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Most popular calculators
Age Difference Calculator
Use our age difference calculator to find the exact age gap between two people in years, months, and days. Fast, accurate, and easy to use online.
All-in-one Home Loan Calculator
Estimate your home loan amount, monthly payment, escrow costs and APR in one simple mortgage calculator. Enter price, down payment and rate to see clear USD results.
Atom Calculator
Use our Atom Calculator to relate atomic number, mass number, charge, protons, neutrons and electrons. Fast, accurate, ideal for chemistry and physics.
Bikini Calculator
Use our bikini calculator to find your body shape, waist–hip ratio and curve ratio, then get bikini style ideas that flatter your figure.
Body Shape Calculator
Use our free body shape calculator to find your body type from bust, waist, high hip and hip plus waist–hip ratio. Quick, visual and easy.
Confidence Interval Calculator
Free online confidence interval calculator for mean and proportion. Enter sample data to get SE, margin of error and 95% or custom CI in seconds.
Dihybrid Cross (Punnett Square) Calculator
Instantly build a 4×4 Punnett square for two traits, see genotype and phenotype probabilities with this interactive dihybrid cross calculator.
Dog Pregnancy (Due Date) Calculator
Use our dog pregnancy due date calculator to estimate whelping day from mating, ovulation, LH surge or diestrus. See safe whelping window, days remaining and progress.
Dog Size & Adult Weight Calculator
Estimate your dog’s adult weight in kg, lb, g or oz from age and current weight. Puppy size calculator with toy, small, medium, large & giant categories.
Elevation Grade Calculator
Free elevation grade calculator. Enter rise and run to get slope ratio, percent grade, and angle of elevation in degrees or radians. Fast, accurate, and easy to use.
Exponent Calculator
Quickly compute a = b^x with this free exponent calculator. Enter base and exponent to get instant, precise results.
Helium Balloons Calculator
Calculate how many helium balloons you need for any weight, plus lift per balloon and helium volume, with this easy online calculator.