Sustainability Calculators & Tools
Practical calculators for energy, solar, transport, carbon, water and sustainability.
Energy Calculators
Electricity consumption, appliance use and energy cost tools.
Waste Heat Recovery Calculator
Estimate recoverable sensible heat, annual energy recovery and cost savings from a hot gas or liquid stream.
Compressed Air Pressure Reduction Savings Calculator
Estimate energy and electricity cost savings from reducing compressed-air system pressure.
Air Compressor Efficiency Calculator
Calculate compressor specific power, specific energy, annual electricity use and operating cost from input power and delivered airflow.
Lighting Energy Savings Calculator
Calculate annual energy and electricity cost savings from replacing existing lighting with lower-wattage fixtures.
Transformer Efficiency Calculator
Calculate transformer efficiency, copper loss, total loss and annual energy loss from transformer rating, load and loss data.
Motor Energy Savings Calculator
Compare existing and higher-efficiency motors to estimate annual energy and electricity cost savings.
Motor Load Calculator
Calculate motor load percentage and unused capacity from rated motor power and actual mechanical output.
Motor Efficiency Calculator
Calculate motor input power, energy losses and annual cost of losses from output power, efficiency and operating hours.
VFD Energy Savings Calculator
Estimate energy and cost savings from reducing centrifugal pump or fan speed with a variable frequency drive.
Boiler Fuel Consumption Calculator
Calculate boiler fuel consumption from steam production, steam enthalpy, feedwater temperature, boiler efficiency and fuel heating value.
Steam Velocity Calculator
Calculate steam velocity from saturated-steam flow rate, pressure and pipe internal diameter.
Steam Pressure Drop Calculator
Estimate steam-line pressure drop, outlet pressure, velocity and friction factor from flow rate, pressure, pipe diameter and length.
Steam Pipe Sizing Calculator
Calculate required steam pipe internal diameter from saturated-steam flow, pressure and target velocity.
Steam Flash Loss Calculator
Calculate flash steam percentage and flow when hot condensate is reduced from a higher pressure to a lower…
Steam Trap Loss Calculator
Calculate annual steam loss, energy loss and cost from a leaking or failed-open steam trap.
Boiler Blowdown Heat Recovery Calculator
Estimate recoverable heat, avoided fuel energy and annual cost savings from boiler blowdown heat recovery.
Steam Condensate Recovery Savings Calculator
Estimate energy and cost savings from returning hot condensate instead of replacing it with colder makeup water.
Pipe Insulation Heat Loss Calculator
Calculate heat loss through insulated piping from pipe diameter, insulation thickness, thermal conductivity and temperature difference.
Heat Exchanger Area Calculator
Calculate required heat-transfer area from heat duty, overall heat-transfer coefficient, LMTD and correction factor.
Heat Exchanger LMTD Calculator
Calculate log mean temperature difference for counterflow and parallel-flow heat exchangers.
Heat Exchanger Duty Calculator
Calculate heat-transfer duty from fluid flow rate, specific heat capacity and inlet and outlet temperatures.
Cooling Load Calculator
Estimate preliminary sensible cooling load from envelope heat gain, occupancy, lighting, equipment and outdoor air.
Cooling Tower Efficiency Calculator
Calculate cooling tower effectiveness, range, approach and heat rejection from water and wet-bulb temperatures.
Chiller Efficiency Calculator
Calculate chiller COP, kW per refrigeration ton and EER from cooling capacity and electrical input power.
Compressed Air Leak Cost Calculator
Calculate power waste, energy loss and annual electricity cost caused by compressed-air leaks.
Compressed Air Cost Calculator
Calculate compressed air energy cost, specific power and cost per 1,000 m³ from compressor power, air delivery and…
Steam Cost Calculator
Calculate fuel consumption and energy cost per tonne of steam from steam enthalpy, feedwater temperature and boiler efficiency.
Boiler Efficiency Calculator
Calculate boiler efficiency from measured fuel input and useful steam or hot-water heat output.
Energy Cost per Production Unit Calculator
Calculate energy intensity and energy cost per unit of production from electricity use, production output and tariff.
Voltage Drop Calculator
Calculate cable voltage drop, receiving voltage and conductor power loss for DC, single-phase and three-phase circuits.
Motor Current Calculator
Calculate estimated full-load motor current from motor power, voltage, power factor and efficiency.
Generator Size Calculator
Estimate generator capacity from total running load, power factor and the starting demand of the largest load.
Transformer Load Calculator
Calculate transformer loading, actual kVA demand, remaining capacity and full-load current.
Power Factor Correction Calculator
Calculate the capacitor bank kVAr required to improve electrical power factor from an existing value to a target…
Three-Phase Power Calculator
Calculate real power, apparent power and reactive power from voltage, current and power factor.
