Biology Calculators
90 calculators across all biology domains
Hardy-Weinberg Equilibrium
Calculate allele frequencies under HWE
p² + 2pq + q² = 1
Allele Frequency Calculator
Calculate allele frequencies from genotype counts
p = (2n_AA + n_Aa)/(2N), q = 1-p
Punnett Square (Monohybrid)
Calculate offspring genotype ratios from a monohybrid cross
Aa × Aa → 1:2:1 genotype ratio
Genome Coverage Calculator
Calculate sequencing depth coverage
Coverage = (read_length × read_count) / genome_size
Primer Melting Temperature (Tm)
Calculate Tm for DNA primers using %GC method
Tm = 64.9 + 41×(G+C-16.4)/(A+T+G+C)
GC Content Calculator
Calculate GC percentage of a DNA sequence
GC% = (G+C)/(A+T+G+C) × 100%
PCR Master Mix Calculator
Calculate volumes needed for PCR reaction
V_total = ΣV_components
Codon Frequency
Calculate codon usage frequency
Frequency per thousand codons
Genetic Map Distance (cM)
Calculate recombination frequency and map distance
cM = RF × 100
Linkage Disequilibrium (D)
Calculate LD between two loci
D = P_AB - P_A × P_B
Simpson's Diversity Index
Calculate species diversity in a community
D = 1 - Σ(n/N)²
Shannon-Wiener Index
Calculate species diversity using Shannon index
H' = -Σp_i × ln(p_i)
Mark-Recapture (Lincoln-Petersen)
Estimate population size
N = (M × C)/R
Exponential Population Growth
Calculate population size after time t
N(t) = N₀e^(rt)
Logistic Population Growth
Calculate population with carrying capacity
dN/dt = rN(1 - N/K)
Species Richness (Margalef)
Calculate species richness index
R = (S-1)/ln(N)
Trophic Level Energy Transfer
Calculate energy at each trophic level
E_n = E₀ × (TE)ⁿ
Population Doubling Time
Calculate time for population to double
t₂ = ln(2)/r
Species-Area Relationship
Predict number of species on an island
S = c × A^z
Cardiac Output
Calculate cardiac output from heart rate and stroke volume
CO = HR × SV
GFR (CKD-EPI Equation)
Estimated glomerular filtration rate
CKD-EPI equation
Body Surface Area (BSA)
Calculate BSA using Mosteller formula
BSA = √(height × weight / 3600)
Mean Arterial Pressure (MAP)
Calculate MAP from systolic and diastolic BP
MAP = DP + ⅓(SP - DP)
VO₂ Max (Non-exercise)
Estimate VO₂ max from age, gender, BMI
VO₂max = 56.363 - 0.369 × age...
Anion Gap
Calculate anion gap from electrolytes
AG = Na⁺ - (Cl⁻ + HCO₃⁻)
Plasma Osmolarity
Calculate plasma osmolarity
Osm = 2Na + Glucose/18 + BUN/2.8
Tidal Volume (IBW)
Calculate ideal tidal volume from height
Vt = 6-8 mL/kg IBW
Alveolar Gas Equation
Calculate alveolar oxygen partial pressure
P_AO₂ = P_IO₂ - PaCO₂/RQ
Nerve Conduction Velocity
Calculate nerve conduction velocity
v = distance/time
Michaelis-Menten Kinetics
Calculate reaction velocity from substrate concentration
V = Vmax × [S]/(Km + [S])
Lineweaver-Burk Plot
Calculate 1/V from 1/[S] for Lineweaver-Burk plot
1/V = Km/Vmax × 1/[S] + 1/Vmax
Protein Molecular Weight
Estimate protein MW from number of amino acids
MW ~ 110 × n (average)
Enzyme Specific Activity
Calculate specific activity of an enzyme
SA = activity / protein_mass
Binding Affinity (Kd Calculator)
Calculate dissociation constant from binding data
Kd = [L] at half-max binding
IC₅₀ Calculator (Hill Equation)
Calculate inhibition percentage at given concentration
Response = 100/(1 + (IC₅₀/[I])^n)
Turnover Number (kcat)
Calculate kcat from Vmax and enzyme concentration
kcat = Vmax/[E]ₜ
Beer-Lambert (Biochemistry)
Calculate protein concentration from A₂₈₀
c = A/(ε × l)
CFU/mL Calculator
Calculate colony-forming units per mL
CFU/mL = colonies / (dilution × volume)
Bacterial Doubling Time
Calculate doubling time from growth curve
t_d = ln(2) / k
MIC (Minimum Inhibitory Concentration)
Determine MIC from dilution series
Lowest concentration with no growth
Serial Dilution Calculator
Calculate concentration after serial dilutions
C_final = C_initial × DFⁿ
Viable Cell Count (Trypan Blue)
Calculate viable cell count and viability
Viability = live/(live+dead) × 100%
Mutation Frequency
Calculate mutation frequency
MF = mutants / total_cells
dN/dS Ratio
Calculate ratio of nonsynonymous to synonymous substitutions
ω = dN/dS
Molecular Clock
Calculate divergence time from genetic distance
T = d/(2μ)
Fixation Index (Fst)
Calculate population differentiation from Fst
Fst = 1 - Hs/Ht
Nucleotide Diversity (π)
Calculate average pairwise nucleotide diversity
π = Σ(differences)/(n×(n-1)/2)
Effective Population Size (Ne)
Estimate effective population size from census size
Ne = (4NmNf)/(Nm+Nf)
Heritability (h²)
Calculate heritability from parent-offspring regression
h² = slope of offspring vs parent
Selection Coefficient (s)
Calculate selection coefficient from fitness
s = 1 - w
Neural Spike Frequency
Calculate firing rate from spike count
f = spikes/time
Synaptic Strength
Calculate synaptic strength change (STDP)
Δw = A × exp(-Δt/τ)
EEG Band Power
Calculate EEG frequency band power
Power from spectral analysis
Leaf Area Index (LAI)
Calculate LAI from light interception
LAI = -ln(1-f)/k
Photosynthetic Rate (Net)
Calculate net photosynthetic rate from CO₂ exchange
