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Biology Calculators

Genetics, population, ecology, and life science tools. — 115 calculators available.

Acres per Hour Calculator
Calculate acres covered per hour from speed, swath width, and field efficiency.
Allele Frequency Calculator
Calculate allele frequencies from genotype counts.
Animal Mortality Rate Calculator
Compute mortality and survival rates from deaths and starting population.
Annealing Temperature Calculator
Estimate PCR annealing temperature from primer Tm values using an offset below the lowest Tm.
Bacteria Growth Calculator
Free online Bacteria Growth Calculator. Quickly calculate and get instant results.
Basal Area Calculator
Calculate tree basal area (ft²) from DBH in inches.
Benadryl Dosage for Dogs Calculator
Free online Benadryl Dosage for Dogs Calculator. Quickly calculate and get instant results.
Bird Age Calculator
Free online Bird Age Calculator. Quickly calculate and get instant results.
Blood Type Inheritance
Predict possible blood types of offspring.
Bulb Spacing Calculator
Compute bulb spacing from bulb diameter and estimate how many bulbs fit along a bed length.
CO2 Grow Room Calculator
Estimate CO2 mass needed to raise a grow room from current to target ppm using ideal gas law.
Cat Age Calculator
Free online Cat Age Calculator. Quickly calculate and get instant results.
Cat BMI Calculator
Estimates a cat's BMI using weight (kg) and body length (cm).
Cat Benadryl Dosage Calculator
Free online Cat Benadryl Dosage Calculator. Quickly calculate and get instant results.
Cat Calorie Calculator
Free online Cat Calorie Calculator. Quickly calculate and get instant results.
Cat Chocolate Toxicity Calculator
Computes total theobromine and mg/kg dose based on cat weight, amount eaten, and chocolate potency.
Cat Pregnancy Calculator
Free online Cat Pregnancy Calculator. Quickly calculate and get instant results.
Cat Quality of Life Calculator
Sums 7 quality-of-life domains (0–10 each) and reports total, average, and percent of maximum.
Catculator Calculator
Estimates daily grams of cat food needed after accounting for treat calories and food energy density.
Cattle per Acre Calculator
Estimates supported cattle numbers and stocking rate from forage supply, utilization, intake, and grazing days.
Cell Density Calculator
Calculate cell concentration.
Cell Dilution Calculator
Free online Cell Dilution Calculator. Quickly calculate and get instant results.
Cell Division Calculator
Calculate cells after mitotic divisions.
Cell Doubling Time Calculator
Free online Cell Doubling Time Calculator. Quickly calculate and get instant results.
Cephalexin for Cats Dosage Calculator
Free online Cephalexin for Cats Dosage Calculator. Quickly calculate and get instant results.
Cephalexin for Dogs Dosage Calculator
Free online Cephalexin for Dogs Dosage Calculator. Quickly calculate and get instant results.
Corn Yield Calculator
Estimate corn yield (bu/acre) from ear counts and kernel counts using kernels-per-bushel adjustment.
Cow Gestation Calculator
Free online Cow Gestation Calculator. Quickly calculate and get instant results.
Cricket Chirp Thermometer Calculator
Estimate air temperature from cricket chirps using Dolbear’s law (based on chirps per second).
DNA Base Pair Calculator
Calculate DNA properties from sequence length.
DNA Concentration Calculator
Estimate DNA concentration from A260, dilution factor, and DNA type (dsDNA/ssDNA/oligo).
DNA Copy Number Calculator
Compute DNA copy number from concentration (ng/µL), fragment length (bp), and volume using 660 g/mol per bp.
DNA to MRNA Calculator
Convert DNA length to mRNA coding length and estimated protein amino-acid length (triplet codons; optional stop codon).
Daily Light Integral DLI Calculator
Convert PPFD and photoperiod into Daily Light Integral (mol/m²/day).
Dihybrid Cross Punnett Square Calculator
Dihybrid Punnett squares require discrete genotype mapping; use a logic/table-based engine rather than expressions.
Dilution Factor Calculator
Calculate the dilution factor.
Dog Age Calculator
Free online Dog Age Calculator. Quickly calculate and get instant results.
Dog BMI Calculator
Estimate a dog BMI-like index using weight divided by (body length × height at withers).
Dog Calorie Calculator
Free online Dog Calorie Calculator. Quickly calculate and get instant results.
