Speed, Distance and Time Calculator
Find speed, distance or travel time from the other two values, with common units for each.
Coming soon
Science & Engineering Calculators
Science and engineering calculators apply standard formulas from physics, chemistry, biology, astronomy, earth science and engineering to the values you enter. Sections follow the fields taught in school and university, from mechanics and electronics to chemistry and materials. Keep units consistent, because many formulas expect metric SI units such as meters, kilograms and seconds.
Subcategories
- Mechanics (0 tools)
- Waves, Optics & Sound (0 tools)
- Electronics (0 tools)
- Heat & Fluids (0 tools)
- Quantum & Nuclear (0 tools)
- Astronomy (0 tools)
- Chemistry (0 tools)
- Biology (0 tools)
- Earth & Environment (0 tools)
- Engineering & Materials (0 tools)
Tools
Ohm's Law Calculator
Find voltage, current, resistance or power from any two known values using Ohm's law.
Coming soon
Molar Mass Calculator
Calculate the molar mass of a chemical formula, such as H2SO4 or Ca(OH)2, from standard atomic weights.
Coming soon
Frequently asked questions
What does Ohm's law say?
Ohm's law says that the voltage across a resistor equals the current through it multiplied by its resistance, written V = I × R. If you know any two of voltage, current and resistance, you can find the third: 2 amps through a 6-ohm resistor needs 12 volts.
How is molar mass calculated?
Add up the atomic masses of every atom in the chemical formula; the total is the molar mass in grams per mole. Water, H2O, has two hydrogen atoms at about 1.008 g/mol each and one oxygen atom at about 15.999 g/mol, for a total of about 18.015 g/mol.