cloudflare’s own policies.

    Use of information

    Device settings are used only to run Whatt on that device. Email is used only to respond. Whatt does not sell personal information.

    Updates

    This policy may change over time. The current version will always be on this page; the version label in the footer may update when related changes ship.

    Contact

    support@whatt.net

    About Whatt

    Whatt is a free tool that helps you see what power and water actually cost at home—by appliance, fixture, and habit.

    It started from the kinds of questions that pop into your head at home and never get a straight answer. What does it actually cost to leave a fan on all day? Do a few extra flushes really show up on the water bill? And what about those warnings grandparents love—“stop flipping that light switch on and off, you’ll run up the bill”—as if the room were a strobe light?

    Those questions needed calm, simple numbers in one place. That’s what Whatt grew into.

    What it is

    A free estimator for home power and water. Use your own bill rate when you have it, or start from typical area averages. No account required—My Home and rates stay on this device.

    How it works

    Pick something you use, set how you use it, and Whatt shows a simple cost estimate. Optional “What if” ideas help you compare small changes. Everything runs in your browser.

    Disclaimer

    Whatt provides educational estimates only. These figures are not a utility bill, a quote from a provider, or financial advice. Real bills depend on the utility, plan, fixed fees, taxes, rate tiers, and how energy and water are actually used.

    Private by design

    Your My Home list and rates stay on this device. See Privacy for advertising and cookies.

    Donate

    Whatt is free to use. If you’d like to help keep it free and improving, you can donate.

    Help

    How Whatt works, two short guides for reading bills and everyday habits, and common questions. Appliance-specific tips still live on each item’s estimate screen.

    How Whatt figures a cost

    Whatt multiplies typical use by a rate, then shows a simple dollar estimate for the habit you set. Defaults use common ranges so you can start quickly. Change size, hours, and habits anytime—your own bill rate is usually closer than an area average.

    Technical detail
    Power ≈ (watts ÷ 1000) × hours × (dollars per kWh) Water ≈ volume (or flow × time) × your water rate

    How to find your rate

    Electricity: On the bill, divide energy charges by kWh used for a simple average dollars-per-kWh—or open Find your rate and enter the totals Whatt asks for.

    Water: Bills often list usage in gallons (or another unit the utility prints). Use that with the dollar amount, or enter what Whatt requests. A bill-based rate is usually more realistic than a regional default.

    What these numbers include

    Estimates reflect the approximate cost of the energy or water for the use you configure.

    They typically do not include every line on a full utility bill—such as fixed monthly service fees, taxes, tiered or time-of-use pricing, demand charges, sewer minimums, or other provider-specific charges.

    That is why a Whatt estimate can differ from the total on a bill even when the usage idea is reasonable.

    Guide: How to read a power bill

    Most electric bills mix a few different ideas. You only need a few numbers to get a useful rate for Whatt.

    Usage (kWh). How much energy the home used. Look for “kWh” or “energy used.”

    Energy charges. The dollar amount tied to that usage—not always the whole bill if there are separate fees.

    A simple rate. Divide energy charges by kWh. Example: 90 ÷ 500 kWh ≈ 0.18 dollars per kWh (18¢).

    Other lines. Customer charges and taxes often do not change when you run a fan an extra hour. Whatt focuses on usage cost.

    Guide: Habits that quietly add up

    Hours beat myths. Leaving a fan on all day is hours × watts. For modern LEDs, how long the light stays on matters more than flipping the switch.

    Heat and cool dominate. Heating, AC, and electric water heat often dwarf a phone charger.

    Always-on loads. Routers and game consoles in standby draw a little all day.

    Water habits. Longer showers, extra rinses, and a running toilet add volume you can estimate.

    Guide: Finding a water leak

    Use Leak / drip on Water to price what a continuous leak costs. Pick the closest type (faucet, toilet, outdoor, irrigation, etc.).

    Meter test. Turn off all water. If the meter still moves, something is leaking.

    Toilet dye test. Color in the tank; wait without flushing. Color in the bowl = silent flapper leak (very common and expensive).

    Look and listen. Under sinks, water heater base, outdoor spigots, hissing valves, wet spots in the yard when irrigation is off.

    What to do. Shutoff under the fixture for a drip; replace a toilet flapper for silent tank leaks; call a plumber for slab, main line, or water heater issues. Main house shutoff is usually near the meter.

    FAQ

    Is Whatt my real bill?
    No. It estimates usage cost for the habits you set.

    Why doesn’t the number match my statement?
    Fees, rate structure, weather, or habits not in the estimate yet.

    Are the default watts and flow rates exact?
    Typical starting points. Labels and Fine-tune are better when you have them.

    Does Whatt need an account?
    No. My Home and rates stay on this device.

    Who is behind Whatt?
    See About for the story. Questions: support@whatt.net.

    How do I estimate a leak?
    Water → Leak / drip. Pick the closest type (or how bad it looks). It runs 24/7 in the estimate. What if shows a week or month of ignoring it vs fixing it. This is volume cost only — not a repair quote.

    Missing an appliance?
    Suggest an appliance (or water use) and we may add it in a future update.

    How the water is heated

    Look at the heater, not the shower head. It is usually in a closet, garage, basement, or laundry room. Match what you see, then use the button under that heading. The estimate defaults to electric tank.

    Electric tank

    Tall metal tank. Thick electric wires go to a box on the side. No gas pipe. Quiet hum when it runs. Common in apartments and homes with no gas.

    Gas tank

    Same tall tank, but a metal gas pipe is attached. Pipe is often black or yellow. You may hear a short whoosh when it fires. Exhaust goes outside.

    Propane tank

    Looks like a gas tank, but the fuel is propane from a tank in the yard or a cage by the house — not a city gas meter.

    Oil tank

    Tall tank like gas, common in the Northeast. Fuel oil from a tank in the basement or yard. Heavier fuel smell when it runs. Not a gas meter.

    Heat pump

    Tank with a round fan or grill on top, like a small air conditioner. Often says hybrid. Noisier. The room around it can feel cooler.

    Electric tankless

    No tall tank. A small box on the wall, near the shower or under a sink. Thick electric wires. Water heats as it flows. Use this if this shower has its own heater, not the whole-house tank.

    Gas tankless

    Small wall box, no tall tank. A gas pipe goes to it, and exhaust goes outside. Heats water as it flows. Also use this if this shower has its own small gas heater, not the whole-house tank.

    House boiler heats the water

    There is no separate tall water-heater tank. The same boiler that heats the house (radiators or baseboard) also heats the tap water, often through a tank or coil next to the boiler.

    No heat

    The water never gets hot. Outdoor shower, rain water, hose, some wells, cold-only taps. If this shower is hot, this is not you.

    If you skip this page, leave Electric tank. That is the default so the estimate is not too low. Solar panels on the roof usually still have an electric or gas backup — pick that backup.

    Contact