Type any physics equation, drop in the constants, choose your units — and get the answer instantly. From Newton's gravity to photon energy, the universe resolves itself.
Not just arithmetic — a tool built around the way physical formulas actually work.
Enter an equation in plain text and watch it render in proper mathematical notation — fractions stacked, exponents raised, roots drawn.
Tap to insert G, c, ħ, ε₀, the mass of the Sun and dozens more. Every value pre-loaded in SI units.
Enter values in kilometres or miles, get answers in Joules, electronvolts or calories. Conversions happen automatically.
Clear, worked explanations of the formulas you'll use most — what each symbol means and how to compute it.
Why every mass pulls on every other, and how the inverse-square law sets the strength of that pull.
Read the guide →The energy of motion, where the factor of one-half comes from, and why speed matters more than mass.
Read the guide →How electric charges attract and repel — gravity's far stronger electrical cousin.
Read the guide →The most famous equation in physics, and what it really says about mass and energy.
Read the guide →No sign-up, no download. Open the calculator and start solving.