Energy & Environment Calculators

80 calculators and 5 tools.

Electricity Cost CalculatorFind electricity cost from kWh and rate.Energy Electricity Cost TrackerTrack electricity cost from usage and rate.Solar Savings CalculatorFind solar savings from monthly bill and percent.Solar Panel CalculatorFind solar panels needed from daily kWh and per panel.Solar Hours CalculatorFind solar hours from panels and hours each.Solar Panel Output CalculatorFind solar panel output from panels and watts each.Energy Solar CalculatorFind energy solar output from hours and watts.Energy Solar Calculator 14Find energy solar panels from roofs and panels each.Energy Desert Solar CalculatorFind energy desert solar panels from fields and panels each.Gas Cost CalculatorFind gas cost from litres and price.Water Cost CalculatorFind water cost from litres and rate.Carbon CalculatorFind carbon from electricity and factor.LED Savings CalculatorFind LED savings from old and new watts.Appliance Cost CalculatorFind appliance cost from watts and hours.Battery Capacity CalculatorFind battery capacity from voltage and amp hours.Heating Cost CalculatorFind heating cost from hours and rate.Cooling Cost CalculatorFind cooling cost from hours and rate.Energy Per Day CalculatorFind energy per day from monthly kWh.Fuel Efficiency CalculatorFind fuel efficiency from distance and litres.CO2 Savings CalculatorFind CO2 savings from trees and kg each.

Frequently asked questions

What are Energy & Environment calculators?

Energy & Environment calculators on BuildCalc are free tools that give instant results from the numbers you enter.

Are Energy & Environment calculators free?

Yes, all Energy & Environment calculators are free, with no sign-up and no download.

How do I use a Energy & Environment calculator?

Open a calculator from the list, enter your numbers, and read the instant result.

Water Savings CalculatorFind water savings from old and new litres.Recycle CalculatorFind recycled amount from total and percent.Waste CalculatorFind waste from total and recycled.Wind Energy CalculatorFind wind energy from turbines and kWh each.Green Energy CalculatorFind green energy percent from green and total.Electricity Bill CalculatorFind electricity bill from units and rate.Water Bill CalculatorFind water bill from units and rate.Gas Bill CalculatorFind gas bill from units and rate.Battery Storage CalculatorFind battery storage from batteries and kWh each.Energy Saving CalculatorFind energy saving from old and new kWh.Fuel Saving CalculatorFind fuel saving from old and new litres.Tree Planting CalculatorFind trees needed from area and trees per acre.Recycling Rate CalculatorFind recycling rate percent.Pollution CalculatorFind pollution from vehicles and kg each.Energy Wind CalculatorFind energy wind output from turbines and kWh each.Energy Hydro CalculatorFind energy hydro output from dams and MW each.Energy Nuclear CalculatorFind energy nuclear output from reactors and MW each.Energy Coal CalculatorFind energy coal cost from tonnes and price each.Energy Gas Calculator 2Find energy gas volume from cylinders and litres each.Energy Oil CalculatorFind energy oil cost from barrels and price each.Energy Battery Calculator 2Find energy battery life from cycles and hours each.Energy Recycle Calculator 2Find energy recycle amount from waste and percent.Energy Carbon Calculator 2Find energy carbon from cars and kg each.Final Energy CalculatorFind final energy total from days and kWh per day.Extra Energy CalculatorFind extra energy savings from months and savings per month.Energy Water CalculatorFind energy water usage from days and litres per day.Energy Tree CalculatorFind energy tree planting from areas and trees each.Energy Wind Calculator 14Find energy wind turbines from farms and turbines each.Energy Electric CalculatorFind energy electric bill from months and monthly bill.Energy Gas CalculatorFind energy gas usage from months and usage per month.Energy Recycle CalculatorFind energy recycle kg from weeks and kg per week.Energy Carbon CalculatorFind energy carbon kg from trips and kg each.Energy Battery CalculatorFind energy battery total from batteries and capacity each.Energy Pollution CalculatorFind energy pollution kg from days and kg per day.Energy Forest CalculatorFind energy forest trees from hectares and trees each.Energy River CalculatorFind energy river flow from hours and flow per hour.Energy Hydro CalculatorFind energy hydro power from turbines and kW each.Energy Geothermal CalculatorFind energy geothermal heat from wells and heat each.Energy Biomass CalculatorFind energy biomass kg from plants and kg each.Energy Nuclear CalculatorFind energy nuclear power from reactors and MW each.Energy Ocean CalculatorFind energy ocean wave power from waves and kW each.Energy Rainwater CalculatorFind energy rainwater litres from roofs and litres each.

