For teachers and lecturers
Calculators built to be shown, not just used
260+ free tools for maths, physics, engineering and financial literacy — most with an animated diagram that responds to what students type.
No accounts, no student data collected, nothing to install, and free to embed in your school's own website. Use them however is useful.
Live on the whiteboard
Change an input and the diagram redraws. Showing a class what happens to a projectile as the angle passes 45°, or to sine as the radius sweeps past 90°, lands better than a static textbook figure.
Checking working, not replacing it
Students do the method by hand, then verify. Every calculator shows the formula and the intermediate steps, so a wrong answer becomes a diagnosable mistake rather than a mystery.
Any device, no accounts
Works on a school Chromebook, a phone or an interactive whiteboard. No login, no email address, nothing for a student to sign up to and nothing for you to administer.
Units and currency that match your country
Metric or imperial throughout, and 38 currencies in the financial tools — so a lesson in Kigali, Lagos or Manchester uses the right units rather than converting from US examples.
By subject
Maths
Trigonometry on a live unit circle, prime factor trees, probability grids, standard deviation, quadratics and geometry.
Physics & Engineering
Projectile motion with a live trajectory, Ohm’s law with current flow, resistor colour bands, free fall, momentum and kinetic energy.
Financial literacy
Compound interest, loans and mortgages with amortization schedules — useful for PSHE, business studies and life-skills lessons.
Put a calculator on your school website
Every calculator can be embedded free. Open any calculator, scroll to Embed this calculator on your site, and copy the code. It resizes itself and keeps working when we improve the tool. All we ask is that you keep the small credit link underneath.
Linking from a resources page
If you keep a list of useful links for students, we would be glad to be on it. Here is something ready to paste.
Printable classroom handouts
The flyer folds into six panels and covers every subject — print double-sided on A4 and fold twice. The single-subject sheets are one page each, with a QR code to every calculator and a suggestion for using it in a lesson.
Printable handouts are being prepared. In the meantime every calculator page prints cleanly from the browser — use the Print button above the results.
A note on accuracy
Every formula is stated on the page so students can see the method rather than trusting a black box, and each calculator says where its assumptions break down — which rounding convention applies, when a rule of thumb stops holding, and when a professional should be consulted. If you find an error or something taught differently in your curriculum, please tell us at contact@calcfusionhub.com — corrections from teachers are the most useful feedback we get.