Dog Chocolate Toxicity Calculator
Estimate theobromine dose (mg/kg) from chocolate type and amount to gauge potential toxicity risk in dogs.
Dog Crate Size Calculator
Estimates minimum dog crate length and height from body length and shoulder height with user-set allowances.
Dog Food Calculator
Free online Dog Food Calculator. Quickly calculate and get instant results.
Dog Harness Size Calculator
Computes recommended harness neck and chest-girth settings by adding a user-defined comfort allowance.
Dog Heat Cycle Calculator
Estimates key heat-cycle timing (fertile window and ovulation) from the first day of bleeding using typical day offsets.
Dog Life Expectancy Calculator
Estimates remaining years and percent of expected lifespan completed from current age and an expected lifespan estimate.
Dog Metacam Calculator
Calculates meloxicam (Metacam) dose in mg and mL from dog weight, mg/kg dose, and product concentration.
Dog Onion Toxicity Calculator
Estimates onion dose (mg/kg and g/kg) and percent of a 5 g/kg reference level based on dog weight.
Dog Pregnancy Calculator
Free online Dog Pregnancy Calculator. Quickly calculate and get instant results.
Dog Quality of Life Calculator
Sums 7 common 0–10 quality-of-life ratings (HHHHHMM-style) and reports total, average, and percent of max.
Dog Raisin Toxicity Calculator
Estimates raisin dose (mg/kg and g/kg) and percent of a 10 g/kg reference level from dog weight.
Dog Size Calculator
Computes a BMI-like index, an approximate weight estimate from girth/length, and body surface area from weight.
Dog Water Intake Calculator
Estimates typical daily water needs as a range (44–66 mL/kg/day), reported in mL/day and L/day.
Doubling Time Calculator
Calculate how long it takes for a population to double.
Dry Matter Calculator
Compute dry matter and water weight from as-fed weight and dry matter percent.
Enzyme Kinetics Calculator
Calculate enzyme kinetics (Michaelis-Menten).
FCR Calculator
Calculate feed conversion ratio (FCR) and feed efficiency from feed intake and weight gain.
Fertilizer Calculator
Compute fertilizer product needed from area, target nutrient rate, and fertilizer grade percent.
Fish Oil Dosage for Cats Calculator
Free online Fish Oil Dosage for Cats Calculator. Quickly calculate and get instant results.
GDU Calculator
Calculate daily growing degree units (GDU) from max/min temperature and a base temperature.
Generation Time Calculator
Calculate bacterial generation time.
Goat Gestation Calculator
Free online Goat Gestation Calculator. Quickly calculate and get instant results.
Grain Bin Calculator
Estimate grain bin volume and grain mass from bin diameter, fill height, and bulk density.
Grain Conversion Calculator
Convert grains (gr) to mg, g, kg, oz, lb, and troy ounces using standard mass conversion factors.
Grass Seed Calculator
Estimate grass seed required from area, seeding rate (lb/1000 sq ft), and an optional extra percentage for waste.
Guinea Pig Age Calculator
Free online Guinea Pig Age Calculator. Quickly calculate and get instant results.
Guinea Pig Pregnancy Calculator
Free online Guinea Pig Pregnancy Calculator. Quickly calculate and get instant results.
Hamster Age Calculator
Free online Hamster Age Calculator. Quickly calculate and get instant results.
Hardy-Weinberg Calculator
Calculate Hardy-Weinberg genotype frequencies.
Horse Gestation Calculator
Free online Horse Gestation Calculator. Quickly calculate and get instant results.
Horse Weight Calculator
Estimate a horse’s body weight from heart girth and body length using a common tape formula: (girth²×length)/330.
How Big Will My Cat Get Calculator
Rule-of-thumb estimate of adult cat weight from current weight and age: adult ≈ current × (12/age in months).
Ligation Calculator
Compute insert mass (ng) for a ligation using DNA lengths and desired insert:vector molar ratio: insert = vector×(insert
Livestock Fence Calculator
Estimates fence perimeter, posts, and wire needed for a square or circular pasture with gates.
Llama Calculator
Estimates daily and total hay needs for llamas from weight, intake rate, hay dry matter, and days.
Log Reduction Calculator
Computes log10 reduction, reduction factor, and percent reduction from initial and final microbial counts.
MLVSS Calculator
Calculates MLSS, MLVSS, and volatile fraction from gravimetric masses and filtered sample volume.
