Choose a science calculator by the quantity you need
This category brings together calculators for chemistry, physics, electrical calculations, optics, waves, fluid dynamics, gases, and radioactive decay. It includes broad multi-mode tools as well as focused calculators for one formula or relationship, so start with the quantity or equation you need rather than choosing by subject name alone.
For a broad starting point, use the Chemistry Calculator, Physics Calculator, or Electrical Calculator. For a more specific relationship, the Optics Calculator and Fluid Dynamics Calculator provide subject-specific modes.
Chemistry: use the broad tool or a focused formula calculator
The Chemistry Calculator provides modes for pH and pOH, molarity, dilution, molar mass, stoichiometry with limiting reagent, percent yield, solution preparation, Beer-Lambert law, and specific heat. Choose it when several related chemistry calculations may be useful in one interface.
Open a focused calculator when the formula is already clear:
- Molar Mass Calculator accepts chemical formulas including parentheses and hydrates.
- Stoichiometry Calculator works from a balanced chemical equation and calculates a reactant or product quantity using mole-ratio stoichiometry.
- Dilution Calculator solves one of stock concentration, stock volume, target concentration, or final volume when the other three are supplied.
- Beer-Lambert Law Calculator solves absorbance, concentration, path length, or molar or mass absorptivity.
Physics, energy, waves, and optics
The Physics Calculator brings together selectable relationships for force, acceleration, momentum, kinetic energy, potential energy, work, power, pressure, density, the ideal gas law, Ohm's law, voltage drop, battery runtime, wavelength, photon energy, and half-life. Use it when you want to move among several related quantities.
Focused tools are better when you already know the relationship: Force Calculator handles force, while separate calculators cover acceleration, momentum, kinetic energy, potential energy, power, pressure, work, and density. For wave and light relationships, the Wavelength Calculator solves wavelength, frequency, or wave speed; the Photon Energy Calculator calculates photon energy from wavelength or frequency; and the Optics Calculator covers thin-lens and mirror image distance, magnification, focal length, optical power, and wavelength-frequency relationships.
Electrical calculations: broad modes versus Ohm's law
The Electrical Calculator includes modes for watts, volts, amps, and resistance; resistor combinations; voltage drop; wire-size estimates; battery runtime; battery-bank sizing; and energy consumption. Choose it when the task may involve more than one electrical mode.
The Ohm's Law Calculator focuses on solving voltage, current, resistance, or power from two known values using Ohm's law and the power formula. For a specific supporting calculation, use the Voltage Drop Calculator for voltage drop across a wire run using length, current, conductor material, gauge, and supply voltage, or the Battery Runtime Calculator with battery capacity, load, voltage, and efficiency.
Gases, fluids, density, and decay
Use the Ideal Gas Law Calculator to solve pressure, volume, amount of gas, or temperature using PV = nRT. The Fluid Dynamics Calculator calculates Reynolds number, flow velocity, flow rate, and pressure drop for its documented pipe-flow relationships and identifies laminar, transitional, or turbulent flow.
The Density Calculator solves density, mass, or volume using density equal to mass divided by volume. The Half-Life Calculator calculates remaining quantity from an initial amount, half-life, and elapsed time.
A practical way to choose and check a result
- Choose the broad calculator if you need several related modes, or open a focused calculator when the quantity and formula are already known.
- Match your values to the input labels, units, formula, and assumptions shown on that tool page. Each calculator exposes its own controls and calculation model.
- Review the result against the supplied values and selected units before using it elsewhere. The displayed formula and inputs define what the result represents.
If you need to change direction, return to the Science Calculators listing or compare the broader Physics Calculator and Chemistry Calculator starting points.