Science & engineering calculators
Free science and engineering calculators for speed, force, kinetic energy, Ohm's law, electrical power, pressure, density, pH, and more.
My Time Calculators provides 60 free science and engineering calculators for speed, force (F=ma), kinetic energy, Ohm's law, electrical power, pressure, density, wavelength, gravity, molar mass, pH, and torque — each with its physics formula.
All science calculators (60)
Speed / velocity
Distance, time, speed
Force (F=ma)
Newton's second law
Kinetic energy
½mv² calculator
Ohm's law
V, I, R calculator
Electrical power
Watts & efficiency
Pressure
Pa, bar, psi, atm
Density
Mass & volume
Wavelength
Frequency & wave speed
Gravitational force
Newton's law of gravity
Molar mass
Molecular weight
pH calculator
Acid / base strength
Torque
Force × distance
Acceleration
Change in velocity over time
Momentum
Mass × velocity
Work & energy
Force × distance
Ideal gas law
PV = nRT solver
Half-life
Radioactive decay
Resistor color code
4-band resistor value
Frequency & period
Frequency to period
Heat index
Feels-like temperature
Specific heat
Heat energy Q = mcΔT
Projectile motion
Range, height & flight time
Coulomb's law
Force between charges
Molarity
Solution concentration
Terminal velocity
Max falling speed
Escape velocity
Speed to leave a body
Lens / focal length
Thin lens equation
Doppler effect
Observed frequency shift
Efficiency
Output ÷ input × 100
Heat transfer rate
Thermal conduction
Pendulum period
Swing time of a pendulum
Gear ratio
Ratio & output speed
Potential energy
Gravitational PE = mgh
Wind chill
Feels-like cold temperature
Dew point
Condensation temperature
Collision energy
Energy & momentum in a crash
Free fall
Speed & distance falling
Power (work rate)
Power from work and time
Impulse & momentum
Force over time
Centripetal force
Force in circular motion
Hooke's law (spring)
Spring force & constant
Friction force
Friction from normal force
Mechanical advantage
Leverage of a machine
Capacitor energy
Charge & energy stored
Voltage divider
Output of a divider
Wire resistance
Resistance of a wire
Charge & current
Q = I × t relationship
Resistor power
Heat dissipated (P=I²R)
Moles to molecules
Moles, particles & mass
Dilution (C1V1=C2V2)
Dilute to a concentration
Combined gas law
New pressure, volume, temp
pH and pOH
Convert pH, pOH, H+, OH−
Percent yield
Reaction yield efficiency
Wave speed
v = frequency × wavelength
Snell's law
Refraction angle
Heat energy (Q=mcΔT)
Energy to change temperature
Thermal expansion
Expansion from heat
Weight on planets
Your weight across the solar system
Light travel time
Time for light to travel
Reynolds number
Laminar or turbulent flow
Why use our science calculators
Physics and chemistry run on formulas, and these calculators put them at your fingertips. Calculate the force on a moving object, the power in a circuit, the pH of a solution, or the molar mass of a compound — each tool applies the correct scientific equation and shows it clearly. They are ideal for students, lab work, engineering checks, and curiosity.
Scientific formulas are precise but easy to fumble under time pressure. These calculators remove arithmetic slips and unit confusion, letting you focus on the concept. Whether you are solving an Ohm's law circuit, computing kinetic energy, or converting pressure units for an engineering spec, you get a reliable answer with the governing equation in view.
How to choose the right calculator
- Choose the calculator for your field — mechanics, electricity, fluids, or chemistry.
- Enter known quantities in SI units (kilograms, metres, seconds) where indicated.
- Read the result with unit conversions and related values included.
- Check the displayed formula to confirm the relationship between your variables.
Frequently asked questions
What units do these science calculators use?
They primarily use SI units (kilograms, metres, seconds, Newtons, Pascals). Many results also include common alternate units like mph, PSI, or kJ.
Are they accurate enough for engineering?
They apply standard physics formulas with full precision and are excellent for checks and learning. For safety-critical engineering, always validate against certified tools and standards.
Can students use these for physics class?
Yes. Each tool shows the formula, making it a strong study and homework-checking aid.
Do the chemistry tools cover common compounds?
The molar mass calculator lets you build molecules from carbon, hydrogen, oxygen, and nitrogen atom counts, covering a wide range of common compounds.