Science & physics

Ohm's law, molar mass, dilution, free fall, energy, waves, pH, radioactivity: high-school and university physics and chemistry formulas, ready to use.

10 calculators
Ohm's law calculatorEnter any two of V, I, R and P and get the other two.Open →
Dilution calculator (C1V1 = C2V2)How much stock solution to take to get the concentration you want.Open →
Molar mass calculatorThe molar mass of a chemical formula (H2O, C6H12O6, Ca(OH)2…) with the mass composition.Open →
Free fall calculatorHow long an object takes to fall and how fast it hits the ground, without air resistance.Open →
Kinetic and potential energyThe energy of a moving or raised object, in joules, kilojoules and kWh.Open →
Resistor colour code calculatorThe value of a 4 or 5-band resistor from its colours.Open →
Wavelength, frequency and photon energyConvert frequency and wavelength (light, radio, sound) and find the photon energy.Open →
Half-life calculatorThe amount remaining after a given time, or the age of a sample (carbon-14 dating).Open →
pH calculatorGo from pH to H₃O⁺ concentration (and back), with pOH and whether the solution is acidic or basic.Open →
Your weight on other planetsHow much you'd "weigh" on the Moon, Mars, Jupiter and the rest of the Solar System.Open →