Physics Calculators
27 calculators spanning mechanics, electromagnetism, atomic physics, thermodynamics, optics, relativity, and astrophysics — free, in your browser, no account required.
Page verified • Last updated: August 2026
NumCalcX has 27 physics calculators, many built around an animated or interactive diagram rather than just a formula output. Every tool below runs entirely client-side: nothing you type is sent to a server, and there's nothing to sign up for. Click any calculator to jump straight in.
Mechanics
Projectile Motion Calculator
Get range, max height, flight time, and impact velocity from a real animated trajectory — compare up to 5 shots side by side.
→Linear Motion Calculator
Get final position, velocity, and distance traveled from a real animated track, and solve two-car meeting problems.
→Free Fall Calculator
Get falling time, impact speed, max height, and impact kinetic energy, shown with a real animated drop.
→Pressure Calculator
Force-and-area or hydrostatic pressure, with a depth-vs-pressure chart.
→Pulley System Calculator
Find effort force for a multi-pulley block-and-tackle system, with a live diagram.
→Universal Gravitation Calculator
Find the gravitational force between two masses using Newton's law, with a force diagram.
→Mass vs Weight Calculator
Find your weight on any planet, with a chart comparing weight across the solar system.
→Work, Energy & Power Calculator
Work, kinetic/potential energy, or power — three modes with an energy comparison chart.
→Density Calculator
Solve for density, mass, or volume, and identify a material from a reference table.
→Electromagnetism & Atomic Physics
Ohm's Law Calculator
Solve V=IR, plus a series/parallel resistor circuit mode with a live diagram.
→Coulomb's Law Calculator
Electrostatic force between two charges, with an attraction/repulsion diagram.
→Magnetic Force Calculator
Force on a moving charge or current-carrying wire, with a vector diagram.
→Bohr Model Calculator
Electron orbit radius, energy levels, and spectral line wavelength, with an animated orbit.
→de Broglie Wavelength Calculator
Matter-wave wavelength for any moving particle or object, with a log-scale chart.
→Thermodynamics & Optics
Heat Transfer Calculator
Specific heat, latent heat, or conduction rate — three modes in one calculator.
→Lens & Mirror Calculator
Image distance and magnification for a lens or mirror, with a live ray diagram.
→Snell's Law Calculator
Angle of refraction and total internal reflection, with a ray diagram.
→Relativity & Astrophysics
Time Dilation Calculator
Time dilation from velocity (special relativity) or gravity (general relativity).
→Escape Velocity Calculator
Minimum speed to escape a planet's gravity, with a solar-system comparison chart.
→Kepler's Third Law Calculator
Orbital period, semi-major axis, or central mass, with a solar-system accuracy table.
→Lat/Long Distance Calculator
Calculate great-circle distance between two coordinates using the Haversine formula.
→Age on Other Planets Calculator
See your age in each planet's own year, based on its real orbital period.
→Schwarzschild Radius Calculator
Black hole event horizon radius for any mass, compared to the object's real size.
→Electronics
Op-Amp Gain Calculator
Calculate inverting or non-inverting op-amp voltage gain from feedback and input resistors.
→Logic Gate Calculator
Compute AND/OR/NOT/XOR/NAND/NOR/XNOR output and see the full truth table.
→Hamming Distance Calculator
Count the differing bit positions between two equal-length binary strings.
→PCB Trace Width Calculator
Estimate required copper trace width from current and temperature rise, using the IPC-2221 approximation.
→Frequently Asked Questions
Are these physics calculators free to use?
Yes. Every calculator on NumCalcX runs entirely in your browser — no sign-up, no account, and no data sent to a server.
What's the difference between the Free Fall and Projectile Motion calculators?
Free Fall models straight-down vertical drops only; Projectile Motion adds a launch angle and horizontal distance, like a thrown ball or a cannon shot.
Can I compare multiple physics scenarios at once?
Yes — the Projectile Motion Calculator lets you compare up to 5 shots with different speeds or angles side by side.