Allele Frequency Calculator
Calculate allele and genotype frequencies using Hardy-Weinberg equilibrium. Supports observed counts, chi-square testing, and population genetics analysis.
Free Biology Calculators
89 toolsExplore life science with calculators for genetics, lab work, animal care, ecology, and garden planning. The collection is built for students, researchers, veterinarians, and growers.
Genetics
8 calculatorsPunnett square, Hardy-Weinberg, allele frequency, and inheritance calculators.
DNA Concentration Calculator
Calculate DNA concentration from absorbance (A260), nanodrop data, molar conversions, and purity ratios. Covers dsDNA, ssDNA, RNA, and oligonucleotides.
DNA Copy Number Calculator
Calculate DNA copy number from mass and length. Convert ng to copies for qPCR standards, plasmid dilutions, and NGS library quantification.
DNA to mRNA Transcription Calculator
Transcribe a DNA sequence to mRNA, find codons, translate to amino acids, and calculate molecular properties. Supports template and coding strand input.
Protein Concentration Calculator
Calculate protein concentration using Bradford, BCA, A280 absorbance, and Beer-Lambert methods. Includes BSA standard curve fitting and dilution planning.
Protein Molecular Weight Calculator
Calculate protein molecular weight from amino acid sequence or composition. Covers residue weights, pI estimation, extinction coefficient, and charge at pH.
Punnett Square Calculator
Generate Punnett squares for monohybrid (2×2) and dihybrid (4×4) crosses. Color-coded grids, phenotype ratio bars, genotype breakdown tables, inheritance pattern detection, and common cross presets.
qPCR Efficiency Calculator
Calculate qPCR amplification efficiency from standard curve slope. Includes R², dynamic range, LOD estimation, and ΔΔCt fold-change analysis.
Ecology
2 calculatorsPopulation growth, carrying capacity, biodiversity, and ecosystem calculators.
Animal Mortality Rate Calculator
Calculate mortality rate, survival rate, and life expectancy for wildlife populations. Includes life table analysis, survivorship curves, and population projections.
Cell Doubling Time Calculator
Calculate cell doubling time, growth rate, and generation time from cell counts. Supports exponential growth modeling, passage planning, and seeding calculations.
Lab Science
1 calculatorDilution, concentration, cell counting, and PCR calculators.
Cell Dilution Calculator
Calculate cell dilution volumes using C1V1=C2V2. Supports serial dilutions, hemocytometer counting, seeding density planning, and viability-corrected concentrations.
Animals
39 calculatorsPet medication dosing, gestation, and animal biology calculators.
Benadryl Dosage for Dogs Calculator
Calculate the safe Benadryl (diphenhydramine) dosage for your dog based on weight, formulation type, and frequency. Includes safety warnings and vet guidance.
Bird Age Calculator
Convert your bird's age to human years based on species, size, and lifespan data. Covers parrots, finches, canaries, and more with life stage mapping.
Cat Benadryl Dosage Calculator
Calculate safe Benadryl (diphenhydramine) dosage for cats by weight and formulation. Includes feline-specific warnings, side effects, and vet guidance.
Cat BMI Calculator
Calculate your cat's Body Mass Index and Body Condition Score. Assess feline obesity risk with breed-adjusted weight ranges and health recommendations.
Cat Chocolate Toxicity Calculator
Calculate chocolate toxicity risk for cats based on weight, chocolate type, and amount ingested. Includes theobromine levels, symptom timeline, and emergency guidance.
Cat Pregnancy Calculator
Calculate your cat's due date, track pregnancy milestones, and get stage-by-stage care guidance. Covers the full 63-67 day feline gestation period.
Cat Quality of Life Calculator
Assess your cat's quality of life using the veterinary HHHHHMM scale. Evaluate hurt, hunger, hydration, hygiene, happiness, mobility, and more good than bad days.
Catculator — Cat Age in Human Years
Convert your cat's age to human years with breed-adjusted calculations. Covers indoor vs outdoor cats, life stages, and health milestones.
Cattle Per Acre Calculator
Calculate stocking rate for cattle pastures based on forage type, rainfall, and herd size. Includes AUM, carrying capacity, and rotational grazing guidance.
