PhysicsTool is a physics calculator website built and maintained by Manoj Meena, who holds an M.Sc. in Physics from the University of Delhi. Each calculator comes with the formula it uses, the meaning of every variable, and a worked explanation.
PhysicsTool at a Glance
| Website | PhysicsTool (physicstool.com) |
|---|---|
| Founder and developer | Manoj Meena |
| Qualification | M.Sc. in Physics, University of Delhi, 2020 |
| Launched | 2026 |
| What it offers | Physics calculators with the formula, variable definitions and a worked explanation |
| Topics covered | Mechanics, thermodynamics, electromagnetism, electronics, optics, fluid mechanics, astronomy, relativity and quantum physics |
| Units | SI and US customary |
Who Runs PhysicsTool
I’m Manoj Meena. I completed my M.Sc. in Physics at the University of Delhi in 2020, and I am based in [your city], India. PhysicsTool is a one-person project, so the name on the site is the person who answers for it.
I build each calculator, write the explanation under it, and fix the errors readers report. There is no anonymous staff and no guest author behind any calculator. If a result is wrong, the responsibility is mine.
Why I Built It
A physics answer is only useful when you can see where it came from. A bare number gives a student nothing to check a homework step against. It gives an engineer no way to judge whether the model fits the job.
So every calculator on PhysicsTool shows its equation, defines each symbol, and states its assumptions in plain words. A projectile calculator says when air resistance is ignored. A gas law calculator says when the gas is treated as ideal.
How Each Calculator Is Made
- The formula is taken from a published physics source, and that source is named and linked beside the calculator.
- Physical constants come from the CODATA values published by NIST, and unit definitions follow the SI Brochure from BIPM.
- The finished calculator is tested against worked examples with known answers before it is published.
- Unit conversions use exact definitions where they exist, such as 1 inch = 25.4 mm and 1 pound = 0.45359237 kg.
- Results are shown with their units, and rounding is applied only to the displayed value, never to the steps in between.
Sources Behind the Numbers
| Used for | Source |
|---|---|
| Fundamental constants such as the speed of light, the Planck constant, the Boltzmann constant and the elementary charge | NIST CODATA recommended values |
| SI units, prefixes and unit definitions | BIPM SI Brochure, 9th edition |
| Planet and Moon data such as mass, diameter and surface gravity | NASA NSSDCA Planetary Fact Sheet |
| Standard formulas and their derivations | University physics textbooks, including OpenStax University Physics |
Standard gravity is taken as 9.80665 m/s², the conventional value adopted by the General Conference on Weights and Measures. Any calculator that uses a local or planetary value states it next to the input.
What the Results Are For
The calculators are meant for study, teaching and first estimates. They use idealized models, so a real system with friction, losses or tolerances can behave differently from the number on screen.
Do not rely on a result alone for structural, electrical, medical or safety decisions. Work of that kind needs a qualified professional and the code or standard that applies where you are.
Corrections
If a calculator gives a result you believe is wrong, send me the calculator name, the inputs you entered and the answer you expected. I check each report against the source, and confirmed errors are fixed in both the tool and its explanation.
How the Site Is Funded
Every calculator is open to use with no account and no payment. The running costs are covered by display advertising, and advertisers have no influence on the formulas, sources or results.
Contact
Questions, corrections and suggestions for new calculators are welcome through the contact page. I read every message myself and answer error reports first.