Classroom tool

EZ Grader

Type how many questions and how many wrong. Get the percentage and letter grade instantly.

90.0%
A
18 of 20 correct
Customize grade scale

Full reference

WrongRightScoreGrade

About this tool

A digital version of the cardboard EZ-Grader sliders that have lived on teachers' desks for half a century. Type the total number of questions and the number wrong, see the percentage and letter grade. The full reference table shows every possible score for the total you entered, so when you're grading a stack of tests you can scan to the right row instead of retyping for every paper.

Everything runs in the browser. No accounts, no analytics, no telemetry — and the numbers reset when you close the tab.

See also: grading a whole course instead of a single test? Use the Weighted Grade Calculator.

How to use it

  1. Type the total number of questions on the test (or assignment).
  2. Type how many the student got wrong. The percentage and letter grade update instantly.
  3. Look at the reference table below to see every possible score for that total. Useful while grading a stack of papers.
  4. To use a non-standard grade scale (e.g. AP-style or a mastery-based scale), open Customize grade scale and set your own thresholds.

Common grade scales

The defaults — A ≥ 90, B ≥ 80, C ≥ 70, D ≥ 60 — match the most common US K-12 and introductory college scale. Some other scales you may want to use:

  • 10-point honors / AP scale. Same defaults, sometimes with a +/- modifier (e.g. 93 = A, 90 = A-) — this tool currently uses single letters; partial credit refinement may come later.
  • 7-point scale. A ≥ 93, B ≥ 85, C ≥ 77, D ≥ 70. Common in some districts and states.
  • Mastery-based. A ≥ 80, B ≥ 70, C ≥ 60, D ≥ 50. Where "mastery" of the standard means crossing a lower bar than traditional grading expects.
  • Pass/fail. Set A ≥ 60 (or your pass cutoff), leave the others at zero — anything passing comes back as A, anything failing comes back as F.

Why teachers still use a grading slider

Grading a class set of 30 tests with 20 questions each is 600 question-checks plus 30 percentage calculations. The mental math is trivial — but doing it 30 times in a row, while also marking incorrect answers and double-checking, costs more attention than the math itself. A cardboard EZ-Grader, or a tab open in the browser with a reference table, replaces "calculate" with "look up." Less attention spent on arithmetic means more attention left for the actual feedback you write on the paper.

Frequently asked questions

How is the percentage calculated?

(Right ÷ total) × 100, rounded to one decimal place.

Can I change the grade scale?

Yes — open Customize grade scale and set your own A/B/C/D thresholds. Reset to standard restores the default 90/80/70/60.

Why does the table show every possible score?

So you can scan to the row matching the number wrong on each paper instead of retyping. Print the page for a physical reference card.

Does it work for weighted questions?

Not directly — this is for tests where every question counts equally. For weighted scoring, calculate points-earned ÷ points-possible separately. For weighted scoring across categories, use our Weighted Grade Calculator.

Are my entries saved or sent anywhere?

No. Everything runs in your browser; nothing is stored or sent.

Where does "EZ Grader" come from?

Generations of teachers used the physical cardboard slider. This is the digital version — same job, no slider to lose.

More from AnchorKite

Need a printable roster too? Try the Attendance Sheet Generator. If a whole class's test scores came in lower than expected, read When to curve grades, and which curve to use. Running classroom activities? Browse all teacher tools.