WattMeasureMy energy plan

HOME ENERGY, MADE LEGIBLE

See where your energy money goes.

Clear calculators for appliances, cooling, EV charging, heating, backup power, and electricity rates—using your numbers and math you can inspect.

Calculate a cost →Build an energy plan
Inputs stay on your deviceNo accountSources shown
KitchenLivingGarageUtility
THIS MONTH$148.20
Planning estimate · 824 kWh
1 kWh

is 1,000 watts used for one hour

× your rate

turns energy into operating cost

12 LAUNCH CALCULATORS

Start with the question on your bill.

Every tool includes editable assumptions, a worked example, limitations, and authoritative sources.

01Everyday electricity

Any appliance

Turn appliance wattage and use time into daily, monthly, and annual electricity costs.

Open calculator →02Heating & cooling

Air conditioner

Estimate central or room AC costs from input watts, runtime, and local electricity price.

Open calculator →03Heating & cooling

Space heater

See what a portable electric heater may add to your bill by room, schedule, or season.

Open calculator →04Laundry & kitchen

Clothes dryer

Estimate electricity cost per drying cycle and across a month or year.

Open calculator →05Laundry & kitchen

Refrigerator

Estimate annual refrigerator energy cost using average running watts and compressor runtime.

Open calculator →06Vehicles

EV charging

Convert monthly driving and vehicle efficiency into wall energy, charging cost, and cost per mile.

Open calculator →07Water heating

Water heater

Estimate electric water-heating cost from element power and daily heating time.

Open calculator →08Heating & cooling

Heat pump vs gas

Compare delivered-heat costs using heat-pump COP, furnace efficiency, and local energy prices.

Open calculator →09Backup power

Generator fuel

Estimate gasoline or propane volume and cost for a planned outage runtime.

Open calculator →10Backup power

Battery runtime

Estimate how long a battery can support a defined essential-load total.

Open calculator →11Lighting

LED savings

Compare existing bulb wattage with LED replacements across a room or whole home.

Open calculator →12Electricity rates

Peak vs off-peak

Compare a peak/off-peak schedule with a flat rate using your monthly energy mix.

Open calculator →

A VISIBLE METHOD

Your inputs.
The open math.

Defaults are clearly labeled. Rates and wattages are editable. Every result remains an estimate, with the variables that matter explained beside it.

Read the methodology →
  1. 01

    Use the label

    Start with a nameplate, manual, utility bill, or plug-meter reading.

  2. 02

    Describe real use

    Enter actual runtime, charging, season, or rate-window assumptions.

  3. 03

    Compare scenarios

    Change one assumption at a time and save useful results to your Home Energy Plan.

THE BILL IS A SYSTEM

Useful context, not false precision.

W

Power is not energy

Watts describe the rate of use. Kilowatt-hours combine that draw with time—the quantity your utility usually bills.

$

Your rate matters

National averages are context, not your local cost. Every electricity calculator lets you enter your own rate.

≈

Homes behave differently

Climate, cycling, efficiency, delivery fees, habits, and equipment condition can materially change the final bill.

Learn the energy basics →

HOUSE PROJECTS · NOT ADS

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