Cephalexin for Cats Dosage Calculator
Calculate cephalexin (Keflex) dosage for cats by weight and infection type. Covers oral suspension and capsule forms with feline safety guidelines.
Cephalexin for Dogs Dosage Calculator
Calculate cephalexin dosage for dogs by weight, infection type, and formulation. Includes canine dosing charts, treatment protocols, and safety information.
Cost of Owning a Dog Calculator
Estimate the lifetime cost of dog ownership including food, vet care, grooming, insurance, training, and supplies by breed size and lifestyle.
Cow Gestation Calculator
Calculate cow due dates and track pregnancy stages through the 283-day bovine gestation period. Includes breed-specific timelines, milestones, and calving preparation.
Dog BMI & Body Condition Calculator
Assess your dog's body condition score (BCS), ideal weight range, and calorie needs by breed. Includes 9-point BCS scale, breed weight references, and diet recommendations.
Dog Chocolate Toxicity Calculator
Calculate the toxicity risk of chocolate ingestion in dogs based on weight, chocolate type, and amount consumed. Includes theobromine dose thresholds and emergency guidance.
Dog Heat Cycle Calculator
Track your female dog's estrus (heat) cycle stages, predict the next heat, and identify optimal breeding windows. Includes cycle timeline, signs, and management tips.
Dog Life Expectancy Calculator
Estimate your dog's life expectancy based on breed, size, weight, and lifestyle factors. Includes breed-specific data, health risk factors, and longevity optimization tips.
Dog Metacam (Meloxicam) Dosage Calculator
Calculate meloxicam (Metacam) dosage for dogs by weight. Includes initial and maintenance dose, oral suspension measurement, and safety guidelines for canine NSAID therapy.
Dog Onion Toxicity Calculator
Calculate onion and allium toxicity risk in dogs. Covers garlic, leeks, chives, and shallots with hemolytic anemia thresholds, symptom timelines, and emergency guidance.
Dog Pregnancy Calculator
Track canine pregnancy stages and calculate whelping dates. Covers the 63-day gestation, week-by-week milestones, nutrition needs, and whelping preparation for dog breeders.
Dog Quality of Life Calculator
Assess your dog's quality of life using the HHHHHMM veterinary scale. Evaluate hurt, hunger, hydration, hygiene, happiness, mobility, and more good days than bad.
Dog Raisin & Grape Toxicity Calculator
Calculate grape and raisin toxicity risk in dogs. Assess kidney damage potential by weight and amount consumed. Includes symptom timeline and emergency action guidelines.
Fish Oil Dosage for Cats Calculator
Calculate proper omega-3 fish oil dosage for cats by weight and health condition. Covers EPA/DHA ratios, supplement forms, and veterinary dosing guidelines.
Goat Gestation Calculator
Calculate goat due dates and track pregnancy milestones across dairy, meat, and miniature breeds. Covers 145-155 day gestation with breed-specific timelines.
Guinea Pig Age Calculator
Convert guinea pig age to human years and learn about their life stages. Covers lifespan by breed, aging milestones, and senior guinea pig care.
Guinea Pig Pregnancy Calculator
Track guinea pig (cavy) pregnancy with due date prediction and week-by-week milestones. Covers the 59-72 day gestation, pup development, nutrition, and breeding safety.
Hamster Age Calculator
Convert hamster age to human years and understand life stages. Covers lifespan by species, aging milestones, and senior hamster care guidelines.
Horse Gestation Calculator
Calculate equine foaling dates and track pregnancy milestones by breed. Covers the 320-370 day gestation with veterinary checkpoints and foaling preparation.
Horse Weight Calculator
Estimate horse weight using heart girth and body length measurements. Covers weight tapes, condition scoring, and ideal weight ranges by breed.
How Big Will My Cat Get Calculator
Predict your cat's adult size using current age, weight, breed, and growth patterns. Covers growth curves, breed weight ranges, and kitten development milestones.
Metacam Dosage for Cats Calculator
Calculate meloxicam (Metacam) dosing for cats. Covers feline-specific safety protocols, chronic pain management, CKD considerations, and monitoring schedules.
