For Teachers
A stack of tests to grade, a curve to apply, a class to time — and zero budget for "premium education software". Here's a toolkit that does the math and stays free.
Grade a whole stack in minutes
- Random Team Generator Split a list into fair random teams — names stay in your browser.
- Test Grade Calculator Questions and mistakes in — percentage and letter grade out.
- Grade Curve Calculator Square root, flat or high-score curve — with the exact lift.
- Weighted Grade Calculator Course grade from category weights — homework, exams, final.
- Final Grade Calculator What score you need on the final to hit your goal grade.
- Cumulative GPA Calculator Add this semester and see your new overall GPA.
- Percentage to GPA Any percentage to the 4.0 scale — with the full table.
- Attendance Calculator Your %, safe-to-miss budget, and the streak to recover.
- GPA Calculator Grade Point Average on the 4.0 scale, course by course.
Put any of them on your school website
Every tool has an embed widget: one line of code, works on school sites, class pages and most LMS content blocks, resizes itself, never expires and never asks your students to sign up. Your class page gets a working GPA calculator; we get a small "Powered by CalcNotebook" line — that's the whole deal. Fixes and improvements reach embedded widgets automatically: install once, never maintain.
Classroom timers
Timed quizzes, station rotations, "beat the timer" clean-ups — with a chime and a countdown that lives in the tab title (projector-friendly):
Privacy that passes the IT department
- Nothing students type is sent anywhere — calculations run entirely in the browser.
- No accounts, no emails, no logins — nothing to manage, nothing to leak.
- No ads interrupting a lesson — the site is deliberately clean.
Frequently asked questions
Is everything really free for classroom use?
Yes — every calculator, timer and embed widget is free, with no accounts, no sign-in walls and no limits on class size. Free is the product, not a trial.
Can I embed a calculator into my school website or LMS?
Yes: each tool has a one-line embed code (see the Widgets page) that works anywhere HTML is allowed — school sites, class pages, Moodle and most LMS content blocks. The widget resizes itself and stays free.
What happens to what students type?
Nothing — calculations run entirely in the browser, so grades, scores and names never leave the student's device. There are no accounts and nothing to store.
Which tool grades a stack of tests fastest?
The Test Grade Calculator: set the number of questions once, open the built-in easy-grader chart, and every wrong-answer count with its percentage and letter is visible at a glance — grade the whole pile without touching a key again.
Missing a tool your classroom needs? Tell us — teacher requests go to the top of the build list.