Aquarium Salt Calculator
The Aquarium Salt Calculator calculates precise salt doses for freshwater and marine aquaria based on volume and target salinity.
Biology
Explore our biology calculators designed to simplify complex biological concepts. From genetics to ecology and cell biology, these tools provide accurate calculations to support your studies and research.
Browse our 40 calculators to solve common problems in Biology — from quick estimates to detailed results. This hub links to our most-used tools and guides so you can get answers fast.
Start with the popular picks below, or jump into the full list for more specific use cases.
Dead Space Ventilation Calculator
The Dead Space Ventilation Calculator estimates dead space fraction and ventilation efficiency using Bohr or Enghoff equations from carbon dioxide measurements.
Fixation Index Calculator
The Fixation Index Calculator calculates FST to quantify genetic differentiation between populations from allele frequency data and sample sizes.
Deer Weight Calculator
The Deer Weight Calculator estimates live body mass from chest girth and body length measurements, aiding wildlife researchers in population health assessments.
Goldfish per Gallon Calculator
The Goldfish per Gallon Calculator estimates safe stocking levels by modelling bioload from tank volume, fish size, and filtration efficiency.
Cremation Weight Calculator
The Cremation Weight Calculator predicts ash weight from body weight, sex, stature, and skeletal biology.
FRET Distance Calculator
The FRET Distance Calculator calculates donor-acceptor distances from FRET efficiency using the Förster radius, quantum yield and orientation factor.
Accumulated Degree Days Calculator
The Accumulated Degree Days Calculator computes cumulative heat units from temperature records to predict insect development, disease risk, and plant phenology.
Extraction Ratio Calculator
The Extraction Ratio Calculator calculates hepatic or renal extraction ratio from arterial and venous concentrations to assess physiological clearance.
Centimorgan to Percentage Converter
The Centimorgan to Percentage Converter converts Centimorgan to Percentage and helps interpret recombination frequencies in genetic linkage and mapping analyses.
Crop Water Stress Index Calculator
The Crop Water Stress Index Calculator calculates plant water stress from canopy and air temperatures, vapour pressure deficit, and calibration baselines.
dN/dS Ratio Calculator
The dN/dS Ratio Calculator computes non-synonymous to synonymous substitution ratios from coding sequence alignments to infer selection pressure.
Anogenital Ratio Calculator
The Anogenital Ratio Calculator calculates anogenital ratio from measured anogenital distance and body size, supporting sex differentiation and endocrine toxicity assessments.
Corn Heat Units Calculator
The Corn Heat Units Calculator calculates accumulated heat units from daily maximum and minimum temperatures to predict maize growth stages and maturity.
Intrinsic Membrane Resistance Calculator
The Intrinsic Membrane Resistance Calculator estimates neuronal intrinsic membrane resistance from basic electrophysiological measurements, aiding interpretation of passive membrane properties in experiments.
Cardiac Perfusion Pressure Calculator
The Cardiac Perfusion Pressure Calculator calculates myocardial perfusion pressure using diastolic aortic pressure minus right atrial or left ventricular end-diastolic pressure.
Fat Corrected Milk Calculator
The Fat Corrected Milk Calculator standardises milk output to a reference fat percentage for comparing dairy herd performance.
FWHR Calculator
The FWHR Calculator computes facial width-to-height ratio using bizygomatic width and upper face height for morphological studies.
Bacterial Growth Rate Calculator
The Bacterial Growth Rate Calculator estimates exponential growth rate and doubling time from optical density or viable cell count measurements.