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Most popular calculators
Avogadro’s number calculator
Calculate moles, particles, mass and molar mass using Avogadro’s constant. Real-time results with unit selectors and PDF export; mobile-friendly.
BC to AD Year Difference Calculator
Use our BC to AD Year Difference Calculator to find the years between BC/BCE and AD/CE dates using the no-year-0 formula.
Beam Deflection Calculator
Free beam deflection calculator for simply supported & cantilever beams. Point, uniform & triangular loads; set E/I or EI; instant results with steps & PDF.
Body Shape Calculator
Body Shape Calculator helps you identify your body type from key measurements and understand which shape category fits you best.
Face Shape Calculator
Use our Face Shape Calculator to estimate your likely face shape from forehead, cheekbone, jawline, and face length measurements plus chin shape.
Grams To Calories Calculator
Use our Grams to Calories Calculator to estimate calories from grams of carbs, protein, fat, and alcohol using standard macro calorie factors.
Helium Balloons Calculator
Use our Helium Balloons Calculator to estimate lift per balloon, total helium volume, and how many helium balloons you need to lift a given weight.
IQ PERCENTILE CALCULATOR
Use our IQ Percentile Calculator to convert an IQ score into percentile rank, percent above, and percent below using SD 15 or SD 16 normal-distribution scales.
mg to mL Calculator
Use our mg to mL Calculator to convert weight and volume using liquid density, preset liquids, or medication concentration in mg/mL or mg/5 mL.
Punnett Square Calculator
Punnett Square Calculator to predict genotype and phenotype ratios for monohybrid and dihybrid genetic crosses.
RPM Calculator
Use our RPM Calculator to find engine RPM from speed or vehicle speed from RPM using overall gear ratio and tire diameter, plus wheel RPM and tire circumference.
Waist-to-Height Ratio (WHtR) Calculator
Waist-to-Height Ratio (WHtR) Calculator measures WHtR, check risk category, and compare your waist with the half-height target.