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Ecology & Green Energy Calculators

Carbon footprint, solar panel output, energy savings and environmental impact calculators.

100 calculatorsCarbon footprint, solar & renewable energy

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Carbon FootprintEstimate your annual household carbon footprint from electricity, vehicle, and natural gas use.Solar Output CalculatorEstimate the daily and monthly electricity output of a solar panel system based on its size and local sun hours.Food Water FootprintEstimate the water footprint of your diet based on how much of common food types you eat.Flight Carbon FootprintEstimate the CO2 emissions from a flight based on distance and cabin class.

All calculators

Solar Payback Period CalculatorCalculate how many years it takes for a solar panel system to pay for itself through electricity bill savings.
LED Light Bulb Savings CalculatorCalculate how much switching from incandescent to LED bulbs saves on your electricity bill.
EV vs Gas Car Cost CalculatorCompare the annual fuel cost of driving an electric vehicle versus a gas-powered car.
Rainwater Harvesting CalculatorCalculate how many gallons of rainwater you can collect from your roof based on rainfall and roof area.
Compost Ratio CalculatorCalculate how much "brown" material to add to your compost pile based on your "green" material and target ratio.
Tree Carbon Offset CalculatorCalculate how many trees would be needed to offset a given amount of annual CO2 emissions.
Wind Turbine Power Output CalculatorEstimate the power output of a wind turbine from its rotor diameter and wind speed.
Household Water Usage CalculatorEstimate your household's daily and annual water usage from showers, toilet flushes, and laundry loads.
Recycling Impact CalculatorEstimate the energy and CO2 emissions saved by recycling common materials instead of sending them to landfill.
Food Waste Cost CalculatorEstimate the dollar value of food your household throws away each year.
Home Insulation Savings CalculatorEstimate the heat loss reduction and energy savings from upgrading your home's insulation R-value.
E-Bike vs Car Commute Savings CalculatorCompare the annual cost and CO2 savings of commuting by e-bike instead of driving.
Home Battery Backup Runtime CalculatorCalculate how long a home battery storage system can power your essential loads during an outage.
Xeriscaping Water Savings CalculatorEstimate the water saved by converting a traditional grass lawn to drought-tolerant (xeriscape) landscaping.
Carbon Offset Cost CalculatorCalculate the cost to purchase carbon offsets for a given amount of CO2 emissions at current market pricing.
Methane to CO2 Equivalent CalculatorConvert a quantity of methane emissions into its CO2-equivalent using the IPCC global warming potential factor.
EV Charging Cost & Time CalculatorCalculate how long it takes to charge your EV and how much a full charge costs.
Diet Carbon Footprint CalculatorCompare the carbon footprint of different diet patterns based on published food-emissions data.
Green Roof Stormwater Retention CalculatorEstimate how much stormwater runoff a green (vegetated) roof retains compared to a conventional roof.
Passive Solar Heat Gain CalculatorEstimate the solar heat gain through a window based on its area and Solar Heat Gain Coefficient (SHGC).
Heat Pump Savings CalculatorEstimate energy savings from switching to a heat pump versus electric resistance heating, based on Coefficient of Performance (COP).
Tankless vs Tank Water Heater Savings CalculatorCompare the annual energy cost of a tankless versus storage tank water heater.
Online Shopping vs In-Store Carbon Footprint CalculatorCompare the estimated carbon footprint of an online delivery versus a personal car trip to the store.
Vermicomposting (Worm Bin) Size CalculatorCalculate the worm bin size and worm population needed for your household's food scrap output.
Dishwasher vs Hand Washing Water CalculatorCompare the water usage of running a dishwasher versus hand washing the same load of dishes.
Clothesline vs Dryer Savings CalculatorCalculate the energy and cost savings from air-drying laundry instead of using an electric dryer.
Geothermal vs Air-Source Heat Pump CalculatorCompare the annual operating cost of a geothermal (ground-source) heat pump versus an air-source heat pump.
Residential Wind Turbine Payback Period CalculatorCalculate how many years it takes for a small wind turbine to pay for itself through electricity savings.
Streaming & Data Usage Carbon Footprint CalculatorEstimate the CO2 emissions from streaming video and data usage.
Air Changes Per Hour (ACH) CalculatorCalculate the ventilation rate (air changes per hour) for a room given its airflow and volume.
