About PhysicsCalculator
A free tool for anyone who needs to put a number on the laws of nature.
PhysicsCalculator began with a simple frustration: most online calculators do one formula each. You find a page for kinetic energy, another for gravitational force, another for Coulomb's law — each with its own layout, its own quirks, and no way to handle a formula nobody thought to pre-build.
We wanted something different: a single calculator where you type any physics formula, drop in the physical constants you need, choose your units, and get an answer. Type it the way you would write it on paper, watch it render in proper mathematical notation, and let the tool handle the arithmetic and the unit conversions.
Who it's for
Students checking homework. Teachers preparing examples. Engineers running a quick sanity check. Hobbyists and the simply curious who want to know how hard the Moon pulls on the Earth, or how much energy is locked inside a gram of matter. No account, no download, no paywall.
How it works
You enter a formula such as F = G*M1*M2 / r^2. The calculator recognises G as the gravitational constant and fills its value automatically; for the remaining symbols it gives you input boxes and unit menus. It then evaluates the expression with a proper mathematics engine — respecting operator precedence, parentheses, powers and functions like sine, square root and logarithm — and shows the result across several unit systems.
Our commitment to accuracy
The physical constants built into the tool use widely accepted, CODATA-aligned values in SI units. That said, this is a free utility offered as-is: we encourage you to double-check any result that matters, especially for academic or professional work. If you spot an error, we genuinely want to hear about it.
The guides
Alongside the calculator we publish plain-language explanations of the formulas it computes. These aren't dry reference entries — they explain where each equation comes from, what its symbols mean, and how to interpret the answer, always with a worked example. Browse them on the Guides page.
Questions, suggestions or corrections? Please get in touch — we read everything.