Passive House Savings Calculator
Compares regular, energy-efficient, and passive-house construction/heating scenarios and simple payback. Passive-house demand defaults to 15 kWh/m²/year.
Archive
Calculator Group: Ecology
Shannon Diversity Index Calculator
Calculates Shannon diversity, species richness, Pielou evenness, total abundance, and average abundance from up to 40 population counts.
Smog Calculator
Benzo[a]pyrene is one component of combustion-related air pollution, and inhaled dose depends on concentration as well as time spent indoors and outdoors. This calculator…
Olympic Games Sustainability Calculator
Sustainability at a mega-event spans ecological, social, and economic questions that cannot be captured by one physical unit. This calculator treats them as a…
Plug-in Hybrid Economy Calculator
Uses the 20 published 2017 PHEV presets plus short/long trip distributions to estimate battery/gas distance, combined MPGe, monthly operating cost, savings versus a regular…
Tap Water Calculator
The price difference between tap and bottled water can be surprisingly large once a daily habit is projected across a household and a full…
Tree Benefits Calculator
Uses trunk circumference to estimate DBH and biomass, then reports modeled carbon/CO₂, oxygen, water evaporation, and energy-cost savings for eight tree types.
Water Demand Calculator
Water systems are designed for more than an average day. Utilities need to account for normal per-capita demand, an additional allowance, maximum-day conditions, and…
Carrying Capacity Calculator
Carrying capacity is often introduced as a fixed ecological ceiling, but in a logistic-growth model it can also be inferred from how fast a…
CO₂ Breathing Emission Calculator
Estimates indoor CO₂ concentration from people, activity, time, outdoor CO₂, room volume, and ventilation using a well-mixed room mass-balance model.