Omega-3 for Dogs Calculator
Calculate EPA/DHA fish oil dosing for dogs by weight and health condition. Covers skin, joint, heart, kidney, and cognitive support with product comparisons.
Rabbit Cage Size Calculator
Calculate minimum enclosure size for rabbits by breed, number of rabbits, and housing type. Covers indoor cages, hutches, x-pens, and free-roam setups.
Rabbit Color Genetics Calculator
Predict rabbit kit coat colors from parent genotypes. Covers A, B, C, D, E loci, dilute, extension, and common breed color patterns.
Rabbit Gestation Calculator
Calculate rabbit due dates with breed-specific gestation periods, kindle preparation timelines, and development milestones from breeding to weaning.
Raw Dog Food Calculator
Calculate raw feeding portions for dogs by weight, age, and activity level. Covers BARF and PMR ratios with protein/bone/organ/vegetable breakdowns.
Sheep Gestation Calculator
Calculate sheep lambing dates by breed with 145-155 day gestation periods, flushing schedules, shearing timing, and lamb development milestones.
Swine Gestation Calculator
Calculate pig farrowing dates by breed with 112-120 day gestation periods, farrowing crate timing, neonatal care milestones, and weaning schedules.
Tramadol Dosage for Dogs Calculator
Calculate tramadol pain medication doses for dogs by weight, condition severity, and formulation with safety limits, interaction warnings, and tapering schedules.
Gardening
19 calculatorsSeed spacing, soil volume, compost ratio, and garden planning calculators.
Bacteria Growth Calculator
Calculate bacterial population growth using exponential and logistic models. Estimate doubling time, generation count, and colony size over time.
Basal Area Calculator
Calculate tree basal area from diameter at breast height (DBH). Estimate stand density, basal area per acre, and stocking levels for forest management.
Bulb Spacing Calculator
Calculate optimal planting spacing and quantity for flower bulbs. Covers tulips, daffodils, crocuses, hyacinths, and more with depth and density guides.
CO₂ Grow Room Calculator
Calculate CO₂ supplementation needs for indoor grow rooms. Determine tank size, flow rate, and cost to reach optimal PPM levels for plant growth.
Compost Calculator
Calculate compost pile volume, carbon-to-nitrogen ratio, and material quantities. Plan optimal green/brown mixes for fast, efficient composting.
Corn Yield Calculator
Estimate corn yield per acre using ear counts, kernel rows, and kernel weight. Calculate bushels per acre with the yield component method.
Daily Light Integral (DLI) Calculator
Calculate DLI from PPFD and photoperiod. Determine if your grow lights provide enough light for optimal plant growth with PAR-based analysis.
Fertilizer Calculator
Calculate fertilizer application rates from NPK ratios. Determine how much product to apply per area to meet soil test recommendations for any crop.
Grass Seed Calculator
Calculate grass seed quantity for new lawns and overseeding. Coverage rates for Kentucky bluegrass, fescue, bermuda, zoysia, and more by area.
Plants per Area Calculator
Calculate how many plants fit in a garden bed, row, or field. Covers grid, staggered, and row spacing for vegetables, flowers, and ground covers.
Potting Soil Calculator
Calculate potting soil volume for containers, raised beds, and planters. Covers standard pots, grow bags, window boxes, and custom shapes.
Soil Amendment Calculator
Calculate soil amendments needed for pH correction and nutrient optimization. Covers lime, sulfur, gypsum, compost, and fertilizer rates by soil type.
Tree Age Calculator
Estimate tree age from diameter, circumference, or species growth factor. Covers 40+ North American tree species with USDA growth factors.
Tree Diameter Calculator
Calculate tree diameter from circumference, or estimate diameter and basal area at breast height (DBH). Covers single and multi-stem trees.
Tree Height Calculator
Estimate tree height using shadow method, stick method, or clinometer angle. Covers multiple measurement techniques with step-by-step instructions.
Tree Leaf Area Calculator
Estimate total leaf area and leaf count for trees. Calculate canopy density, LAI, and biomass from crown dimensions and species data.
