Environment calculator glossary: energy & climate terms

AI Carbon Footprint estimates energy, carbon, and water behind AI use: prompts/day into annual kWh, kg CO2, and gallons, with equivalents by model and grid region.

Air Purifier Room Size determines air purifier CADR required for room and target air changes per hour, or check the max room size a purifier you own can clean.

Appliance Energy calculates how much electricity an appliance uses in kWh and dollars per day, month, and year — and compares appliances side by side.

AQI Health Impact converts AQI or PM2.5 readings into cigarette-equivalent exposure and age-adjusted health risk.

Biodiversity Impact calculates biodiversity footprint — land use, species-equivalents, and planetary boundary impact from diet, flights, and garden habitat.

Biogas Yield estimates biogas yield in cubic meters from feedstock volatile solids and biogas potential, for digester sizing.

Business GHG Emissions calculates business Scope 1, 2 & 3 greenhouse gas emissions in metric tons CO2e.

Carbon Footprint estimates annual carbon footprint in tons of CO2.

Carbon Offset estimates trees and cost to offset carbon emissions.

Recommended coop and run square footage for flock, plus nesting boxes and roosting bar length.

Circular Economy Impact calculates annual recycling impact across 6 material types — CO₂ saved, energy recovered, water conserved, and landfill diverted.

Compost Savings calculates compost output, fertilizer savings, landfill methane avoided, and the full cost-benefit of home composting.

Bushels per acre using the ear-count method from ears per acre, kernel rows, kernels per row, and a yield factor.

Deforestation Impact calculates lost carbon storage, oxygen production, and ecosystem value for any deforested area.

E-Bike Commute Savings calculates how much an e-bike saves vs driving: cost per mile, purchase payback, and CO2 avoided, including partial trip replacement or ditching a second car.

Eco Driving Fuel Savings calculates how much gas money and CO₂ you can save by fixing bad driving habits like speeding, hard braking, and idling.

Footprint in global hectares from diet, housing, transport, and consumption, compared to Earth's biocapacity.

EV Charging Cost calculates EV charging cost per day, month, and year vs. gasoline and DC fast charging.

Reference ET0 using the Hargreaves equation from temperature and extraterrestrial radiation, for irrigation scheduling.

Pounds of fertilizer product to hit a target nitrogen rate, from the NPK analysis on the bag and area.

Flight Carbon calculates CO2 emissions from air travel by distance.

Food Miles Carbon calculates farm-to-table carbon footprint of food by transport mode, distance, and food type.

Food Waste Cost estimates food waste cost and environmental impact.

Coefficient of performance from ground and output temperatures, compared to electric resistance heating.

Green Building Cost compares green vs. conventional building costs, energy savings, and payback period.

BTU/hr heating requirement from surface area, the temperature difference to maintain, and the covering's U-value.

GDD from daily high and low temperatures and a base temperature, to track crop and pest development.

How many hay bales required to feed herd over winter, from animal count, consumption rate, and bale weight.

Heat Pump Savings compares heat pump heating cost and payback vs gas, oil, propane, or electric resistance, with 2026 incentives, dual-fuel crossover, and CO2 savings.

Heat Pump Water Heater ROI evaluates whether a heat pump water heater pays off: yearly energy savings vs current water heater, payback with 2026 incentives, and CO2 reduction.

Home Battery Backup calculates how long a home battery backup will power house during an outage, based on usable capacity and load.

Home Energy Audit estimates annual energy costs, EUI grade, and ranked home upgrade recommendations with payback periods.

Get kW output and annual energy from water flow rate, head height, and turbine efficiency using P = ρ·g·Q·H·η.

Stocking rate is one of the highest-leverage decisions in pasture-based livestock management.

Lotka-Volterra Predator-Prey simulates predator-prey population dynamics over time from growth, predation, and death rate parameters.

Getting plant spacing right is the difference between a bed that produces a full harvest and one where crowded plants.

Plastic Footprint calculates annual plastic footprint — total pieces, weight, CO₂ equivalent, and ocean pollution impact.

Rainwater Collection estimates rainwater harvesting potential from roof.

Cubic feet or cubic yards of soil needed to fill a raised garden bed from length, width, and depth.

Recycling Savings calculates environmental and financial savings from recycling.

Renewable Energy Payback calculates simple payback, discounted payback, IRR, NPV, and 25-year ROI for Solar PV, Solar Thermal, Small Wind, Geothermal, or Heat Pump investments.

Pounds of seed per acre from seeds per pound, desired plant population, and germination/emergence rate.

H and evenness from species counts, a common biodiversity measure for ecology surveys.

D and 1-D from species counts, measuring the probability two random individuals differ (biodiversity).

Solar battery storage uses a battery to save electricity for later use. System sizing depends on energy demand, backup duration, solar production, battery capacity, and usable depth of discharge.

Solar Panel Savings estimates solar panel savings, system size, payback, and ROI after the federal tax credit.

This calculator converts three panel specs — area, irradiance, and efficiency.

Solar ROI Detailed calculates detailed solar panel ROI with NPV and IRR.

Discharge from cross-sectional area and average water velocity using Q = A × v (continuity equation).

The fraction of solar radiation reflected from reflected and incident radiation, or common material lookup values.

Sustainability Score scores lifestyle 0-100 across transport, diet, home, shopping, and water. See grade, percentile vs average American, and top eco improvement tips.

Tree Age estimates tree's age from its trunk diameter (DBH) and species growth factor, without counting tree rings.

Annual CO2 absorption, stormwater interception, and energy-savings value of a tree from species and trunk diameter.

Measuring a standing tree's height without climbing it is a classic forestry and arborist technique: pace off a known.

Tree Planting Carbon calculates how many trees to plant to offset carbon footprint.

Water Conservation determines biggest household water uses and rank fixture upgrades by bill savings.

Water Usage tracks daily water usage and finds ways to conserve.

Wave power per meter of wave front from significant wave height and wave period (deep-water approximation).

Wind Energy calculates annual wind energy production, savings, and payback period.

Power output from wind speed, rotor swept area, air density, and power coefficient (P = ½ρAv³Cp).