Environment calculators
6 free tools
Practical calculators for the greener side of everyday life — see what an appliance really costs to run, roughly size up your yearly carbon footprint, check whether solar pays off, and tally the water flowing through your home. Every tool states the emission factors and assumptions it uses so you know exactly where the numbers come from.
Estimate your annual carbon footprint in tonnes of CO2e from car miles, flights, home electricity, and diet.
See what an appliance costs to run per day, month, and year from its wattage, daily hours, and your price per kWh.
Find the cost to charge an EV and the cost per mile from battery size, charge levels, price per kWh, and efficiency.
Estimate your household's daily, monthly, and yearly water use from showers, flushes, laundry, and dishwashing.
Estimate annual solar production, yearly savings, and payback period from system size, sun hours, price, and cost.
Find how many trees it takes to offset a given amount of CO2 per year, assuming about 21 kg absorbed per tree annually.
Frequently asked questions
How accurate are these estimates?
They use widely published averages, like the EPA figure for car emissions and typical grid-electricity intensity. That makes them good for comparisons and rough planning, but your real numbers depend on your utility, climate, and habits.
Where do the emission and usage factors come from?
Each calculator spells out the factors it relies on right on the page — things like kilograms of CO₂ per mile driven or gallons of water per shower. We chose commonly cited, mainstream values rather than best- or worst-case extremes.
Can I trust the money figures to plan a budget?
Use them as ballparks. Electricity and fuel prices move, incentives change, and equipment ages, so revisit the numbers with your latest bill or quote before committing to a big purchase like solar panels.