Home Energy Consumption Calculator
Estimate your household electricity consumption and cost by adding the appliances you use at home.
Battery Runtime Calculator
Estimate how long a battery or inverter system can power a load using battery capacity, voltage, usable depth…
Appliance Electricity Cost Calculator
Calculate how much electricity any household appliance uses and how much it costs to run.
Electricity Bill Calculator
Calculate your estimated monthly and annual electricity cost.
AC Electricity Cost Calculator
Estimate your air conditioner's daily, monthly and annual electricity consumption and running cost.
Solar Calculators
Solar sizing, generation, savings and rooftop tools.
Solar Cable Voltage Drop Calculator
Calculate DC cable voltage drop, percentage loss and power loss for a solar or battery circuit.
Solar Water Pump Size Calculator
Calculate pump power, solar panel capacity and required flow rate from daily water demand and pumping head.
PV Array Grounding Conductor Size Calculator (NEC)
Find the minimum PV equipment grounding conductor size from the circuit overcurrent protection rating.
Solar Generator Size Calculator
Calculate the battery, inverter and solar panel capacity required for a portable solar generator or backup power system.
Off-Grid Solar System Size Calculator
Estimate the solar array, battery storage and inverter size needed for an off-grid solar system.
Solar Panel Cleaning Savings Calculator
See how much energy and money you could recover by cleaning dirty solar panels.
Solar Panel Degradation Calculator
Estimate how much solar panel capacity remains after years of annual degradation.
Solar Panel Temperature Loss Calculator
Estimate solar panel power loss and adjusted output at elevated or reduced cell temperature.
Solar Panel Efficiency Calculator
Calculate solar panel efficiency from rated power, panel dimensions and solar irradiance.
Solar Panel Area Calculator
Calculate the number of solar panels and approximate roof area required for a target solar system size.
Solar Panel Daily Energy Output Calculator
Estimate daily, monthly and annual solar energy generation from panel capacity, quantity, peak sun hours and system losses.
Solar Combiner Box Size Calculator
Estimate the required solar combiner box current rating from string current and the number of parallel PV strings.
Solar Array Voltage & Current Calculator
Calculate solar array voltage, current, total panels and approximate DC power from panel specifications and series-parallel configuration.
Solar Fuse Size Calculator
Estimate a suitable DC fuse rating for a solar PV string or battery-side DC circuit.
Solar Series & Parallel Configuration Calculator
Find a practical solar panel series and parallel configuration from plant size, panel voltage and inverter limits.
Solar String Size Calculator
Calculate the minimum and maximum number of solar panels that can be connected in series per inverter string.
Solar DC Cable Size Calculator
Estimate the DC cable size required for a low-voltage solar or battery circuit using plant capacity, system voltage,…
Solar Panel Tilt Angle Calculator
Estimate a practical solar panel tilt angle from your latitude for year-round, summer or winter solar production.
Solar Charge Controller Size Calculator
Calculate the minimum solar charge controller current and a suitable standard controller size for your solar array.
Solar Inverter Size Calculator
Estimate the inverter size required for your electrical load, including allowance for motor or compressor starting surge.
Solar Battery Size Calculator
Calculate the battery capacity required to run your selected backup load for a chosen number of hours.
Solar Payback Calculator
Estimate solar payback period, lifetime savings and investment returns using your actual energy and financial assumptions.
Solar Panel Requirement Calculator
Estimate the solar system size and number of panels needed to meet your electricity consumption.
Solar Savings Calculator
Estimate the rooftop solar capacity, savings and roof area needed for your electricity use.
EV & Mobility Calculators
Electric vehicle charging and running cost tools.
EV Charging Time Calculator
Estimate how long an electric vehicle will take to charge based on battery size, state of charge, charger…
EV Charging Cost Calculator
Calculate how much electricity and money it takes to charge your electric vehicle.
EV vs Petrol Cost Calculator
Compare the running cost of an electric vehicle with a petrol vehicle and estimate your monthly and annual…
Transport Calculators
Fuel, travel and vehicle running cost tools.
Vehicle CO₂ Emissions Calculator
Calculate operational CO₂ emissions from petrol, diesel, hybrid and electric vehicles using distance, fuel economy or electricity consumption.
Fuel Cost Calculator
Calculate fuel required, trip cost and cost per kilometre based on distance, mileage and fuel price.
Carbon Calculators
Carbon footprint and greenhouse gas emission tools.
Waste Disposal Emissions Calculator
Calculate emissions from multiple waste types and treatment methods in one report.
Employee Commuting Emissions Calculator
Calculate annual employee commuting emissions from commute distance, working days, employees and an editable passenger-kilometre emission factor.
Business Travel Emissions Calculator
Calculate business travel emissions from distance, travelers, trips and an editable passenger-kilometre emission factor.
Freight Emissions Calculator
Calculate freight transport emissions from cargo weight, distance and an editable tonne-kilometre emission factor.
