What This Percentage Calculators Hub Covers
This hub is designed for people who know the kind of percentage problem they have, but do not want to open a different page for each formula. The tool above keeps the answer, formula, and explanation together for copying or sharing.
| Calculator | What it solves | Example | Best for |
|---|---|---|---|
| Percentage Of A Number | Find X% of any number | 20% of 150 = 30 | Tips, tax, portions, commissions |
| Percent Of Total | Turn part and total into a percent | 40 out of 160 = 25% | Budgets, progress, usage, completion |
| Percentage Increase | Compare old value to a larger new value | 80 to 100 = 25% increase | Price rises, growth, score gains |
| Percentage Decrease | Compare old value to a smaller new value | 100 to 80 = 20% decrease | Discounts, losses, reductions |
| Percentage Difference | Compare two values symmetrically | 80 and 100 = 22.22% difference | A/B comparisons, estimates |
| Marks Percentage | Convert earned marks to a grade percent | 45 out of 60 = 75% | Tests, classes, assignments |
| Discount Percentage | Calculate final price and savings | 20% off $150 = $120 | Shopping, coupons, sales |
Which Percentage Calculator Should I Use?
Shopping discount
Use Discount when you know the original price and sale percent. It returns both the final price and savings.
Test score or marks
Use Marks when you know points earned and points possible. It returns the grade percentage.
Budget used
Use Percent Of Total when you know the used amount and the total budget. It also explains the remaining share.
Price change
Use Increase or Decrease when you have an old value and a new value. It shows the percent change direction.
Percentage Formula Chart
| Use Case | Formula | When to use it |
|---|---|---|
| Percent of a number | X / 100 x number | Use for tips, tax, commission, portions, or "20% of 150". |
| Percent of total | part / total x 100 | Use for completion rate, budget used, quota progress, or remaining share. |
| Percentage increase | (new - old) / old x 100 | Use when a price, value, traffic count, or score goes up. |
| Percentage decrease | (old - new) / old x 100 | Use when a cost, weight, price, or metric goes down. |
| Percentage difference | |A - B| / average(A, B) x 100 | Use to compare two values without choosing a starting value. |
| Marks percentage | earned / possible x 100 | Use for test marks, assignment points, grades, and score reports. |
| Discount percentage | price - percent x price | Use for sale price, savings, coupon, tax, or money percentage checks. |
Percentage Difference vs Percentage Change
Use Percentage Change for Before-and-After Values
Percentage change uses a starting value. Example: a price moves from $80 to $100, so the increase is 25%.
Use Percentage Difference for Neutral Comparisons
Percentage difference compares two values by their average. Example: 80 and 100 differ by 22.22%.
Money Percentage Examples
Tip or tax
15% of $200 is 0.15 x 200 = $30. Use Percent Of A Number.
Sale price
20% off $150 saves $30, final price $120. Use Discount.
Budget share
$450 spent from $1,200 is 37.5%. Use Percent Of Total.