Other tools

Energy Compost CalculatorFind energy compost kg from bins and kg each.Energy Saving ListBuild an energy saving list.Energy Recycle ChecklistChecklist for recycling at home.Energy Bill CounterCount energy saving days.
Energy Source PickerPick an energy source.Ceiling Fan Cost CalculatorFree ceiling fan cost calculator estimate. Enter watts, hours and your electricity rate. Prices are editable estimates, your actual use and rate may differ.Central AC Running Cost CalculatorCentral AC Running Cost Calculator: Free Monthly Estimate (2026) - free online calculator. AC power varies with size and outside temperature. Use the.Dehumidifier Cost CalculatorFree dehumidifier cost calculator estimate. Enter watts, hours and your electricity rate. Prices are editable estimates, your actual use and rate may differ.Dishwasher Cost CalculatorFree dishwasher cost calculator estimate. Enter watts, hours and your electricity rate. Prices are editable estimates, your actual use and rate may differ.Electric Dryer Cost CalculatorFree electric dryer cost calculator estimate. Enter watts, hours and your electricity rate. Prices are editable estimates, your actual use and rate may differ.Electric Oven Cost CalculatorFree electric oven cost calculator estimate. Enter watts, hours and your electricity rate. Prices are editable estimates, your actual use and rate may differ.Electric vs Gas Water Heater Cost CalculatorElectric vs Gas Water Heater Cost Calculator: Free Comparison (2026) - free online calculator. This compares running cost only, not purchase or.Electric Water Heater Cost CalculatorFree electric water heater cost calculator estimate. Enter watts, hours and your electricity rate. Prices are editable estimates, your actual use and rate may differ.EV Charging Cost CalculatorEV Charging Cost Calculator: Free Monthly Charging Estimate (2026) - free online calculator. Use your car's actual kWh per 100 miles from its.EV vs Gas Car 5-Year Cost CalculatorEV vs Gas Car 5-Year Cost Calculator: Free Comparison (2026) - free online calculator. This compares running cost only. Purchase price, maintenance,.Heat Pump vs Furnace CalculatorFree heat pump vs furnace calculator. Compare annual heating cost from your heating demand, electricity price, gas price, heat pump COP and furnace efficiency. Prices are editable estimates.Home Electric Bill EstimatorHome Electric Bill Estimator: Free Monthly Bill Estimate (2026) - free online calculator. Add taxes and delivery charges from your bill if your utility.Hot Tub Cost CalculatorFree hot tub cost calculator estimate. Enter watts, hours and your electricity rate. Prices are editable estimates, your actual use and rate may differ.Pool Pump Cost CalculatorFree pool pump cost calculator estimate. Enter watts, hours and your electricity rate. Prices are editable estimates, your actual use and rate may differ.Refrigerator Cost CalculatorFree refrigerator cost calculator estimate. Enter watts, hours and your electricity rate. Prices are editable estimates, your actual use and rate may differ.Solar Payback CalculatorSolar Payback Calculator: Free Payback Estimate (2026) - free online calculator. Production per kW depends on your roof, direction, shading and local.Space Heater Cost CalculatorFree space heater cost calculator estimate. Enter watts, hours and your electricity rate. Prices are editable estimates, your actual use and rate may differ.Window AC Cost CalculatorFree window ac cost calculator estimate. Enter watts, hours and your electricity rate. Prices are editable estimates, your actual use and rate may differ.
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Free to use

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Formula shown on the page

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Works on mobile

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Topic hubs

Topic index pages. These hub pages are not counted in the tool totals above.

Electricity Rates by StateAverage residential electricity rate for all 50 states and DC, from EIA 2024 data, with average monthly use and bill. Pick your state to fill the calculator.