32 FREE TOOLS · ◎
Energy & environment calculators
Explore consumption and emissions with transparent assumptions.
Electricity use & bills
Translate power, time and entered tariffs into energy charges.
Explore topic ↗9 calculatorsSolar generation & value
Compare solar production, on-site use, exports and simple financial value.
Explore topic ↗6 calculatorsWater use & conservation
Estimate water use, rain collection, bills and measured leaks.
Explore topic ↗2 calculatorsEmissions & resource use
Estimate emissions and diversion using explicit factors and definitions.
Explore topic ↗All energy & environment calculators
Appliance Energy Calculator
Estimate electricity consumption from appliance power and operating hours.
Electricity Cost Calculator
Calculate energy charges from consumption and a manually entered unit rate.
Solar Output Calculator
Estimate solar energy from rated capacity, equivalent full-sun hours and a system factor.
Water Use Calculator
Estimate water use for repeated timed activities such as showers.
Rainwater Collection Calculator
Estimate collected water from rainfall, roof area and a runoff factor.
Carbon Emissions Calculator
Estimate emissions from activity multiplied by a chosen emission factor.
LED Savings Calculator
Estimate energy savings from replacing equal-use lighting with lower-wattage bulbs.
Energy Payback Calculator
Estimate simple payback time for an efficiency upgrade.
Heating Energy Calculator
Estimate ideal energy required to raise water temperature.
Waste Diversion Calculator
Calculate the share of waste sent to recycling or reuse instead of disposal.
Electricity Bill Calculator
Combine metered energy charges and a fixed daily charge.
Appliance Annual Cost Calculator
Estimate annual electricity spending for a constant-power appliance.
Standby Power Cost Calculator
Estimate annual electricity cost for a load left continuously in standby.
Solar Self Consumption Calculator
Find the share of generated solar electricity used directly on site.
Solar Self Sufficiency Calculator
Find the share of total site demand met by on-site solar energy.
Solar Export Revenue Calculator
Estimate revenue from exported electricity at a manually entered flat rate.
Solar Annual Value Calculator
Combine avoided import spending and export income for a solar scenario.
Water Bill Calculator
Estimate water charges from a volume-based rate and a fixed period charge.
Shower Water Saving Calculator
Compare water use before and after reducing flow rate for repeated showers.
Leak Water Loss Calculator
Estimate water lost through a continuous measured leak.
Area Normalised Insulation R Value Calculator
Find thermal resistance per unit area from insulation thickness and conductivity.
U Value From R Value Calculator
Convert an entered total thermal resistance into a heat-transmittance coefficient.
Heat Loss From U Value Calculator
Estimate steady heat transfer through an envelope area using an overall U-value.
Heating Fuel Input Calculator
Estimate input fuel energy for a useful-heating demand.
Heat Pump Electricity Calculator
Estimate heat-pump electricity from delivered heat and an assumed COP.
Water Heating Cost Calculator
Estimate energy spending for a water-temperature increase under a stated efficiency.
Building Energy Intensity Calculator
Normalise entered building energy use by floor area.
Solar Panel Count Calculator
Convert a nominal solar-array power target into whole panel count.
Solar String Open Circuit Voltage Calculator
Add chosen design open-circuit voltages for a series solar string.
Solar Parallel Short Circuit Current Calculator
Sum short-circuit current assumptions for equal parallel solar strings.
Solar Battery Charging Hours Calculator
Estimate equivalent constant-power solar hours to replace a battery-energy amount.
Stored Water Supply Days Calculator
Estimate how long usable stored water lasts at a fixed daily withdrawal.
Make your inputs count
Enter factors that match your location, equipment and reporting period. Example factors and efficiencies are illustrative assumptions rather than official local data. A simple estimate does not model every change in weather, behaviour or equipment performance.