Pn = (CO₂_in - CO₂_out) × flow/leaf_area
Water Use Efficiency (WUE)
Calculate WUE from photosynthesis and transpiration
WUE = Pn/E
Relative Growth Rate (RGR)
Calculate plant growth rate
RGR = (ln W₂ - ln W₁)/(t₂-t₁)
Seed Germination Rate
Calculate seed germination percentage
% = (germinated/total) × 100%
Stomatal Conductance
Calculate stomatal conductance from leaf temperature
g_s = E/(D × VPD)
Body Mass Index (BMI)
Calculate BMI from height and weight
BMI = kg/m²
Blood Pressure Classification
Classify blood pressure reading
Systolic/Diastolic classification
Cholesterol Ratio
Calculate total cholesterol/HDL ratio
Ratio = Total/HDL
AST/ALT Ratio (De Ritis)
Calculate AST/ALT ratio for liver assessment
AST/ALT ratio
Corrected Calcium
Calculate corrected calcium for low albumin
Ca_corr = Ca + 0.8×(4 - Albumin)
QALY Calculator
Calculate Quality-Adjusted Life Years
QALY = Life Years × Utility
LD₅₀ Converter
Convert LD₅₀ between units
Conversion for toxicology
Tumor Doubling Time
Calculate tumor volume doubling time
VDT = t × ln(2)/ln(V₂/V₁)
Ecological Footprint
Estimate personal ecological footprint (simplified)
Carbon + food + housing + transport
Ponderal Index
Calculate ponderal index
PI = kg/m³
Metabolic Syndrome Check
Check metabolic syndrome criteria
ATP III criteria
Herd Immunity Threshold
Calculate the vaccination coverage needed to achieve herd immunity
HIT = (1 - 1/R₀) / VE
Viral Titer (PFU/mL)
Calculate viral titer from plaque assay results
PFU/mL = plaques / (dilution × volume)
ELISA Titer Calculator
Calculate sample-to-cutoff ratio and estimate antibody titer
S/CO = Sample OD / Cutoff OD
Drug Half-Life Calculator
Calculate elimination half-life and rate constant from concentration data
t½ = -ln(2) × t / ln(Cₜ/C₀)
Creatinine Clearance (Cockcroft-Gault)
Estimate creatinine clearance for renal function assessment
CrCl = [(140-age)×wt]/(72×Cr) × 0.85 if female
Sensitivity & Specificity
Calculate diagnostic test performance metrics from 2x2 table
Sens = TP/(TP+FN), Spec = TN/(TN+FP)
Relative Risk & Odds Ratio
Calculate relative risk, odds ratio, and attributable risk from cohort data
RR = (a/(a+b))/(c/(c+d)), OR = ad/bc
Incidence Rate & Prevalence
Calculate disease prevalence and incidence rate
Prev = existing/pop, Inc = new/(pop × time)
qPCR ΔΔCt (Relative Quantification)
Calculate relative gene expression using the comparative Ct method
RQ = 2^(-ΔΔCt)
Hemocytometer Cell Count
Calculate cell concentration and viability using a hemocytometer
Cells/mL = (cells/grids) × dilution × 10⁴
Seeding Density Calculator
Calculate cell suspension volume needed for desired plating density
V = (density × area) / concentration
Restriction Enzyme Digest
Calculate enzyme volume needed for DNA restriction digest
Units needed = DNA (μg) × 5-10 U/μg
Feed Conversion Ratio (FCR)
Calculate feed efficiency in aquaculture and livestock
FCR = feed intake / weight gain
Dissolved Oxygen Saturation
Calculate DO saturation concentration and percent saturation
DO_sat = f(temp, salinity)
Coral Calcification Rate
Calculate coral calcification rate from buoyant weight
G = (W₂-W₁)/(t × SA)
Salinity Conversion
Convert between conductivity and practical salinity units
PSU from conductivity ratio
Water Quality Index (WQI)
Calculate simplified water quality index from key parameters
WQI = Σ(wi × qi)
Pielou's Evenness (J')
Calculate species evenness from Shannon diversity
J' = H'/ln(S)
Degree-Day Calculator (GDD)
Calculate growing degree days for plant and insect development
GDD = ((Tmax+Tmin)/2) - Tbase
Body Condition Index (BCI)
Estimate body condition from weight and length measurements
BCI = weight / length^b × k
Save Configuration Snapshot
Save current parameters to your dashboard for instant one-click reloading.
About This Calculator & Guide
About the All Biologys Calculator
The All Biologys Calculator is a specialized online utility designed to help you browse all biology calculators — genetics, ecology, physiology, biochemistry, microbiology, evolutionary biology, neuroscience. It performs calculations in real-time to provide immediate, reliable estimates for study, work, or daily tasks.
How to Use
Simply enter your parameters in the input fields of the calculator widget above. The tool evaluates the inputs instantly and displays the results in real-time. You can modify any value to check alternate scenarios and compare figures dynamically.
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FAQ
Frequently Asked Questions
What does the All Biology Calculators do?+
Browse all biology calculators — genetics, ecology, physiology, biochemistry, microbiology, evolutionary biology, neuroscience It is designed for quick everyday use and gives clear results without requiring a sign in.
Is the All Biology Calculators free to use?+
Yes. The All Biology Calculators is free to use online and works directly in your browser.
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Yes. The calculator layout is responsive, so you can use it on phones, tablets, laptops, and desktop screens.