Estimate population size with exponential or logistic growth models.
Calculator category
Biology Calculators
Use 22 deterministic Biology calculators for population genetics, DNA, lab dilution, cell counting, enzyme and assay workflows, biological rates and biodiversity. Inputs stay in the browser calculator session.
Last reviewed: August 5, 202622 live tools0 planned tools3 linked health tools25 inventory tools
Search biology calculators
Find live genetics, DNA, dilution, cell-culture, enzyme, ELISA, PCR and qPCR calculators.
25 calculators
Calculate doubling time from continuous or discrete growth rate.
Calculate p², 2pq and q² genotype frequencies from allele frequencies or q².
Calculate allele frequencies p and q from genotype counts or allele counts.
Estimate single-strand DNA molecular weight from A, T, G and C sequence counts.
Calculate GC percentage and AT percentage from DNA sequence or base counts.
Estimate DNA melting temperature with the Wallace rule or a basic GC formula.
Plan a biology stock dilution with C1V1 = C2V2 and calculate diluent volume.
Calculate each tube concentration and cumulative factor in a serial dilution.
Estimate cell-culture seeding volume, total cells or a culture split ratio.
Estimate bacterial population from generations, generation time or exponential growth.
Solve velocity, substrate, Vmax or Km with the Michaelis-Menten equation.
Calculate Michaelis-Menten velocity and percent of Vmax from Vmax, Km and substrate.
Estimate total osmolarity from solute molarity and assumed particle factors.
Calculate cells per mL from hemocytometer square counts and dilution factor.
Interpolate ELISA concentration with a linear standard curve and dilution correction.
Calculate PCR master-mix reagent volumes with reaction count and overage.
Calculate qPCR efficiency from slope or fit a Ct standard curve with R².
Calculate protein concentration from absorbance, dilution, sample volume or Beer-Lambert inputs.
Calculate photosynthesis rate from oxygen production, carbon dioxide uptake, time, area or mass.
Calculate respiration rate, mass-normalized rate, respiration quotient or Q10.
Calculate species richness, Shannon index, Simpson diversity and Pielou evenness.
BMI Calculator
LiveHealth canonical BMI calculator linked from Biology without a duplicate Biology route.
BSA Calculator
PlannedLinked-only Health inventory item for body surface area; no Biology duplicate route is created.
Dosage Calculator
PlannedLinked-only Health inventory item for dosage context; no Biology duplicate route is created.
Population and Genetics
Calculate simplified population growth, doubling time, Hardy-Weinberg frequencies and allele-frequency relationships.
Estimate population size with exponential or logistic growth models.
Calculate doubling time from continuous or discrete growth rate.
Calculate p², 2pq and q² genotype frequencies from allele frequencies or q².
Calculate allele frequencies p and q from genotype counts or allele counts.
DNA and Sequence Tools
Estimate local DNA sequence composition, molecular weight and melting temperature without external biology APIs.
Estimate single-strand DNA molecular weight from A, T, G and C sequence counts.
Calculate GC percentage and AT percentage from DNA sequence or base counts.
Estimate DNA melting temperature with the Wallace rule or a basic GC formula.
Biology Lab Dilution and Cell Culture
Plan stock and serial dilutions, cell-culture seeding or splitting, and simplified bacterial growth.
Plan a biology stock dilution with C1V1 = C2V2 and calculate diluent volume.
Calculate each tube concentration and cumulative factor in a serial dilution.
Estimate cell-culture seeding volume, total cells or a culture split ratio.
Estimate bacterial population from generations, generation time or exponential growth.
Enzyme and Molecular Biology Tools
Calculate enzyme relationships, osmolarity, chamber cell counts, ELISA interpolation, PCR mixes and qPCR efficiency.
Solve velocity, substrate, Vmax or Km with the Michaelis-Menten equation.
Calculate Michaelis-Menten velocity and percent of Vmax from Vmax, Km and substrate.
Estimate total osmolarity from solute molarity and assumed particle factors.
Calculate cells per mL from hemocytometer square counts and dilution factor.
Interpolate ELISA concentration with a linear standard curve and dilution correction.
