⚛ Science
Solve classic physics and chemistry problems: Ohm’s law, electrical power, resistors, density, molarity and dilution, motion, energy and radioactive half-life. Constants come from NIST CODATA and formulas from the free OpenStax textbooks, which makes these tools well suited to homework checks and lab work.
16 free science calculators
Density, Mass & Volume CalculatorSolve ρ = m/V for density, mass or volume in g/cm³, kg/m³ or lb/ft³, grams or pounds, mL, liters or gallons, plus specific gravity.Dilution Calculator (C1V1 = C2V2)Solve the dilution equation C1V1 = C2V2 for any one unknown: starting or final concentration or volume.Electrical Power CalculatorFind power in watts from voltage, current or resistance (P = VI, I²R, V²/R), plus energy used in kWh and running cost.Force Calculator (Newton's Second Law)Solve Newton's second law F = ma for net force, mass or acceleration, with force in newtons, pound-force and kilogram-force.Half-Life CalculatorWork out how much of a radioactive isotope or decaying substance remains after a given time from its half-life.Ideal Gas Law CalculatorSolve PV = nRT for pressure, volume, moles or temperature of an ideal gas, in kPa, atm, bar, liters, °C, K and more.Kinematics (SUVAT) CalculatorConstant-acceleration motion: from initial velocity, acceleration and time, find final velocity and displacement.Kinetic & Potential Energy CalculatorCalculate kinetic energy (½mv²) and gravitational potential energy (mgh) of an object in joules and other units.Molarity CalculatorFind the molar concentration (mol/L) of a solution from the mass of solute, its molar mass and the solution volume.Ohm's Law CalculatorSolve Ohm's law V = I × R for voltage, current or resistance, and get the power dissipated in watts.Percent Error CalculatorCompare a measured (experimental) value with the accepted (true) value: percent error, absolute error and relative error.pH CalculatorConvert between pH, pOH, hydronium [H₃O⁺] and hydroxide [OH⁻] concentration, and see whether a solution is acidic or basic.Projectile Motion CalculatorFind the range, maximum height and time of flight of a projectile from its launch speed, angle and height (no air resistance).Series & Parallel Resistor CalculatorCombine up to four resistors in series or parallel to get the equivalent resistance in ohms.Specific Heat CalculatorSolve q = mcΔT for heat energy, specific heat capacity, mass or final temperature. Water, metals and more.Wave Speed, Frequency & Wavelength CalculatorSolve v = fλ for wave speed, frequency or wavelength, and get the period. Works for sound, water and string waves.