Biology Calculators (Page 4)
Genetics, ecology and physiology metrics — biology calculations.
Relative Growth Rate Calculator
Enter the initial and final dry weights and the time interval to compute relative growth rate RGR = (ln W₂ − ln W₁) / (t₂ − t₁), evaluating the daily dry-matter gain per unit existing dry weight.
Seed Vigor Index Calculator
Enter germination percentage and mean seedling length to compute the seed vigor index SVI = germination(%) × seedling length(cm) by the Abdul-Baki & Anderson method, assessing seed-batch vigor and quality.
Chlorophyll Content Calculator
Enter the SPAD reading and the calibration curve slope and intercept; by the linear model chlorophyll = slope × SPAD + intercept the tool estimates leaf chlorophyll content, to assess crop nitrogen status and growth.
Leaf Area Ratio Calculator
Enter total leaf area and total plant dry weight to compute the leaf area ratio LAR = total leaf area ÷ total dry weight, evaluating how efficiently biomass is invested in light-catching foliage.
Specific Growth Rate Calculator
Enter initial and final cell counts (or concentrations) and the time interval to compute specific growth rate μ = ln(N₂/N₁) ÷ Δt and doubling time td = ln2 ÷ μ, quantifying exponential-phase microbial proliferation.
Specific Root Length Calculator
Enter root length and root dry weight to compute specific root length SRL = root length ÷ root dry weight, evaluating root 'thinness' and the soil-exploration efficiency per unit biomass.
Transpiration Efficiency Calculator
Enter accumulated dry matter and transpired water to compute transpiration efficiency TE = dry matter ÷ transpiration, assessing how much dry matter a plant produces per unit water lost.
Stomatal Conductance Calculator
Enter transpiration rate and the leaf-to-air water vapor mole-fraction difference to compute stomatal conductance gs = E ÷ Δw, for quantifying stomatal aperture and plant water/gas-exchange status.
Relative Water Content Calculator
Enter fresh weight, dry weight, and turgid (saturated) weight to compute relative water content RWC = (Fresh − Dry) ÷ (Turgid − Dry) × 100%, quantifying leaf water deficit and drought tolerance.
Leaf Mass Fraction Calculator
Enter leaf dry weight and total plant dry weight to compute the leaf mass fraction LMF = leaf dry weight ÷ total dry weight (with percentage), evaluating the share of biomass allocated to leaves.
Osmotic Potential Calculator
Enter solute molarity, temperature, and dissociation coefficient to compute osmotic (solute) potential Ψs = −iCRT (MPa) via the van't Hoff equation, estimating a solution's water-attracting strength.
Leaf Water Potential Calculator
Enter osmotic potential Ψs (usually negative) and pressure potential Ψp (usually positive) to compute total leaf water potential Ψ = Ψs + Ψp (MPa), assessing plant water status and drought stress.