Calculate PCR master-mix reagent volumes with reaction count and overage.
Calculate qPCR efficiency from slope or fit a Ct standard curve with R².
Calculate protein concentration from absorbance, dilution, sample volume or Beer-Lambert inputs.
Biological Process and Ecology Tools
Calculate photosynthesis, respiration and sampled-community biodiversity relationships.
Calculate photosynthesis rate from oxygen production, carbon dioxide uptake, time, area or mass.
Calculate respiration rate, mass-normalized rate, respiration quotient or Q10.
Calculate species richness, Shannon index, Simpson diversity and Pielou evenness.
Linked Health Tools
These tools are Biology inventory links only. Their canonical pages remain in Health, so NexaCalc does not create duplicate Biology routes for BMI, BSA or dosage.
BMI Calculator
LiveHealth canonical BMI calculator linked from Biology without a duplicate Biology route.
BSA Calculator
PlannedLinked-only Health inventory item for body surface area; no Biology duplicate route is created.
Dosage Calculator
PlannedLinked-only Health inventory item for dosage context; no Biology duplicate route is created.
What Biology calculators cover
The Biology hub contains 22 canonical calculators for population models, genetics, DNA sequence composition, dilution, cell culture, microbial growth, enzyme kinetics, molecular-lab planning, biological rates and biodiversity.
All approved canonical Biology tools are live. BMI, body surface area and dosage remain linked Health tools, so they appear for context without duplicate Biology routes.
How to choose the right Biology tool
Use Population Growth when you need exponential or logistic population estimates. Use Doubling Time when the question asks how long growth takes to double. Use Hardy-Weinberg for expected genotype frequencies and Allele Frequency when you have genotype or allele counts.
Use the DNA tools for sequence properties, the lab tools for dilution and assay planning, and the enzyme tools for Michaelis-Menten relationships. Protein Concentration supports assay interpolation, while Photosynthesis Rate, Respiration Rate and Biodiversity Index cover final biological-process workflows.
FAQs
What can I calculate with NexaCalc Biology Calculators?
You can calculate population and genetics relationships, DNA properties, dilution plans, cell counts, bacterial growth, enzyme kinetics, ELISA interpolation, PCR mixes and qPCR efficiency.
Which Biology calculators are live now?
All 22 canonical Biology calculators are live across population genetics, DNA, lab dilution, cell culture, molecular biology, biological rates and biodiversity.
Which Biology tools are still planned?
No canonical Biology calculators remain planned after Biology Phase 3. BMI, BSA and Dosage remain linked Health tools only.
Why are BMI, BSA and Dosage shown as linked Health tools?
Those tools are useful in biology-adjacent workflows, but their canonical category is Health. NexaCalc links them from Biology without creating duplicate Biology pages.
Do Biology calculators upload DNA or lab values?
No. These tools process entered values in the browser calculator flow and do not call external biology or assay APIs.
What is the difference between Population Growth and Doubling Time?
Population Growth estimates population size after an interval, while Doubling Time converts a growth rate into the time required for a population or culture to double.
What is the difference between Hardy-Weinberg and Allele Frequency calculators?
Hardy-Weinberg estimates expected genotype frequencies from allele frequencies or q squared. Allele Frequency calculates p and q from genotype or allele counts.
Can these Biology calculators be used for lab release decisions?
No. They are educational calculators and do not replace validated lab protocols, safety review, clinical interpretation or professional biological analysis.
How are Biology calculator formulas handled?
Calculator logic lives in pure TypeScript utilities with deterministic arithmetic. Page components render results, explanations and visuals from those utility outputs.
Are Biology visuals measured scientific diagrams?
No. Visuals explain the model and entered values. Proportions may be normalized for readability and should not be treated as measured biological scale.
Is the Biology category complete?
Yes. All 22 approved canonical Biology calculators are implemented; the three biology-adjacent Health tools remain linked to their Health canonical routes.
How are ecology-related calculations handled?
Biodiversity Index remains canonical in Biology for this inventory. Future Ecology pages should link to it instead of creating a duplicate calculator.
Related categories
Continue with related NexaCalc categories and canonical tools.