Carbon Payback Calculator
Calculate how long a project takes to offset its upfront embodied carbon through annual emissions savings.
Carbon Reduction Target Calculator
Calculate target emissions, required reductions and annual decarbonization rates from a baseline and reduction target.
Carbon Intensity Calculator
Calculate greenhouse gas emissions per unit of production, activity, area, distance or other output.
Fuel Carbon Emissions Calculator
Calculate fuel-related greenhouse gas emissions from fuel consumption and an editable emission factor.
Scope 1 & Scope 2 Emissions Calculator
Estimate direct Scope 1 and purchased-electricity Scope 2 greenhouse gas emissions using editable emission factors.
Avoided Emissions Calculator
Compare baseline and project energy scenarios to calculate avoided greenhouse gas emissions and percentage reduction.
Electricity Carbon Emissions Calculator
Calculate electricity-related carbon emissions using recent country electricity carbon intensity or a custom emission factor.
Refrigerant Emissions Calculator
Calculate refrigerant greenhouse gas emissions in CO₂e from refrigerant charge, leakage or release and global warming potential.
Carbon Footprint Calculator
Estimate your carbon footprint from household energy, fuel use and air travel.
Water Calculators
Water use, conservation and harvesting tools.
AI Data Center Water Footprint Calculator
Estimate data center cooling water use thermodynamically from AI power load, PUE, evaporative cooling and cooling-tower operation.
AI Water Footprint Calculator – Estimate AI Water Usage
Estimate the operational water footprint of your AI use from active usage time and AI activity.
Stormwater Runoff Calculator
Calculate peak stormwater runoff from catchment area, rainfall intensity and runoff coefficient using the Rational Method.
Water Hammer Pressure Calculator
Estimate water hammer pressure surge from a rapid change in flow velocity using the Joukowsky equation.
Pump Efficiency Calculator
Calculate pump efficiency from flow rate, total dynamic head and measured shaft or electrical input power.
Pipe Fittings Head Loss Calculator
Calculate minor head loss and pressure loss through pipe fittings, valves, entrances and exits.
Darcy-Weisbach Head Loss Calculator
Calculate pipe friction head loss, pressure loss and Darcy friction factor from flow rate, pipe size and roughness.
NPSH Available Calculator
Calculate pump NPSH available from site altitude, suction level, friction loss and water temperature.
Reynolds Number Calculator
Calculate Reynolds number and identify laminar, transitional or turbulent flow in a circular pipe.
Manning’s Open Channel Flow Calculator
Calculate open-channel flow rate and velocity for rectangular and trapezoidal channels using Manning's equation.
Weir Flow Calculator
Calculate water flow over rectangular and V-notch sharp-crested weirs.
Orifice Flow Calculator
Calculate water flow through a circular orifice from opening diameter, water head and discharge coefficient.
Pipe Size Calculator
Calculate the required internal pipe diameter from flow rate and target water velocity.
Water Tank Fill Time Calculator
Calculate how long it will take to fill a water tank from tank capacity and inlet flow rate.
Tank Volume Calculator
Calculate tank capacity in litres, cubic metres, US gallons and Imperial gallons.
Water Pressure Calculator
Calculate water pressure from vertical water head or elevation difference.
Total Dynamic Head Calculator
Calculate pump total dynamic head from static head, discharge pressure, pipe friction and minor losses.
Pipe Friction Loss Calculator
Calculate water pipe head loss and pressure loss using the Hazen–Williams equation.
Pipe Velocity Calculator
Calculate water velocity in a full circular pipe from flow rate and internal pipe diameter.
Pipe Flow Rate Calculator
Calculate water flow rate from pipe diameter and average flow velocity.
Pump Power Calculator
Calculate hydraulic power, pump shaft power and motor input power from flow rate, total head and efficiency.
Household Water Use Calculator
Estimate daily, monthly and annual household water use from showers, toilets, laundry, taps and outdoor activities.
Rainwater Harvesting Calculator
Estimate how much rainwater can be collected from a roof or other catchment surface.
Waste Calculators
Waste generation, recycling and resource tools.
Construction Waste Calculator
Estimate construction waste generation and disposal quantities.
Food Waste Cost Calculator
Estimate the financial cost of food waste from wasted food value, disposal costs and recoverable value.
Waste Compactor Savings Calculator
Estimate hauling savings from reduced waste pickup frequency after compaction.
Landfill Volume Calculator
Estimate waste volume and landfill space requirement from waste mass, bulk density and compaction.
Waste-to-Energy Calculator
Estimate thermal input and electricity generation from a waste-to-energy system using waste feed rate, heating value and conversion…
Waste Diversion Rate Calculator
Calculate the percentage of waste diverted from disposal through recycling, composting, reuse and other recovery routes.