Appliance electricity cost
Uses constant power and the entered unit tariff.
Energy and household resources ↗THE SUMFIZZ LIBRARY
Energy and household resources calculators
Explore 25 free tools for energy and household resources. Find appliance electricity cost, electricity bill estimate, gas energy conversion and more. Each calculator explains its inputs and method, with examples you can try using your own numbers.
THE SUMFIZZ LIBRARY
What are we working out?
Electricity bill estimate
Meter readings must be cumulative in kWh.
Energy and household resources ↗Gas energy conversion
Use the conversion factors on your bill.
Energy and household resources ↗Heating fuel comparison
Fuel units and energy content must correspond.
Energy and household resources ↗Heat pump running cost
Seasonal performance varies with system design, weather and temperatures.
Energy and household resources ↗Solar generation scenario
A simplified irradiance-equivalent estimate; it is not a roof-specific solar forecast.
Energy and household resources ↗Solar self-consumption
Generation used on site offsets imports at the entered price.
Energy and household resources ↗Solar simple payback
Simple payback ignores discounting, degradation, financing and replacement costs.
Energy and household resources ↗Home battery economics
Capacity is delivered discharge energy.
Energy and household resources ↗Battery runtime
Constant-load energy estimate.
Energy and household resources ↗Battery recharge time
Assumes constant charging power; actual tapering and thermal limits can lengthen charging.
Energy and household resources ↗Energy unit converter
One watt-hour is 3,600 joules.
Energy and household resources ↗Heating degree days
Sum positive differences between the base and each daily mean.
Energy and household resources ↗Cooling degree days
Sum positive daily mean temperatures above the chosen base.
Energy and household resources ↗Water heating energy
Approximates water at 1 kg/L with specific heat 4.186 kJ/(kg·K); phase changes and ongoing losses are excluded.
Energy and household resources ↗Hot-water mixing
Ideal energy balance for water, neglecting heat loss and density change.
Energy and household resources ↗Shower water cost
Heat energy per litre is supplied by you and should include heater efficiency.
Energy and household resources ↗Leaking tap loss
Uses a measured volume rate, not a universal assumed drop size.
Energy and household resources ↗LED replacement savings
Compares electricity cost only, excluding lifetime differences and replacement labour.
Energy and household resources ↗Standby power cost
Assumes every device draws the stated standby power for the full interval.
Energy and household resources ↗Insulation heat-loss scenario
Steady-state conduction through one surface only.
Energy and household resources ↗Ventilation heat-loss estimate
No heat recovery or latent heat is included.
Energy and household resources ↗Carbon footprint from entered factors
Each activity must use the unit matching its factor.
Energy and household resources ↗Waste diversion rate
All quantities must use the same mass unit.
Energy and household resources ↗Water storage autonomy
Constant consumption and refill model; timing and minimum reserve are not included.
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