Percentage Increase Calculator
Find the percentage increase between two values, or add a known percentage to a starting value to find the new number.
Works with any numbers \u2014 salaries, prices, populations, anything that goes up. Find % Increase tells you how big the jump was between two values, and Add % to a Number grows a starting value by a percentage you already know. Results update instantly as you type.
How to Use This Calculator
- Have both the original and the new value? Use Find % Increase to see exactly how big the jump was.
- Know a starting value and a percentage you want to add? Use Add % to a Number to see the resulting value \u2014 useful for a raise, a price hike, or any planned increase.
- Results and the formula used update live as you type, though the Calculate button is there too.
Understanding Percentage Increase
A percentage increase measures growth relative to where something started, which is why the same raw difference means very different things depending on the starting point. Adding 10 to a value of 20 is a 50% increase; adding that same 10 to a value of 1,000 is only a 1% increase. That's also why a percentage increase can go well past 100% \u2014 if a value more than doubles, the increase is over 100% by definition, not an error.
The Formulas, With Worked Examples
Percentage increase between two values:Percentage Increase = ((New − Original) ÷ Original) × 100
Example: a value rises from 80 to 100. (100 − 80) ÷ 80 × 100 = 25%.
Adding a known percentage to a value:New Value = Original + (Original × Percentage ÷ 100)
Example: a $58,000 salary with a 2.5% raise becomes $58,000 + ($58,000 × 0.025) = $59,450.
Real Percentage Increase Examples
These are worked out from the exact number pairs people search for most \u2014 a quick lookup if you're checking one of these specific jumps.
| From | To | Percentage Increase |
|---|---|---|
| 2 | 3 | 50.00% |
| 15 | 20 | 33.33% |
| 20 | 30 | 50.00% |
| 63 | 75 | 19.05% |
| 80 | 100 | 25.00% |
| 130 | 156 | 20.00% |
| 200 | 250 | 25.00% |
| 58,000 | 65,000 | 12.07% |
Salary Increases and Raises
This calculator is used often for salary math, and the same two formulas above cover it: use Find % Increase to check what raise you actually got between your old and new pay, or Add % to a Number to see what a proposed raise percentage would mean in real terms before you accept it. What counts as a "good" raise varies a lot by employer, role, and location, so treat any general benchmark as a starting point for a conversation rather than a fixed target.
Frequently Asked Questions
How do you calculate percent increase?
Subtract the original value from the new value, divide that difference by the original value, then multiply by 100. Going from 80 to 100 is an increase of 20, and 20 ÷ 80 × 100 = 25%.
What is a 5% increase of $100?
$100 × 0.05 = $5, so a 5% increase brings it to $105. The Add % to a Number tab above does this for any starting value and percentage.
How do I calculate a 20% increase?
Multiply the value by 0.20 to get the amount it grows by, then add that to the original. On 250, a 20% increase is 250 × 0.20 = 50, so the result is 300.
How do I calculate a 2.5% increase?
Same method, smaller number: multiply by 0.025. A 2.5% increase on a $58,000 salary is $58,000 × 0.025 = $1,450, bringing it to $59,450 — a fairly typical cost-of-living adjustment.
Can a percentage increase be more than 100%?
Yes — it just means the new value is more than double the original. Going from 19 to 305 is a 1,505% increase; there’s no upper limit on how large a percentage increase can be.
Can there be a percentage increase from zero?
Not mathematically — the formula divides by the original value, and dividing by zero is undefined. If something goes from 0 to any positive number, it’s usually described as "new" or "from scratch" rather than expressed as a percentage increase.
How do I calculate percentage increase in Excel?
Put the original value in A1 and the new value in B1. In C1, enter =(B1-A1)/A1 and format the cell as a percentage — that’s the same formula this calculator uses.
What percentage increase counts as a good raise?
It varies by employer and role, but cost-of-living adjustments are commonly in the 2–5% range, while a promotion or significant role change is often higher, sometimes 10–20% or more. These are general patterns, not a fixed rule — your industry and location matter more than any single benchmark.
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Last updated: September 15, 2026