Waste Diversion Rate CalculatorCalculate the percentage of waste diverted from landfill through recycling and composting.
Electric vs Gas Lawn Mower CalculatorCompare the annual operating cost and emissions of an electric versus gas-powered lawn mower.
Home Battery Storage Payback Period CalculatorCalculate the payback period for a home battery storage system based on time-of-use bill savings.
Programmable Thermostat Savings CalculatorEstimate annual heating and cooling savings from using a programmable or smart thermostat with setbacks.
Reusable Water Bottle Savings CalculatorCalculate the money saved and plastic bottles avoided by switching to a reusable water bottle.
Home Air Sealing Savings CalculatorEstimate energy savings from reducing air leakage (infiltration) in your home.
Ethanol Blend Fuel Economy CalculatorCalculate the effective fuel economy and cost impact of using an ethanol-blended fuel like E85.
Carpooling Emissions Savings CalculatorCalculate the CO2 emissions and cost saved per person by carpooling instead of driving separately.
Food Miles Carbon Footprint CalculatorEstimate the transportation carbon footprint of food based on distance traveled and shipping method.
Greywater Reuse Savings CalculatorEstimate the fresh water saved by reusing household greywater (shower, sink, laundry) for irrigation.
EV Manufacturing Carbon Payback CalculatorEstimate how many miles of driving it takes for an EV's cleaner operation to offset its higher manufacturing carbon footprint.
Ceiling Fan vs Air Conditioning Savings CalculatorEstimate cooling cost savings from using ceiling fans to allow a higher AC thermostat setpoint.
Home Energy Cost Per Square Foot CalculatorCalculate your home's annual energy cost per square foot, a common efficiency benchmarking metric.
Paper vs Plastic Bag Footprint CalculatorCompare the manufacturing carbon footprint of paper, plastic, and reusable shopping bags across multiple uses.
Standby Power (Vampire Power) Cost CalculatorEstimate the annual cost of electricity consumed by devices left plugged in on standby.
Cold Water Laundry Savings CalculatorCalculate the energy savings from washing laundry in cold water instead of hot or warm.
Low-Flow Showerhead Savings CalculatorCalculate the water and energy savings from switching to a low-flow showerhead.
Drip Irrigation Water Savings CalculatorEstimate the water saved by switching a garden or landscape bed from sprinkler irrigation to drip irrigation.
Pool Cover Water Savings CalculatorEstimate the water saved by covering a swimming pool when it's not in use, based on evaporation rate and pool size.
Duct Sealing Savings CalculatorEstimate the annual heating and cooling cost savings from sealing leaky ductwork.
Window Heat Loss CalculatorCalculate the rate of heat loss through a window based on its U-value, area, and the indoor-outdoor temperature difference.
Tire Pressure Fuel Savings CalculatorEstimate the fuel and cost lost from driving on underinflated tires.
Engine Idling Fuel Waste CalculatorCalculate the fuel, cost, and emissions wasted from unnecessary engine idling.
E-Waste Recycling Value CalculatorEstimate the recoverable precious metal value from recycling old smartphones instead of throwing them away.
Packaging Waste Reduction CalculatorEstimate the annual cardboard and packaging waste diverted by switching to bulk buying or reduced packaging.
Embodied Carbon of Building Materials CalculatorEstimate the embodied carbon (manufacturing emissions) of common building materials based on quantity and material type.
Rain Garden Sizing CalculatorCalculate the recommended size for a rain garden based on the drainage area and your soil type.
Ecological Footprint CalculatorEstimate how many Earths would be needed if everyone lived like you, based on a simplified lifestyle survey.
Micro-Hydro Power Output CalculatorEstimate the power output of a small-scale (micro-hydro) hydroelectric system based on water flow rate and head height.
Cool Roof Energy Savings CalculatorEstimate the summer cooling cost savings from switching to a reflective (cool) roof coating.
Double-Pane Window Upgrade Savings CalculatorEstimate the annual heating and cooling cost savings from replacing single-pane windows with double-pane windows.
Wood Stove Efficiency Savings CalculatorCompare the annual firewood cost and usage between an old, inefficient wood stove and a modern EPA-certified stove.
Bike Commute Carbon Savings CalculatorCalculate the CO2 emissions avoided and calories burned by commuting by bicycle instead of driving.
Carbon Tax Cost EstimatorEstimate what a hypothetical carbon tax would add to your household's annual energy and fuel costs.
Recycled vs Virgin Material Energy Savings CalculatorCompare the manufacturing energy required to produce a material from recycled versus virgin (raw) sources.
