Household costs

Turn energy use into a clear daily, monthly or annual cost.

Model appliances, household tariffs, EV charging, heating choices and solar payback using explicit kW/kWh assumptions.

Quick start

What are you trying to decide?

Convert watts and usage time into kWh and money.

Use the same canonical charging engine as Car Affordability.

Hold usage constant and isolate the rate impact.

Featured tools

Watts → kWh → annual cost.

Annual kWh + standing charges.

Shared canonical engine with the car section.

Compare useful heat using explicit efficiency assumptions.

Simple payback from self-use and export assumptions.

Old versus new tariff at constant usage.

How to read the result

Keep kW (power) and kWh (energy) distinct. Tariffs change, so use your own bill or a source-dated benchmark rather than a silent average.

Accuracy boundary

Daily/monthly/yearly conversions are deterministic; tariff and efficiency values remain explicit assumptions.

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