Aliquot is a free calculator suite for lab prep that shows every step of the arithmetic, flags the hazards, and works on a phone at the bench with no signal. If a student gets a weigh-out wrong, the substitution is on screen, so they can see where it went wrong and so can you.
Below are pages built for common practicals. Each is one link you can paste into your course management system. No accounts, no licence, nothing to install, and free for your students permanently.
Ready to use
The calculations a first-year practical actually asks for, in the order most courses meet them: weigh-outs, dilutions, percent solutions, stoichiometry, then acids, bases, and buffers.
First-year undergraduate · 12 calculators
Buffers, protein quantitation, and enzyme kinetics: the calculations a biochemistry practical repeats every week, with the temperature correction that catches most pH mistakes.
Second or third year undergraduate · 12 calculators
Master mixes, gels, and nucleic acid quantitation, plus the primer and assembly maths that students most often get wrong on their first attempt.
Second or third year undergraduate · 12 calculators
Calibration, statistics, and instrument maths: standard curves, outlier tests, significance, chromatography transfer, and the reference tables an analytical course keeps reaching for.
Second or third year undergraduate · 11 calculators
Percent solutions, isotonicity, dose-response, and the hazard reference a formulation practical needs, with every step shown for the report.
Undergraduate pharmacy · 10 calculators
The obvious questions
There is a paid tier for individuals who want exports, LaTeX, printable formula sheets, and higher AI limits. Every calculator, every shown derivation, and every hazard flag is free and always will be, because correctness is not something to charge for. Your students never have to pay to do the course.
No. There is no sign-up anywhere in the flow. Their saved work stays in their own browser and is never uploaded. Nothing is collected that would need a data-processing conversation with your institution.
Every calculation runs through a tested engine with over 900 automated tests behind it, and every result shows its substitution so it can be checked by eye. The worked examples and practice problems on the site are computed by that same engine rather than written by hand, so an answer key cannot drift from the maths.
No, and it says so on every page. It surfaces GHS hazard information as a prompt to check properly. The safety data sheet and your institution's protocols remain the authority.
To be told when it is wrong, and eventually to know whether it helped. If prep errors in submitted reports drop, that is the only number that matters here.
A fair question to ask a small project. The calculators work offline once loaded, the pages are static, and there is no server a student depends on to do arithmetic. If it were abandoned tomorrow, the tool in their browser would keep working.
Send the course name and the practical script. You get a page built for it, and there is nothing else to do.
Ask for a page for your course