Solar Water Heater Savings CalculatorEstimate the annual energy and cost savings from a solar water heating system compared to a conventional electric water heater.
Off-Grid Solar Battery Sizing CalculatorCalculate the battery bank size needed for an off-grid solar system based on daily energy use and desired backup days.
Plastic Bottle Carbon Footprint CalculatorEstimate the annual carbon footprint of single-use plastic water bottles compared to a reusable bottle.
Urban Tree Cooling Savings CalculatorEstimate the summer cooling cost savings from shade trees planted near a home.
Reforestation Carbon Sequestration CalculatorEstimate the total carbon sequestered by a reforestation project over a given number of years.
Electric vs Gas Lawn Equipment Savings CalculatorCompare the annual fuel/electricity cost and emissions of gas-powered versus battery-electric lawn equipment.
HVAC Filter Energy Savings CalculatorEstimate the energy cost impact of regularly replacing a dirty HVAC air filter versus letting it stay clogged.
Double-Sided Printing Paper Savings CalculatorEstimate the paper, cost, and tree impact saved by switching to double-sided (duplex) printing.
Video Call vs Business Travel Carbon Savings CalculatorEstimate the CO2 emissions avoided by replacing an in-person business trip with a video call.
Secondhand Clothing Carbon Savings CalculatorEstimate the CO2 emissions avoided by buying secondhand clothing instead of new.
Rainwater Cistern Sizing CalculatorCalculate the storage capacity needed for a rainwater cistern based on your roof area and local rainfall.
Farmers Market vs Supermarket Carbon Savings CalculatorEstimate the transportation emissions avoided by buying produce from a local farmers market instead of a supermarket.
Water Heater Temperature Savings CalculatorEstimate the energy savings from lowering your water heater's thermostat setting.
Radiant Barrier Attic Savings CalculatorEstimate the summer cooling savings from installing a radiant barrier in an attic.
ENERGY STAR Refrigerator Savings CalculatorEstimate the annual energy savings from replacing an old refrigerator with a new ENERGY STAR certified model.
Laptop vs Desktop Energy Savings CalculatorCompare the annual electricity cost of using a laptop versus a desktop computer.
Smart Power Strip Savings CalculatorEstimate the annual savings from using a smart power strip to eliminate standby (phantom) power draw from electronics.
Seasonal Produce Carbon Savings CalculatorEstimate the emissions avoided by choosing in-season, locally grown produce over out-of-season imported produce.
Soil Carbon Sequestration CalculatorEstimate the carbon sequestered in soil from regenerative farming or gardening practices over a given area and time period.
Solar Carport Output CalculatorEstimate the electricity output of a solar carport structure based on its size and local sun hours.
Biodiesel Emissions Savings CalculatorEstimate the CO2 emissions reduction from using a biodiesel blend instead of standard diesel fuel.
Food Donation Landfill Diversion CalculatorEstimate the landfill methane emissions avoided by donating surplus food instead of discarding it.
LED Holiday Lights Savings CalculatorCompare the electricity cost of incandescent versus LED holiday string lights.
Heat Recovery Ventilator Savings CalculatorEstimate the heating cost savings from installing a heat recovery ventilator (HRV) instead of using standard exhaust ventilation.
Electric Kettle vs Stovetop Savings CalculatorCompare the energy cost and time of boiling water with an electric kettle versus a stovetop.
Composting Toilet Water Savings CalculatorEstimate the water saved per year by using a composting toilet instead of a standard flush toilet.
Greenhouse Heating Cost CalculatorEstimate the heating cost to maintain a target temperature inside a greenhouse during cold weather.
Home Battery Carbon Payback CalculatorEstimate how many years it takes for a home battery's grid-charging emissions savings to offset its manufacturing carbon footprint.
Dehumidifier Energy Cost CalculatorEstimate the annual electricity cost of running a dehumidifier based on its size and usage.
Chest Freezer vs Upright Freezer Energy CalculatorCompare the annual electricity cost of a chest freezer versus an upright freezer of similar capacity.
Programmable Irrigation Controller Savings CalculatorEstimate the water savings from upgrading to a weather-based smart irrigation controller.

About Ecology & Green Energy Calculators

From estimating your household's carbon footprint to sizing a solar panel system for your actual electricity usage, these calculators use published emissions factors and real-world panel efficiency figures - not rounded rules of thumb - so the numbers hold up.