Fish Mercury Calculator
Calculates mercury per serving and compares it with the weekly EPA reference-dose equivalent for body weight.
Archive
Calculator Group: Ecology
Lotka-Volterra Calculator
Numerically integrates the classic Lotka–Volterra predator–prey equations and reports final and peak populations.
Wind Turbine Calculator
Wind power is extremely sensitive to wind speed, so a small change in the assumed breeze can create a large change in predicted output.…
Wind Turbine Profit Calculator
A wind turbine can produce plenty of energy and still be a poor economic fit if the electricity value is low or daily ownership…
Books vs e-Books Calculator
The climate comparison between paper books and an e-reader depends heavily on how much the device is actually used. A device has a manufacturing…
Car vs. Bike Calculator
Estimates cycling time/life-gain equivalent, CO₂ and NOₓ avoided, tree equivalents, commute-time difference, and car costs avoided over a chosen horizon.
Cigarette Butts Cleanup Calculator
Cigarette butts are individually tiny but can dominate litter counts in heavily polluted areas. This calculator approaches the problem from a cleanup crew’s point…
Drip Faucet Calculator
A faucet that drips only a few times each minute can look harmless because each drop is tiny. Over days and weeks, however, the…
Global Plastic Policy Calculator
Applies a selected or custom plastic-policy scenario to regional waste generation and reports waste avoided and remaining.
Solar Panel Calculator
A rooftop solar system is usually sized backward from the electricity you want it to produce. This calculator starts with annual consumption and available…