Ecology Calculators (Page 7)
Carbon footprint, energy use and other environmental calculations.
Relative Humidity
Enter air temperature and dew-point, compute relative humidity RH = es(dew)/es(temp) × 100% via the Tetens saturation vapor-pressure formula, plus actual and saturation vapor pressure.
Psychrometric-Constant Calculator
Compute Atmospheric Pressure, Latent Heat, Psychrometric Constant from Atmospheric Pressure, Latent Heat, Psychrometric Constant. Free online Hong Kong ecology calculator.
Carbon Footprint Calculator
Enter an activity amount (e.g. electricity kWh) and the corresponding emission factor to compute the carbon footprint CF = activity × emission factor (kg CO₂e), quantifying greenhouse-gas emissions of that activity.
Shannon-Diversity Calculator
Compute N1, N2, N3, N4, Shannon, Evenness from N1, N2, N3, N4. Free online Hong Kong ecology calculator.
Rainwater Harvesting
Enter catchment area, rainfall and runoff coefficient to compute collectible rainwater V = area × rainfall × runoff coefficient (litres and m³), estimating rainwater-recycling potential.
Tree Carbon Sequestration
Enter tree dry biomass and carbon fraction to compute carbon stock (C = biomass × fraction) and CO₂ equivalent (CO₂ = C × 44/12), assessing a tree's carbon contribution.
Biochemical Oxygen Demand Calculator
Enter the dissolved oxygen before and after incubation and the dilution factor to compute biochemical oxygen demand BOD = (DO_initial − DO_final) × dilution factor (mg/L), assessing organic pollution.
Heat-Index Calculator
Compute Temperature C, Relative Humidity Pct, Heat Index C, Heat Index F, Risk Level from Temperature C, Relative Humidity Pct, Heat Index C, Heat Index F. Free online Hong Kong ecology calculator.
Cloud Base Height Calculator
Enter surface air temperature and dew point to estimate cumulus cloud base height. About 125 m per 1°C difference. Hong Kong 30°C, dew point 24°C → cloud base ≈ 750 m.