Science calculators
Chemistry, physics, astronomy and weather: dilution, molarity, molar mass, electron configurations, projectile motion, power, sunrise and solstice times, wind chill, heat index and more.
Projectile motion calculatorRange, flight time, peak height and impact speed, with the path drawn.Dilution calculatorC1V1 = C2V2 for any value, stock and solvent volumes, and serial dilutions.Molarity calculatorMolarity, grams to weigh out or volume, from a molar mass or formula.Molar mass calculatorFormula to g/mol with each element's mass percent, hydrates included.Ka to pKa calculatorConvert Ka, pKa, Kb and pKb, and estimate the pH of a weak acid or base.Normality calculatorNormality and equivalent weight for acids, bases and redox reagents.Electron configurationFull and noble-gas configurations for all 118 elements, with NIST exceptions.Power calculatorWatts, kW and horsepower from work and time, force and speed, or a circuit.Inclined plane calculatorForces, friction, acceleration and mechanical advantage on a ramp.Sunrise and sunset calculatorSunrise, sunset, solar noon, day length and twilight for any place and date.Solstice and equinox calculatorExact times of the equinoxes and solstices for any year, in UTC and your zone.Half-life calculatorAmount left, time, starting amount or half-life, plus decay constant.Ohm's law calculatorVolts, amps, ohms and watts from any two of them.Speed, distance and timeSolve for speed, distance or time in any units.Density calculatorDensity, mass or volume from the other two, with common materials.Wind chill calculatorHow cold it feels in the wind, with frostbite times (NWS).Heat index calculatorHow hot it feels from temperature and humidity (NWS).Dew point calculatorDew point from temperature and humidity, or humidity from dew point.Percent error calculatorPercent error between measured and true values, and percent difference.