221 science calculators that get the numbers right.
Physics, chemistry, biology, materials, weather and space, with the formulas shown. No signup, no paywalls.
Browse · 11 topics
Mechanics & Motion 34 calculators
- Angular Momentum CalculatorAngular momentum, L = Iω
- Angular Velocity CalculatorAngular velocity from RPM or speed
- Banked Curve CalculatorBanking angle or safe speed on a curve
- Centrifugal Force CalculatorCentrifugal force in circular motion
- Centripetal Force CalculatorCentripetal force and acceleration
- Drag Force CalculatorAerodynamic drag force
- Efficiency CalculatorEnergy efficiency: output over input
- Elastic Collision CalculatorVelocities after an elastic collision
- Energy & Work CalculatorKinetic and potential energy, work, power
- Escape Velocity CalculatorEscape velocity from any planet
- Force CalculatorForce, mass or acceleration (F = ma)
- Free Fall CalculatorFree fall time, speed and distance
- Friction CalculatorFriction force and coefficient
- Gravitational Force CalculatorGravity between two masses
- Heat Transfer CalculatorHeat energy and conduction rate
- Hooke's Law CalculatorSpring force with Hooke's law
- Impulse CalculatorImpulse and average force
- Inclined Plane CalculatorForces on an object on a ramp
- Kinematics CalculatorSolve SUVAT motion problems
- Kinetic Energy CalculatorKinetic energy, ½mv²
- Mechanical Advantage CalculatorMechanical advantage of simple machines
- Moment of Inertia CalculatorMoment of inertia of common shapes
- Momentum CalculatorLinear momentum, p = mv
- Newton's Laws CalculatorNewton's second law with friction
- Orbital Period CalculatorOrbital period of a satellite
- Pendulum CalculatorPeriod of a simple pendulum
- Potential Energy CalculatorGravitational and spring potential energy
- Power CalculatorMechanical or electrical power
- Projectile Motion CalculatorRange, height and flight time
- Rotational Kinetic Energy CalculatorRotational kinetic energy
- Simple Harmonic Motion CalculatorPeriod and motion of an oscillator
- Tension CalculatorTension in a rope or cable
- Torque CalculatorTorque from force and lever arm
- Velocity CalculatorVelocity, distance or time
Waves, Light & Sound 14 calculators
- Beat Frequency CalculatorBeat frequency of two tones
- Bragg's Law CalculatorX-ray diffraction with Bragg's law
- Brewster's Angle CalculatorBrewster's polarization angle
- Diffraction Grating CalculatorDiffraction grating angles
- Doppler Effect CalculatorDoppler shift in frequency
- Lens Equation CalculatorThin lens and mirror equation
- Lens Maker's Equation CalculatorFocal length from lens shape
- Magnification CalculatorMagnification of a lens system
- Malus's Law CalculatorLight through a polarizer
- Snell's Law CalculatorRefraction angles with Snell's law
- Sound Intensity CalculatorSound intensity and decibels
- Standing Wave CalculatorStanding wave harmonics
- Wave & Frequency CalculatorFrequency, wavelength and speed
- Wave Speed on a String CalculatorWave speed on a string
Fluids & Flow 16 calculators
- Bernoulli's Equation CalculatorSolve Bernoulli's equation
- Buoyancy CalculatorBuoyant force (Archimedes)
- Darcy-Weisbach CalculatorPipe friction head loss
- Density CalculatorDensity, mass or volume
- Froude Number CalculatorFroude number of a flow
- Hazen-Williams CalculatorWater pipe head loss (Hazen-Williams)
- Hydraulic Radius CalculatorHydraulic radius of a channel
- Hydrostatic Pressure CalculatorPressure at depth in a fluid
- Mach Number CalculatorMach number from speed
- Manometer CalculatorPressure from a manometer
- Orifice Flow CalculatorFlow rate through an orifice
- Pipe Velocity CalculatorFlow velocity in a pipe
- Poiseuille's Law CalculatorFlow rate by Poiseuille's law
- Reynolds Number CalculatorReynolds number: laminar or turbulent?
