Homework math is easier to check when you can see every step. This calculator for students and teachers lets you name the values in a problem, write the formula the way it reads in your notes, and read the answer next to each line. Change one value and every line that uses it updates, which makes it quick to test “what if I score 80 instead?”
Every example shows what Notes Calculator answers. Choose Open in Notes Calculator to open it in the web app and try your own numbers.
A weighted course grade
When homework, quizzes and the exam count for different shares of the grade, multiply each by its weight and add them up.
| Note | Result |
|---|---|
| homework = 92 | 92 |
| quizzes = 85 | 85 |
| exam = 78 | 78 |
| homework * 30% + quizzes * 20% + exam * 50% | 83.60 |
The score you need on the final
Notes Calculator does not rearrange a formula to find an unknown, but you can do that step yourself. If your current grade counts for 60% and the final for 40%, the score you need is the target minus what you already have, divided by the final’s weight.
| Note | Result |
|---|---|
| current = 84 | 84 |
| target = 90 | 90 |
| Needed on the final: (target - current * 60%) / 40% | 99 |
Physics with named values
Name each quantity once and the formula reads like your textbook. Change the mass and both answers update.
| Note | Result |
|---|---|
| mass = 10 | 10 |
| acceleration = 9.8 | 9.80 |
| force = mass * acceleration | 98 |
| Work over 2.5 m: force * 2.5 | 245 |
Unit conversions work on their own lines too: 5 miles to km or 100 °F to °C. The unit converter guide lists what you can convert.
Test percentages and a curve
Teachers can turn a raw score into a percentage and apply a curve. Make the curve explicit: adding five points is not the same as adding 5%.
| Note | Result |
|---|---|
| score = 43 | 43 |
| possible = 50 | 50 |
| score / possible as % | 86% |
| Curved by 5 points: (score + 5) / possible as % | 96% |
| Curved by 5% of the score: (score + 5%) / possible as % | 90.30% |
A class average
Label each line with the student’s name and type average underneath. A blank line above the list keeps earlier numbers out of it.
| Note | Result |
|---|---|
| Ana: 82 | 82 |
| Ben: 91 | 91 |
| Chloe: 76 | 76 |
| Dev: 88 | 88 |
| average | 84.25 |
For grade point averages across a semester, see the GPA calculator guide, and for percentage questions such as “what percent of 50 is 43”, the percentage calculator guide.
Notes Calculator is free in the browser at app.notescalculator.com. If you want a separate note for each subject or class, synced to your phone, see what Lifetime adds.