About TeacherCalc

TeacherCalc is a free set of grade calculators for the people who live with grades: teachers marking them and students earning them.

The site exists because grade arithmetic is frequent, consequential and surprisingly easy to get wrong by hand. A teacher marking thirty tests repeats the same division thirty times; a student wondering what they need on a final has to solve an equation most syllabi never write down. TeacherCalc does that arithmetic instantly, and, just as importantly, shows the formula and a worked example on every page so any result can be checked rather than merely trusted.

What you will find here

Thirty calculators cover the grading tasks of a school year: the EZ Grader and printable grading charts for paper tests, test, quiz and exam score converters, a batch grader for whole class sets, GPA calculators for college, high school, Canada and Australia, weighted and semester grade calculators, final grade and grade-needed solvers, a grade curve tool, and converters between percentages, letter grades, GPA, WAM and UK classifications. Ten longer guides explain the ideas behind the numbers.

How the calculators decide a grade

Every letter grade and grade point on this site comes from one published set of scales, kept in a single place in our code so the tools cannot drift apart: the US standard scale (A from 90%), the US plus/minus scale (A from 93%, A- from 90%), the Canadian scale (A from 85%, pass at 50%, with a 4.33 variant where universities use one) and the Australian band scale (High Distinction from 85% on a 7.0 GPA). Individual schools vary, so treat results as accurate estimates against those standard scales, and your school's recorded grade as the official one.

Where the grading scales come from

The scales on this site are the standard published scales in wide use, not scales we invented: the US ten-point band scale and plus/minus scale used by American school districts and colleges, the Canadian percentage-to-letter scale published by Canadian universities, and the Australian band scale (HD, D, C, P, F) published by Australian universities alongside the 7.0 GPA. Where institutions publish variants, a 4.33 scale in parts of Canada, or a weighted average mark in Australia, the tools either offer the variant or state plainly which standard they use. When a national or university scale changes, the affected pages are updated and re-dated. You can check the primary references yourself: College Board BigFuture (US 4.0 scale), University of British Columbia (Canadian grades), National Center for Education Statistics and Study Australia (Australian Government). Every tool and guide page on this site also carries its own “Sources & further reading” section.

How we test the calculators

Every calculator is checked against hand-worked examples before it is published, including the boundary cases where grades flip: 89.9% against 90%, a final-exam target above 100% that must be reported as unreachable rather than merely large, and curved scores that must never exceed 100. The worked example on each tool page is one of those test cases, printed so readers can re-run the check themselves. If a result on this site ever disagrees with the printed example on the same page, that is a bug, and the contact route below is the fastest way to get it fixed.

Editorial and corrections policy

Tool pages and guides carry a last-reviewed date. Reviews re-check three things: the formula, the scale boundaries, and the worked example. Corrections from readers are verified against the institution or standard involved before anything changes; when we are wrong, the page is corrected and its review date is updated. We do not silently alter a published example: if an example changes, the numbers change with it, so the page always agrees with itself.

Who runs TeacherCalc

TeacherCalc is an independent publishing project run by a small team focused on practical education tools. The site is funded by advertising, which is what keeps every calculator free with no accounts and no paywall. We are not affiliated with any school, district, examination board or university, and no institution endorses the results here; official grades are always those recorded by your own school.

Privacy by design

All calculations run in your browser. Scores you type into a calculator are never transmitted to a server, stored in an account or attached to your identity, because there is no account and no grading database behind this site. That is deliberate: student grades are sensitive, and a calculator does not need them. Our privacy policy describes the limited analytics and advertising data involved in running the site itself.

Contact

Corrections matter to us: if a scale boundary or formula on this site does not match a published standard, tell us through the contact page and we will check it against the source and fix it if we are wrong.