Physics calculators
Mechanics, energy, and simple circuit relations.
Physics calculators on pancalc support introductory mechanics, electronics, fluids, optics, and acoustics problems with labeled fields and unit selectors. Each page ties worked examples to the configured relationship.
Use them for homework checks, lab estimates, and teaching how constants and unit conventions affect results. Align your inputs with the convention stated on the page before comparing to textbook answers.
Real experiments introduce measurement uncertainty and effects not modeled in simplified formulas — treat outputs as baselines.
11 calculators
Decibel Distance Attenuation Calculator
Estimate sound level at a new distance with the inverse-distance decibel relationship. Use the calculator above. Free browser tool.
Density & Water Weight Calculator
Compute density from mass and volume, plus weight of water at a given volume. Use the calculator above. Use the calculator above. Free browser tool.
Electrical Power Calculator
Compute electrical power in watts, kilowatts, and horsepower from voltage and current. Use the calculator above. Free browser tool.
Frequency, Period & Wavelength Calculator
Relate wave frequency, period, and wavelength for electromagnetic waves in vacuum. Use the calculator above. Free browser tool. Free browser tool.
Hooke's Law & Impulse-Momentum Calculator
Spring force F = kx and impulse J = mΔv for collision estimates. Use the calculator above. Use the calculator above. Free browser tool.
Kilograms to Newtons Calculator
Convert mass in kilograms to gravitational force in newtons using standard Earth gravity, or solve mass from force. Free browser tool.
Kinetic & Potential Energy Calculator
Calculate kinetic and gravitational potential energy from mass, speed, and height. Use the calculator above. Free browser tool. Free browser tool.
Ohm's Law Calculator
Solve voltage, current, or resistance from any two electrical values using Ohm’s law with practical circuit examples. Free browser tool.
Photon Energy & Wavelength Calculator
Convert photon wavelength, frequency, energy in electronvolts, and energy in joules. Use the calculator above. Free browser tool. Free browser tool.
Reynolds Number Fluid Flow Calculator
Find Reynolds number and flow regime from fluid density, velocity, diameter, and viscosity. Use the calculator above. Free browser tool.
Velocity, Acceleration & Time Calculator
Solve the constant-acceleration relationship between initial velocity, final velocity, acceleration, and elapsed time with examples.