Physics & Science
Free science calculators: density, mass, speed, molarity, molecular weight, half-life, BAC, and GFR. Precise tools for physics, chemistry, and health sciences.
Density Calculator
Calculate the density of any material knowing its mass and volume. Compare with common materials.
Mass Calculator
Calculate the mass of an object knowing its density and volume. Includes conversions to multiple units.
Weight on Planets Calculator
Discover how much you would weigh on different planets in our solar system. Compare the gravity of each celestial body.
Speed Calculator
Calculate speed knowing distance and time. Convert between m/s, km/h, mph, and knots.
Molarity Calculator
Calculate the molar concentration of a solution. Essential tool for laboratory chemistry.
Molecular Weight Calculator
Calculate the molecular weight of any chemical compound from its formula. Shows each element's contribution.
Half-Life Calculator
Calculate radioactive decay and the remaining amount of an isotope after a given time.
GFR Calculator (Glomerular Filtration Rate)
Calculate glomerular filtration rate to assess kidney function. Uses CKD-EPI or MDRD equations.
BAC Calculator (Blood Alcohol Content)
Estimate your blood alcohol level based on drinks consumed, weight, and time. Important: never drive if you've been drinking.
Body Surface Area Calculator
Calculate your body surface area (BSA) using different formulas. Used in medicine for medication dosing.
Physics
Density, mass and speed calculators.
Chemistry
Molarity and molecular weight calculators.
Health
GFR, BAC and BSA calculators.