Environment Sustainability

Rainwater Collection Calculator

Calculate rainwater harvest volume, catchment area, rainfall depth, and collection efficiency. Free online rainwater harvesting calculator for home and farm.

Solid Waste Calculator

Calculate solid waste moisture content and landfill cover percolation rates using water-balance calculations.

AI Water Footprint Calculator

Estimate water and energy consumed by daily AI queries across popular large language models with relatable yearly comparisons.

Smog Calculator

Calculate how much benzoapyrene you inhale from city air and convert it into cigarette equivalence based on location and outdoor time.

Books vs E-Books Calculator

Compare CO2 emissions from paper books versus e-readers and see how many trees your reading habits would equal.

Carrying Capacity Calculator

Calculate ecological carrying capacity from population size, growth rate, and rate of change using the logistic equation.

Car vs Bike Calculator

Compare car and bike commuting to estimate CO2 reduction, money saved, extra life expectancy, and planted trees equivalent.

Cigarette Butts Cleanup Calculator

Estimate cigarette butts collected during cleanup events and see ocean water saved, plastic prevented, and toxicity impact.

CO2 Breathing Emission Calculator

Estimate indoor CO2 buildup from human breathing by room type, occupancy, and ventilation to assess air quality safety.

COVID-19 Waste Calculator

Estimate plastic waste and CO2 footprint from masks, gloves, and hand sanitizer use over time with eco-friendly alternatives.

Cryptocurrency Footprint Calculator

Estimate the environmental impact of cryptocurrency mining including CO2 emissions, energy consumption, and electronic waste generated per transaction.

Drip Faucet Calculator

Estimate how much water is wasted by leaking faucets in your home based on drip rate, and see the yearly water loss and cost impact.

Bag Footprint Calculator

Determine how many times you need to reuse alternative bags like cotton, paper, or jute to offset their environmental impact compared to single-use plastic bags.

Fish Mercury Calculator

Calculate how much mercury is in the fish you eat and determine how much you can safely consume per week based on FDA and EPA guidelines.

Flight Carbon Footprint Calculator

Estimate CO2 emissions from air travel based on flight duration, trip type, and seat occupancy with radiative forcing factor.

Global Plastic Policy Calculator

Compare plastic waste reduction from different policy strategies including bans, taxes, recycling, and extended producer responsibility by region.

Hand Drying Footprint Calculator

Compare the carbon footprint of hand drying methods including paper towels, cotton rolls, and electric dryers for offices and public restrooms.

Hydroelectric Power Calculator

Estimate hydroelectric power output for dam, run-of-river, and tidal turbines with revenue projections based on flow rate and head.

Kaya Identity Calculator

Calculate CO2 emissions using the Kaya identity equation from population, GDP per capita, energy intensity, and carbon footprint factors.

Lotka Volterra Calculator

Simulate predator-prey population dynamics using Lotka-Volterra equations with equilibrium points and oscillation period estimates.

Meat Footprint Calculator

Calculate the environmental impact of meat consumption including CO2 emissions, water use, land use, and pollution by meat type.

Olympic Games Sustainability Calculator

Evaluate Olympic Games sustainability across ecological, social, and economic dimensions using the Olympic Sustainability Model.

Passive House Savings Calculator

Compare regular, energy-efficient, and passive house construction costs and calculate heating savings payback period.

Plug-in Hybrid Economy Calculator

Compare plug-in hybrid fuel costs with a regular car and calculate real-world MPG and monthly savings.

Plastic Footprint Calculator

Calculate your yearly plastic footprint from bottles, bags, packaging, and disposable items with weight estimates.

Reduce Your Plastic Calculator

Set plastic reduction goals and see yearly savings in plastic weight, CO2, energy, and environmental impact.

Shannon Diversity Index Calculator

Calculate Shannon-Wiener diversity index, species richness, and evenness from population counts.

Tap Water Calculator

Compare bottled water costs with tap water and calculate long-term savings over 5 to 50 years.

Tree Benefits Calculator

Estimate oxygen production, carbon dioxide absorption, water evaporation, and energy savings from trees by species, size, and count.

Vegan Footprint Calculator

Calculate animal lives, water, grain, forest land, and CO2 saved based on how long you have been vegan.

Water Demand Calculator

Estimate average, maximum, and peak water demand for a population using liters or gallons per capita per day.

Wind Turbine Calculator

Calculate wind turbine power output, efficiency, torque, RPM, and revenue for horizontal or vertical axis turbines.

Wind Turbine Profit Calculator

Calculate daily wind turbine profit from energy output, electricity price, and operating costs with optional power generation estimates.

Christmas Tree Footprint Calculator

Compare carbon footprint of natural, artificial, and low-waste Christmas tree options including transport and disposal.

Bath vs Shower Footprint

Compare water usage between baths and showers. Calculate how much water you use with customizable shower flow rates, durations, frequencies, and bathtub sizes.

Coronavirus Mask Calculator

Calculate how many face masks or filters you need and their total cost based on mask type, daily usage hours, and duration. Plan your mask supply efficiently.

Flight Radiation Calculator

Calculate your cosmic radiation exposure during airplane flights and compare it to medical X-rays and other common radiation sources.