Tree Value Calculator
Estimate tree value using the Council of Tree and Landscape Appraisers (CTLA) trunk formula method. Covers species, condition, and location factors.
Vegetable Seed Calculator
Calculate vegetable seed quantity for your garden. Covers direct sowing, transplants, succession planting, and 30+ common vegetables.
Water-Soluble Fertilizer Calculator
Calculate mixing ratios for liquid fertilizer concentrate. Covers PPM targets, dilution rates, stock solutions, and injector ratios.
General Biology
20 calculatorsGeneral biology reference and utility calculators.
Annealing Temperature Calculator
Calculate optimal PCR primer annealing temperature using nearest-neighbor thermodynamics, basic Tm formulas, and salt-adjusted methods for reliable amplification.
Cricket Chirp Thermometer Calculator
Estimate outdoor temperature from cricket chirp rates using Dolbear's Law. Convert chirps per minute to Fahrenheit and Celsius with species-specific adjustments.
Dry Matter Calculator
Calculate dry matter intake, percentage, and feed conversion for livestock and pet nutrition. Compare feeds on dry matter basis for accurate diet formulation.
Feed Conversion Ratio Calculator
Calculate feed conversion ratio (FCR) for poultry, swine, cattle, and aquaculture. Track feed efficiency, cost per gain, and compare across species and production stages.
Grain Bin Calculator
Calculate grain bin capacity in bushels for round and flat-bottom bins. Estimate stored volume, peak grain height, and weight for corn, wheat, soybeans, and more.
Grain Conversion Calculator
Convert between bushels, pounds, metric tons, and hundredweight for corn, wheat, soybeans, and 10+ grain types. Includes price and volume unit conversions.
Growing Degree Units Calculator
Calculate growing degree days (GDD/GDU) for corn, wheat, and other crops. Track heat accumulation, predict crop staging, and plan planting dates.
Ligation Calculator
Calculate optimal insert-to-vector molar ratios for DNA ligation reactions. Determine DNA mass, moles, and volumes for cloning with T4 DNA ligase.
Livestock Fence Calculator
Calculate fencing materials, posts, wire, and cost for livestock enclosures. Supports barbed wire, electric, woven wire, and board fence for cattle, horses, and sheep.
Llama Calculator
Calculate llama weight, feed requirements, body condition scoring, stocking rate, and shearing yield. Complete management tool for llama and alpaca owners.
Log Reduction Calculator
Calculate microbial log reduction, percent kill, and surviving organisms for sterilization, disinfection, water treatment, and food safety applications.
MLVSS Calculator
Calculate mixed liquor volatile suspended solids, SRT, F/M ratio, and sludge age for activated sludge wastewater treatment process optimization.
Mowing Cost Calculator
Calculate lawn mowing time, fuel usage, and cost for residential and commercial properties. Compares walk-behind, riding, and zero-turn mowers with labor estimates.
Mulch Calculator
Calculate mulch volume in cubic yards, number of bags, and cost for garden beds, landscaping, and tree rings. Supports multiple mulch types and bed shapes.
Pet Sitter Rates Calculator
Calculate pet sitting rates for dogs, cats, and exotic pets. Estimate daily, overnight, and boarding costs with regional adjustments and service add-ons.
Rat Cage Calculator
Calculate minimum cage size for pet rats based on number of rats. Includes cage dimensions, bar spacing, shelf area, and recommended cage models.
Vapor Pressure Deficit Calculator
Calculate VPD from temperature and humidity for greenhouse, indoor garden, and cannabis growing. Includes crop-specific optimal ranges and leaf temperature correction.
Vegetable Yield Calculator
Estimate vegetable garden yield by crop, area, and growing conditions. Plan harvest quantities for family gardens, market farms, and community plots.
Wastewater Treatment Calculator
Calculate wastewater treatment parameters including BOD removal, hydraulic retention time, sludge age, and activated sludge design for treatment plants.
Water Potential Calculator
Calculate plant water potential from solute concentration, pressure, and matric components. Predict osmotic potential using van't Hoff equation for biology students.