Annealing Temperature Calculator
Calculate optimal PCR primer annealing temperature using nearest-neighbor thermodynamics, basic Tm formulas, and salt-adjusted methods for reliable amplification.
Free General Biology Calculators
20 toolsGeneral biology reference and utility calculators. Browse our free general biology tools below — no sign-up required.
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.