- Stokes' Law CalculatorSettling speed with Stokes' law
- Terminal Velocity CalculatorTerminal velocity of a falling object
Chemistry Basics 22 calculators
- Average Atomic Mass CalculatorAverage atomic mass from isotopes
- Avogadro's Number CalculatorMoles to particles and back
- Bond Order CalculatorBond order of a molecule
- Chemical Equation BalancerBalance any chemical equation
- Degree of Unsaturation CalculatorDegree of unsaturation
- Electrolysis CalculatorMass deposited by electrolysis
- Electron Configuration CalculatorElectron configuration of any element
- Electronegativity CalculatorElectronegativity difference and bond type
- Empirical Formula CalculatorEmpirical and molecular formula
- Isoelectric Point CalculatorIsoelectric point of an amino acid
- Lattice Energy CalculatorLattice energy of an ionic compound
- Limiting Reagent CalculatorFind the limiting reactant
- Mass Percent CalculatorMass percent in a compound or solution
- Moles CalculatorMoles, mass and molar mass
- Nernst Equation CalculatorCell potential with the Nernst equation
- Net Ionic Equation CalculatorNet ionic equation from a reaction
- Oxidation Number CalculatorOxidation numbers in a compound
- Percent Purity CalculatorPercent purity of a sample
- Percent Yield CalculatorPercent yield of a reaction
- Quantum Numbers CalculatorCheck a set of quantum numbers
- Stoichiometry CalculatorReactant and product amounts
- Theoretical Yield CalculatorTheoretical yield of a product
Acids, Bases & Solutions 19 calculators
- Alligation CalculatorMix two concentrations to a target
- Beer-Lambert Law CalculatorAbsorbance and concentration
- Boiling Point Elevation CalculatorBoiling point rise of a solution
- Buffer Capacity CalculatorBuffer capacity of a solution
- Freezing Point Depression CalculatorFreezing point drop of a solution
- Henderson-Hasselbalch CalculatorBuffer pH from pKa
- Ionic Strength CalculatorIonic strength of a solution
- Ksp CalculatorSolubility product (Ksp)
- Molality CalculatorMolality of a solution
- Mole Fraction CalculatorMole fraction of a mixture
- Normality CalculatorNormality of a solution
- Osmotic Pressure CalculatorOsmotic pressure of a solution
- Percent Ionization CalculatorPercent ionization of a weak acid
- pH CalculatorpH, pOH and ion concentration
- pKa CalculatorKa to pKa and buffer pH
- pOH CalculatorpOH from hydroxide or pH
- PPM to Molarity Calculatorppm to molarity and back
- Titration CalculatorUnknown concentration from a titration
- Water Hardness CalculatorConvert water hardness units
Gases & Reactions 17 calculators
- Arrhenius Equation CalculatorRate constant vs. temperature
- Boyle's Law CalculatorBoyle's law: pressure and volume
- Charles's Law CalculatorCharles's law: volume and temperature
- Clausius-Clapeyron CalculatorVapor pressure vs. temperature
- Combined Gas Law CalculatorThe combined gas law
- Enthalpy CalculatorReaction enthalpy from bond energies
- Entropy CalculatorEntropy change of a reaction
- Equilibrium Constant CalculatorEquilibrium constant Kc
- Gay-Lussac's Law CalculatorGay-Lussac's law: pressure and temperature
- Gibbs Free Energy CalculatorGibbs free energy and spontaneity
- Graham's Law CalculatorEffusion rates of two gases
- Half-Life CalculatorRadioactive decay and half-life
- Hess's Law CalculatorReaction enthalpy with Hess's law
- Ideal Gas Law CalculatorPV = nRT for any variable
- Partial Pressure CalculatorPartial pressures (Dalton's law)
- Raoult's Law CalculatorVapor pressure with Raoult's law
- Rate Law CalculatorReaction rate and order
Biology & Lab 27 calculators
- Allele Frequency CalculatorAllele frequencies from genotypes
- Animal Gestation CalculatorDue date for a pregnant animal
- Annealing Temperature CalculatorPCR annealing temperature
- Carrying Capacity CalculatorCarrying capacity of an environment
- Cell Density CalculatorCell density from a hemocytometer
- Dihybrid Cross CalculatorDihybrid Punnett square
- Dilution Factor CalculatorDilution factor and volumes
- DNA Concentration CalculatorDNA or RNA concentration from A260
- DNA Copy Number CalculatorDNA copy number from mass
- DNA Molecular Weight CalculatorMolecular weight of DNA or RNA
- DNA to mRNA ConverterTranscribe DNA and translate to protein
- Doubling Time CalculatorCell doubling time
- GC Content CalculatorGC content of a DNA sequence
- Hardy-Weinberg CalculatorHardy-Weinberg frequencies
- Ligation CalculatorInsert DNA for a ligation
- Log Reduction CalculatorLog and percent microbial reduction
- Michaelis-Menten CalculatorEnzyme rate (Michaelis-Menten)
- Microscope Field of View CalculatorMicroscope field of view
