Calculators

Every calculator here runs entirely in your browser, needs no login or email, and shows the formula and assumptions behind the result. Grouped by energy, solar, renovation and trades.

Energy

Air Conditioner Running Cost Calculator

Estimate daily, monthly and annual air-con electricity costs from your own power rating, usage and tariff.

Electricity Usage Calculator

Add appliances (power × hours × tariff) for daily, monthly and annual electricity costs.

EV Charging Cost Calculator

Compare home, mixed and public EV charging costs from your consumption, distance and tariffs.

Pool Running Cost Calculator

Estimate pool pump (and optional heater) energy and cost from your equipment and schedule.

Solar

Solar Battery Payback Calculator

Model simple battery payback and 10-year savings from your installed cost, usable capacity, tariffs and solar surplus.

Solar System Size Calculator

Size a solar system from your daily use, target offset and your own peak-sun-hours — no invented irradiance defaults.

Federal Battery Discount Estimator

A rough, dated indicative estimate of the federal battery discount — not an official government calculator.

Renovation

Home Renovation Budget Calculator

Build a line-item renovation budget with contingency and low/base/high scenarios.

Trades

A quote comparison worksheet is built into the trade cost guides.

Plumber cost & quote comparison

Sourced plumber rates plus a worksheet to compare itemised quotes.

Electrician cost & quote comparison

Sourced electrician rates and a like-for-like quote comparison tool.