Measure your impact.
Protect the planet.
1,000 free calculators, planners and risk tools for water, carbon, energy, climate, disasters, and sustainability — with transparent methodology and location-aware results.
Critical tools
Most-used calculators
Household Water Footprint Calculator
Water Conservation & Household Use
Open tool →Daily Water Use Calculator
Water Conservation & Household Use
Open tool →Shower Water Usage Calculator
Water Conservation & Household Use
Open tool →Drinking Water Quality Index Calculator
Water Quality, Treatment & Sanitation
Open tool →Water Hardness Calculator
Water Quality, Treatment & Sanitation
Open tool →TDS Interpretation Tool
Water Quality, Treatment & Sanitation
Open tool →River Discharge Calculator
Rivers, Groundwater & Hydrology
Open tool →Streamflow Velocity Calculator
Rivers, Groundwater & Hydrology
Open tool →40 Categories
Explore by pillar
From water and air to disasters, energy, agriculture, and biodiversity — every corner of environmental science, made calculable.
Water Conservation & Household Use
25 tools · 3 MVP
Water Quality, Treatment & Sanitation
25 tools · 3 MVP
Rivers, Groundwater & Hydrology
25 tools · 3 MVP
Floods & Stormwater
25 tools · 3 MVP
Drought & Water Scarcity
25 tools · 3 MVP
Outdoor Air Quality & Pollution
25 tools · 3 MVP
Indoor Air, Ventilation & Healthy Buildings
25 tools · 3 MVP
Weather & Meteorology
25 tools · 3 MVP
Climate Change & Climate Trends
25 tools · 3 MVP
Personal & Household Carbon
25 tools · 3 MVP
Corporate GHG, ESG & Reporting
25 tools · 3 MVP
Carbon Equivalencies, Offsets & Removal
25 tools · 3 MVP
Solar Energy
25 tools · 3 MVP
Wind Energy
25 tools · 3 MVP
Hydropower, Tidal, Wave & Geothermal
25 tools · 3 MVP
Batteries, Storage, Hydrogen & Grid
25 tools · 3 MVP
Building Energy Efficiency
25 tools · 3 MVP
Heating, Cooling & Heat Pumps
25 tools · 3 MVP
Sustainable Transport & Electric Vehicles
25 tools · 3 MVP
Waste, Recycling & Circular Economy
25 tools · 3 MVP
Food, Diet & Agriculture Footprints
25 tools · 2 MVP
Soil, Crops & Irrigation
25 tools · 2 MVP
Trees, Planting & Urban Forestry
25 tools · 2 MVP
Forests, Deforestation & Wildland
25 tools · 2 MVP
Biodiversity, Wildlife & Ecosystems
25 tools · 2 MVP
Oceans & Marine Environment
25 tools · 2 MVP
Fisheries & Aquaculture
25 tools · 2 MVP
Sea Level, Coasts & Erosion
25 tools · 2 MVP
Wildfire, Fire Weather & Smoke
25 tools · 2 MVP
Disaster Preparedness & Resilience
25 tools · 2 MVP
Earthquakes, Landslides, Volcanoes & Tsunamis
25 tools · 2 MVP
Hurricanes, Tornadoes, Storms & Lightning
25 tools · 2 MVP
Green Construction & Materials
25 tools · 2 MVP
Sustainable Business & Supply Chains
25 tools · 2 MVP
Personal Green Lifestyle
25 tools · 2 MVP
Cities, Communities & Urban Sustainability
25 tools · 2 MVP
Plastics, Chemicals & Toxicity
25 tools · 2 MVP
Environmental Health & Exposure
25 tools · 2 MVP
Environmental Science, Units & Education
25 tools · 2 MVP
Climate Policy, SDGs & Green Finance
25 tools · 2 MVP
Transparent methods
Every calculator shows its formula, assumptions, and cited sources — EPA, IPCC, WHO, and peer-reviewed literature.
Location-aware
Results adapt to your country, climate zone, and grid mix so numbers reflect where you actually live.
Downloadable reports
Export professional PDF reports for school projects, ESG disclosures, or client audits.