🔬 49 Calculators · 8 Topics · Updated April 2026
Science & Engineering Calculators
Free science calculators for physics, chemistry, and electrical engineering. Ohm's law, Newton's laws, ideal gas law, wave equations, and more.
Solve physics, chemistry, and engineering problems with calculators built on fundamental scientific laws. Enter known values and solve for unknowns using Ohm's law, Newton's second law, the ideal gas law, and more. Each calculator shows the formula and explains when to use it.
Most Popular
Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law (V = IR).
Force Calculator (F = ma)
Calculate force, mass, or acceleration using Newton's Second Law.
Speed Distance Time Calculator
Calculate speed, distance, or time using the formula distance = speed × time.
Ideal Gas Law Calculator (PV=nRT)
Calculate pressure, volume, temperature, or moles using the Ideal Gas Law.
Kinetic Energy Calculator
Calculate the kinetic energy of an object from its mass and velocity.
Half-Life Calculator
Calculate remaining amount of a substance after radioactive decay over time.
Browse by Topic
Physics
24 calculatorsSolve problems involving force (F=ma), speed/distance/time, density, kinetic energy (½mv²), and wave properties (v=fλ).
Density Calculator
Calculate density, mass, or volume using the formula density = mass / volume.
Force Calculator (F = ma)
Calculate force, mass, or acceleration using Newton's Second Law.
Kinetic Energy Calculator
Calculate the kinetic energy of an object from its mass and velocity.
Speed Distance Time Calculator
Calculate speed, distance, or time using the formula distance = speed × time.
Wavelength Calculator
Calculate the wavelength, frequency, or speed of a wave using the wave equation.
Force Calculator (F=ma)
Calculate force using Newton's Second Law.
Potential Energy Calculator
Calculate gravitational PE: PE = mgh.
Power Calculator
Calculate power: P = E/t.
Pressure Converter
Convert between PSI, bar, atm, kPa, mmHg.
Kinetic Energy Calculator
KE = ½mv².
Gravitational PE Calculator
U = mgh.
Work & Energy Calculator
W = F · d.
Free Fall Calculator
Time and velocity for a dropped object.
Projectile Motion Calculator
Range, apex, and flight time.
Pendulum Period Calculator
Period of a simple pendulum.
Spring Constant Calculator
Hooke's law k = F/x.
Doppler Shift Calculator
Observed frequency for a moving source.
Radioactive Half-Life Calculator
Remaining amount after n half-lives.
Thermal Expansion Calculator
Length change from temperature change.
Specific Heat Calculator
Q = mcΔT.
Sound Intensity (dB) Calculator
Decibel level from intensity.
Ideal Gas Law Calculator
PV = nRT, solve for pressure.
Wavelength ↔ Frequency Calculator
c = λf.
Rocket Delta-V Calculator
Tsiolkovsky rocket equation.
Nuclear
1 calculatorModel radioactive decay and calculate remaining substance after given half-life periods.
Chemistry
10 calculatorsCalculate molarity, pH, and solve ideal gas law problems (PV=nRT).
Ideal Gas Law Calculator (PV=nRT)
Calculate pressure, volume, temperature, or moles using the Ideal Gas Law.
Molarity Calculator
Calculate the molarity of a solution from moles of solute and volume of solution.
pH Calculator
Calculate pH from hydrogen ion concentration, or convert between pH and pOH.
Molar Mass Calculator
Calculate moles from mass and molar mass.
pH Calculator
Calculate pH from hydrogen ion concentration.
Dilution Calculator (C1V1=C2V2)
Solve dilution problems using C1V1 = C2V2.
Ideal Gas Law PV=nRT Calculator
Solve for any of P, V, n, or T.
Dilution (C1V1=C2V2) Calculator
Concentration after dilution.
Molarity Calculator
Solute moles per liter of solution.
pH from Concentration Calculator
pH from [H+] or [OH-].
Electrical
4 calculatorsCalculate voltage, current, resistance, and power using Ohm's law (V=IR). Determine correct wire gauge for circuits.
Acoustics
1 calculatorAstronomy
4 calculatorsOptics
2 calculatorsFrequently Asked Questions
What is Ohm's law?
Ohm's law states V = I × R, where V is voltage (volts), I is current (amps), and R is resistance (ohms). It's the fundamental relationship in all electrical circuits. From it you can also derive power: P = V × I. Enter any two known values and calculate the rest.
How do I use the ideal gas law?
PV = nRT relates pressure (P), volume (V), moles of gas (n), the gas constant (R = 0.08206 L·atm/mol·K), and temperature in Kelvin (T). Enter any four values to solve for the fifth. Remember to convert Celsius to Kelvin by adding 273.15.
What does half-life mean?
Half-life is the time it takes for half of a radioactive substance to decay. After one half-life, 50% remains. After two, 25%. After three, 12.5%. The formula is N(t) = N₀ × (1/2)^(t/t½). Carbon-14's half-life is 5,730 years, which is why it's used for archaeological dating.