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10 tools. Search it, or work down the topic.

Every one is free, needs no account, and computes in your browser — nothing you type reaches us. Each shows the formula and the intermediate quantities, because a number with no working is worth almost nothing in a marked script.

269 more are being added at ten a day. Everything listed here is finished and working — nothing below is a placeholder.

Filter by input pattern

Academic Planning

5

Grades, credits and the arithmetic of academic standing. These are the most used tools in the library and the ones students most often need mid-term rather than at the end.

All 5 in Academic Planning →

Mathematics

2

The general-purpose arithmetic, number theory and descriptive statistics tools. The largest topic in the library.

All 2 in Mathematics →

Writing & Research

3

Counting, timing and citing. Nothing here writes anything for you — they measure what you have written.

All 3 in Writing & Research →

Seven input patterns behind every page.

The library is large but not sprawling: every tool is one of seven shapes. Knowing which one you are looking at tells you what it wants from you before you read a single label.

A · Few numeric fields

2–6 numeric inputs, one headline answer, the formula shown beneath it.

1 tool

B · Repeating rows

A table the user adds rows to, with a running total.

5 tools

C · Text in, counts out

A large textarea with live counts. No submit button.

3 tools

D · Mode switcher

One tool, several modes; the control changes which inputs show.

0 tools

E · Dates and planning

Dates and durations in, a schedule or timeline out.

0 tools

F · Dataset in

Paste a column of numbers; n-count, statistics and a small chart out.

1 tool

G · Expression in, steps out

A formula in, worked steps out — rendered mathematics, not one number.

0 tools

What the library will not do.

  • No email gate — no tool asks for an address before showing a result, and none ever will. The library exists to be used instead of ordering, which only works if it is actually usable.
  • No account wall — nothing is saved server-side, so there is nothing to log into. Close the tab and your inputs are gone.
  • No countdown timers or fake scarcity — the countdown tools compute dates. None of them is styled to make you anxious, and no price on this site expires while you look at it.
  • No bare answers — every result shows the formula and the intermediate quantities. A number with no working is worth almost nothing in a marked script.
  • No tracking of what you compute — the arithmetic runs in your browser. We do not receive your grades, your data, or your essay text.

A calculator is not always the answer.

These tools compute. They do not explain a method you have not been taught, and they do not sit an assessment for you. If the difficulty is that you cannot follow the method, a worked answer from a calculator will not survive the next question on the paper.

When that is the situation, the honest move is a tutor, your module leader, or a worked model answer you can study against your own attempt. We sell the third of those, and we would rather say so plainly here than dress it up as a feature of a free tool.

Ask about a model answerWhere we draw the line

Calculators are provided for study and planning. Results are not official records, professional advice, or a substitute for your institution's own figures.