Australian homelab power-cost calculator

Compare the yearly electricity usage of two or three devices. All maths runs in your browser. The calculator doesn't send what you enter anywhere.

Yearly energy is kWh/yr = watts × hours/day × 365 ÷ 1000. Yearly cost is kWh × c/kWh ÷ 100, in Australian dollars. That is usage only: it does not include a daily supply charge, controlled-load rates, or time-of-use periods.

Average watts drive the yearly cost. Idle watts are run through the same formula for the same hours and shown as a floor — what the year would cost if the device sat at idle the whole time. Idle is not added on top of average. Hours per day are how long the device is powered (use 24 for a home server that never switches off).

Presets are official residential flat usage rates, GST inclusive, for the named network or tariff. They are not your retailer’s market offer, and they are not a state-wide average. You can override the rate. Sources and dates are in SOURCES.md and next to the preset you pick. The Australian Capital Territory has no preset. The AER's Default Market Offer doesn't apply there (it covers NSW, South East Queensland and SA), and the ACT regulator (ICRC) set a maximum average price change for ActewAGL's standing offers rather than a single c/kWh rate. Use the usage rate on your bill.

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