- Mutation Frequency CalculatorMutation frequency and rate
- Population Growth CalculatorExponential or logistic growth
- Primer Tm CalculatorPCR primer melting temperature
- Protein Concentration CalculatorProtein concentration from A280
- Protein Molecular Weight CalculatorProtein molecular weight
- Punnett Square CalculatorPunnett square for a cross
- qPCR Efficiency CalculatorqPCR efficiency from a standard curve
- Serial Dilution CalculatorPlan a serial dilution
- Trihybrid Cross CalculatorTrihybrid cross ratios
Electricity & Magnetism 13 calculators
- Capacitive Reactance CalculatorCapacitive reactance
- Capacitor CalculatorCapacitance, charge and stored energy
- Coulomb's Law CalculatorForce between two charges
- Electric Field CalculatorElectric field strength
- Electric Power CalculatorElectric power, P = VI
- Faraday's Law CalculatorInduced EMF in a coil
- Inductance CalculatorInductance of a solenoid
- LC Resonant Frequency CalculatorResonant frequency of an LC circuit
- Lorentz Force CalculatorForce on a moving charge
- Magnetic Flux CalculatorMagnetic flux through a surface
- Power Factor CalculatorPower factor and correction
- RC Time Constant CalculatorRC time constant
- RLC Circuit CalculatorImpedance and resonance of RLC
Heat & Weather 19 calculators
- Air Density CalculatorAir density from weather
- Carnot Efficiency CalculatorMaximum heat engine efficiency
- Coefficient of Performance CalculatorCOP of a heat pump or fridge
- Density Altitude CalculatorDensity altitude for pilots
- Dew Point CalculatorDew point from temperature and humidity
- Heat Index CalculatorHeat index (feels-like temperature)
- Heat Transfer Coefficient CalculatorConvective heat transfer coefficient
- Latent Heat CalculatorHeat for melting or boiling
- Mean Free Path CalculatorMean free path of gas molecules
- Newton's Law of Cooling CalculatorHow fast something cools
- Relative Humidity CalculatorRelative humidity
- RMS Velocity CalculatorRMS speed of gas molecules
- Specific Gas Constant CalculatorSpecific gas constant of a gas
- Specific Heat CalculatorHeat to change temperature (Q = mcΔT)
- Stefan-Boltzmann Law CalculatorRadiated power of a hot body
- Thermal Expansion CalculatorHow much a material expands
- Wet Bulb Temperature CalculatorWet-bulb temperature
- Wien's Law CalculatorPeak wavelength of blackbody light
- Wind Chill CalculatorWind chill (feels-like temperature)
Materials & Stress 18 calculators
- Brinell Hardness CalculatorBrinell hardness number
- Bulk Modulus CalculatorBulk modulus of a material
- Elongation CalculatorElongation under load
- Factor of Safety CalculatorFactor of safety
- Hoop Stress CalculatorHoop stress in a pressure vessel
- Mohr's Circle CalculatorPrincipal stresses with Mohr's circle
- Natural Frequency CalculatorNatural frequency of a system
- Poisson's Ratio CalculatorPoisson's ratio
- Section Modulus CalculatorSection modulus of a beam
- Shear Modulus CalculatorShear modulus
- Shear Stress CalculatorShear stress, τ = F/A
- Specific Gravity CalculatorSpecific gravity of a substance
- Strain CalculatorStrain from change in length
- Stress CalculatorStress from force and area
- Thermal Stress CalculatorThermal stress in a constrained part
- Torsion CalculatorShear stress and twist in a shaft
- Von Mises Stress CalculatorVon Mises equivalent stress
- Young's Modulus CalculatorYoung's modulus
Space & Modern Physics 22 calculators
- Binding Energy CalculatorNuclear binding energy and mass defect
- Bohr Model CalculatorBohr model energy levels
- Compton Scattering CalculatorCompton wavelength shift
- de Broglie Wavelength Calculatorde Broglie wavelength of a particle
- E=mc² CalculatorE = mc²
- Heisenberg Uncertainty CalculatorHeisenberg uncertainty limits
- Hohmann Transfer CalculatorDelta-v for a Hohmann transfer
- Length Contraction CalculatorRelativistic length contraction
- Light Year CalculatorLight years, AU, parsecs and km
- Luminosity CalculatorA star's luminosity
- Orbital Velocity CalculatorOrbital velocity at any altitude
- Parallax CalculatorDistance to a star from parallax
- Photoelectric Effect CalculatorPhotoelectric effect energies
- Photon Energy CalculatorEnergy of a photon
- Redshift CalculatorRedshift and recession speed
- Relativistic Kinetic Energy CalculatorKinetic energy near light speed
- Rocket Equation CalculatorRocket delta-v (Tsiolkovsky equation)
- Rydberg Equation CalculatorHydrogen spectral line wavelengths
- Schwarzschild Radius CalculatorEvent horizon of a black hole
- Specific Impulse CalculatorRocket engine specific impulse
- Thrust-to-Weight Ratio CalculatorThrust-to-weight ratio
- Time Dilation CalculatorRelativistic time dilation