All calculators
Every tool on CodingMarble Calculator. Pick a topic or search from the home page.
How this collection is organised
Eighty-two tools is too many to scroll through hoping to recognise the right one. They are grouped into five sections, and the grouping is by the kind of question you arrived with rather than by subject label. If you know roughly what you want to find out, one of the five descriptions below should match.
The five groups
| Group | Answers questions like | Typically used by |
|---|---|---|
| Finance | What will this cost, grow to, or leave me after tax? | Borrowers, investors, salaried employees, small businesses |
| Health | Where do I stand, and how much should I eat or train? | Anyone starting a fitness or diet change |
| Math | What is the answer, and how was it reached? | Students, teachers, anyone checking homework |
| Everyday | How long, how many, how much for this? | Households, timesheets, students with results in hand |
| Converters | Turn this into that, or give me a random one | Travellers, developers, teachers, game nights |
Who each group is really for
The finance section is the largest because money questions have the most variations. It covers both sides of a balance sheet: what you owe and what you are building. If you are deciding between two loan offers or working out whether a monthly investment will reach a target, start there.
The health section implements standard clinical and sports-science formulas. It is best used as a before-and-after reference — take a reading now, change something, read again in a month. A single number on a single day tells you very little.
The math section leans towards showing work rather than only producing an answer, which matters if you are trying to learn the method and not just finish the exercise. The everyday section is the smallest and the most frequently used: dates, hours, grades and bills. The converters section does no reasoning at all, it only translates between systems or produces something at random.
Where most people start
If you would rather jump straight in, these are the tools that get opened most. For loans and savings, the EMI calculator and the SIP calculator between them cover the two questions we are asked most often, with the PPF calculator close behind for long-term, fixed-return planning. On the pay side, the salary calculator explains the gap between CTC and the amount that reaches your account, and the GST calculator separates tax from base price for invoicing.
For health, the BMI calculator is the usual first stop and the calorie calculator the usual second. In maths, the percentage calculator answers more queries than everything else combined. Day to day, the age calculator gets used for forms and documents, and the unit converter for recipes, shipping and travel.
Things that apply to every tool here
- Nothing requires an account, and no figures you type are saved or sent to a server — the calculation runs in your browser.
- Every tool works on a phone, and the inputs are designed to be filled with a thumb rather than a mouse.
- Each page states the formula it uses, so you can check the method instead of trusting the output on faith.
- Results that depend on published rates or tax rules are estimates. Where an official body issues the real figure — a bank, an employer, a utility, a university or a clinician — that figure wins.
Use the search box on the home page if you know the name of what you want, or the filters below to narrow the full grid to one group.