WATTS × TIME, MADE VISIBLE

Put a number on running it.

Estimate an appliance’s electricity use and usage charge from your power, schedule and tariff. See active and remaining-time energy separately.

Your tariff, no price guessesLocal CSV & text reports

Describe one device or identical set

Defaults are an invented arithmetic example, including the tariff. Replace them with your own information.

Power in two states

Active input power, each device

Electrical input, not heating/cooling output.

Active power unit

Changing unit converts the same power.

Remaining-time power, each · W

For every hour outside the active state. Enter 0 if fully off.

Identical devices

Same power and schedule for each.

A repeating seven-day schedule

Scheduled hours per used day

Used days per week

Active share of scheduled time · %

100% means all scheduled time. A lower value is your assumption.

Estimate length · days

Prorated weekly average, not a calendar count.

Your electricity usage rate

Rate per kWh

Use your applicable rate, with your chosen tax basis.

Rate unit

100 cents or pence = 1 currency unit.

Currency label

Changes the label only; no exchange conversion.

Average usage charge

Check the inputs.

No usable estimate is shown until all fields are valid.

Energy and charges cover all entered devices; hours are per device.
State	Hours/week	Energy/week
Active
Remaining

Remaining-time power applies throughout the rest of the week, including non-use days and the inactive part of scheduled time.

Show computed precision

Charges shown to two decimals. Exports retain computed numbers. This is a usage-charge estimate, not a bill.

Selectable energy estimate report

01 · INPUT

Watts describe a rate of use. A rating, a measured average and a heating output are different things. Choose values that fit this model.

02 · SCHEDULE

The active share sets active hours. Every other hour uses the remaining-time power you enter, including unused days.

03 · INTERPRET

The tool has one usage tariff. Fixed charges, demand charges and time-of-use periods need other information. Read the worked method.