Metacam Dosage Cat Calculator
Free online Metacam Dosage Cat Calculator. Quickly calculate and get instant results.
Mowing Cost Calculator
Estimates mowing time and total cost from area, mower width, speed, efficiency, labor, fuel, and maintenance.
Omega 3 for Dogs Calculator
Estimate daily EPA+DHA omega-3 dose for a dog and approximate capsules per day.
Osmolarity Calculator
Calculate osmolarity from molarity.
Pet Sitter Rates Calculator
Calculate pet sitting cost from per-visit rates, extra pets, surcharges, and tip.
Photosynthesis Rate Calculator
Calculate the rate of photosynthesis.
Plant Population Calculator
Free online Plant Population Calculator. Quickly calculate and get instant results.
Plants Calculator
Estimate how many plants fit in a rectangular area based on plant and row spacing.
Population Growth Calculator
Calculate exponential population growth.
Potting Soil Calculator
Compute potting soil volume for rectangular containers in cubic feet, yards, and liters.
Protein Concentration Calculator
Calculate protein concentration from mass and volume; outputs mg/mL (also g/L and µg/µL).
Protein Molecular Weight
Estimate protein molecular weight from amino acid count.
Protein Molecular Weight Calculator
Estimate protein molecular weight from amino-acid length using an average residue mass (default ~110 Da).
Punnett Square Calculator
Calculate offspring genotype probabilities.
QPCR Efficiency Calculator
Compute qPCR efficiency from standard-curve slope: E = 10^(-1/slope) − 1 (also shown as %).
Rabbit Cage Size Calculator
Free online Rabbit Cage Size Calculator. Quickly calculate and get instant results.
Rabbit Color Calculator
Single-locus rabbit coat trait (A dominant over a): compute offspring genotype and dominant/recessive phenotype probabil
Rabbit Gestation Calculator
Free online Rabbit Gestation Calculator. Quickly calculate and get instant results.
Rat Cage Calculator
Free online Rat Cage Calculator. Quickly calculate and get instant results.
Raw Dog Food Calculator
Free online Raw Dog Food Calculator. Quickly calculate and get instant results.
Sheep Gestation Calculator
Free online Sheep Gestation Calculator. Quickly calculate and get instant results.
Sod Calculator
Estimate sod needed from rectangular area, roll coverage, and waste/overage; returns total area and units to buy.
Swine Gestation Calculator
Free online Swine Gestation Calculator. Quickly calculate and get instant results.
The Cost of Owning a Dog Calculator
Estimate total and average cost of owning a dog using one-time costs plus monthly and annual recurring expenses.
Tramadol for Dogs Calculator
Estimates tramadol amount per dose and per day from dog weight, mg/kg dosing, and doses/day.
Tree Age Calculator
Free online Tree Age Calculator. Quickly calculate and get instant results.
Tree Diameter Calculator
Computes tree trunk diameter from measured circumference using D = C/π.
Tree Height Calculator
Estimates tree height using distance and angle to the top (tan method) plus observer eye height.
Tree Leaves Calculator
Estimates number of leaves from LAI, canopy ground area, and average leaf area.
Tree Spacing Calculator
Calculates planting density from row spacing and in-row spacing (trees per hectare and per acre).
Tree Value Calculator
Estimates tree value from DBH cross-sectional area, unit value, and species/condition/location ratings.
Trihybrid Cross Punnett Square Calculator
Computes gamete counts and Punnett square size for a trihybrid cross based on heterozygous loci counts.
Turtle Tank Calculator
Estimates minimum turtle tank volume using ~10 gallons per inch of shell length per turtle and chosen fill level.
Vapor Pressure Deficit Calculator
Calculates VPD (kPa) from air temperature and relative humidity using the Tetens saturation vapor pressure equation.
Vegetable Seed Calculator
Estimates seeds needed from total row length, in-row spacing, seeds per spot, and expected germination rate.
Vegetable Yield Calculator
Estimates plant density and total vegetable yield from spacing, area, per-plant yield, and survival rate.
Wastewater Calculator
Computes influent/effluent loads and removal efficiencies for BOD and TSS from flow and concentrations.
Water Potential Calculator
Calculates water potential (Ψw) as the sum of solute potential (Ψs) and pressure potential (Ψp).
Water Soluble Fertilizer Calculator
Finds grams of water-soluble fertilizer needed to achieve a target N ppm in a given solution volume.