Science help for the lab and the revision desk
Science answers you can check for yourself
SolveCalcs pairs a free scientific calculator with eight physics, chemistry and study solvers that write out every substitution, so you learn the method and not just the number.
Open the calculator Browse all calculators
- No sign-up or download
- Every substitution shown
- Fine on a school laptop or phone
Free online scientific calculator
Trig, logs, roots, powers and brackets. Tap the keys or type: digits, + - * /, Enter for equals, Backspace to delete, Esc to clear.
Eight science calculators that show their working
Choose the one that matches your question. Each page explains the idea, gives a worked example and answers the usual questions.
Why SolveCalcs exists
Anyone who has done a physics practical knows the feeling: you have a page of readings, a formula you half remember and a calculator that gives you an answer with no hint of whether it is sensible. SolveCalcs was built for that moment. It is a small, independent project that aims to be the tab you keep open beside your lab book.
Every solver prints the formula it used, the numbers you gave it, and the units on the answer. When your own result differs, you can lay the two working lines side by side and find the slip: a gram that should have been a kilogram, a squared term you forgot, a sign flipped on the way down.
The scientific calculator above does the plain arithmetic. The specialist tools handle the parts of science where the same few formulas turn up again and again.
Which calculator should I use?
A quick map from the question in front of you to the tool that fits.
| If your question is about... | Start here | What you get |
|---|---|---|
| Circuits, batteries, bulbs and resistors | Ohm's law calculator | Volts, amps, ohms and watts from any two |
| Journeys, running pace, average speed | Speed, distance and time | Any one of the three, in your units |
| Falling objects, braking, projectiles in one direction | SUVAT calculator | All five motion quantities solved |
| Floating, sinking, material identification | Density calculator | Density, mass or volume with a float check |
| Formula mass, percent composition, grams to moles | Molar mass calculator | Element-by-element table |
| Making and diluting solutions | Molarity and dilution | C1V1 = C2V2 with solvent to add |
| Very big or very small numbers | Scientific notation converter | Scientific, engineering and E-notation |
| Planning for a course grade | Weighted grade calculator | Current grade and the final score needed |
Built for people who actually study
Students use SolveCalcs to check practical write-ups and problem sheets. Parents use it to see how a physics answer was reached so they can help without having to re-learn the topic. Teachers pull up a solver on the board to show how a substitution turns into a result, and then let the class try their own numbers.
Everything runs inside your browser, so nothing you type is stored on a server, and there is no account to create. That also means it keeps working on a patchy school network once the page has loaded.
How to use SolveCalcs in three steps
No account, no setup. Open a page and go.
Pick a tool
Use the scientific calculator for quick arithmetic or open a specialist solver for circuits, motion, chemistry or grades.
Enter what you know
Fill in the labelled boxes with their units. Anything left blank is what the tool will work out.
Read the working
Compare each line with your own method. Where the two differ is where to look again.
From the study guides
Plain-English explanations with worked examples. No jargon walls.
Frequently asked questions
Is SolveCalcs free?
Yes. Every calculator and guide is free, with no account, no download and no limit on how often you use them.
Does the scientific calculator use degrees or radians?
Degrees. The sin, cos and tan keys expect degrees and the inverse keys return degrees, which matches most school questions. For radians, multiply the angle by 180 and divide by pi first.
Can I use it on a school Chromebook or phone?
Yes. It runs in any modern browser, so a Chromebook, laptop, tablet or phone is enough.
Will it do my homework for me?
It will check your homework and show how an answer is reached. Exams are sat without a solver, so we would rather you understand the method.
What is the difference between a calc solver and an ordinary calculator?
An ordinary calculator returns a number. A calc solver, which is how many people describe tools like SolveCalcs, also writes out the formula and substitutions so you can follow the reasoning.
Do you store the numbers I enter?
No. Calculations happen in your browser and are not sent to us. See the privacy policy for the details, including how advertising cookies work.
I think an answer is wrong. What should I do?
Please tell us through the contact page with the calculator name and the exact numbers you entered. We check every report.