You see a number change, a salary, a price, a stock, a discount, and you need to know exactly how much it went up or down, in percentage terms. Simple in theory, but the moment you search for it, three different terms show up: percentage increase, percentage decrease, and percentage change. Which one do you actually need?
Here’s the quick answer, then we’ll go deeper on each one.
- Percentage increase: the number went up, and you want to know by what percent.
- Percentage decrease: the number went down, and you want to know by what percent.
- Percentage change: the general term for either direction. If you’re not sure yet whether your number went up or down (or you’re writing a report that needs to cover both), “percentage change” is the umbrella term.
Once you know which one applies to your situation, the rest gets a lot easier.
What Is Percentage Increase?
Percentage increase tells you how much a number has grown, expressed as a percentage of where it started. It’s used constantly in everyday situations, a raise at work, a rent hike, a business’s revenue growing year over year, or a stock price climbing.
The basic idea: you compare how much the number grew to what it originally was, then express that as a percentage.
For example, if your salary went from $45,000 to $52,000, you’ve had a percentage increase, and it’s a bigger deal than just “$7,000 more,” because $7,000 means something different depending on your starting salary.
Want the exact number without doing the math yourself? Use our Percentage Increase Calculator , just enter your starting and ending values and it shows the result instantly, along with the steps.
What Is Percentage Decrease?
Percentage decrease works the same way, just in reverse, it tells you how much a number has shrunk, as a percentage of where it started. Think of a discounted price, a drop in website traffic, or a company’s profits shrinking from one quarter to the next.
For example, a jacket that dropped from $80 to $60 didn’t just get “$20 cheaper”. in percentage terms, that’s a 25% decrease, which is the number that actually helps you judge whether it’s a good deal.
Need to calculate one quickly? Try our Percentage Decrease Calculator , enter your two numbers and get the answer with full steps shown.
Percentage Points vs. Percentage Change: The Confusion Everyone Gets Wrong
This is where most people, and honestly, a lot of news articles, get it wrong. “Percentage points” and “percentage change” sound almost identical, but they mean completely different things, and mixing them up can make a number look far bigger or smaller than it really is.
Here’s the difference in plain terms:
A percentage point is the straightforward, literal gap between two percentages. If an interest rate goes from 5% to 7%, that’s a rise of 2 percentage points, you just subtract one from the other.
A percentage change looks at that same jump differently, it asks, “how big is that increase relative to the starting number?” Using the same example, going from 5% to 7% is actually a 40% increase (because 2 is 40% of 5).
Same numbers. Two very different-sounding answers. Neither one is “wrong”, they’re just answering different questions.
This matters most in situations involving rates and percentages that are already percentages themselves, interest rates, inflation, tax rates, approval ratings, and conversion rates.
A few real examples where this trips people up:
- A news headline says “inflation rose from 3% to 4%.” That’s a rise of 1 percentage point, but described as a percentage change, prices are rising 33% faster than before.
- A politician’s approval rating moves from 40% to 45%. That’s 5 percentage points, but as a percentage change, their approval actually jumped 12.5%.
- A bank raises its interest rate from 2% to 3%. That’s 1 percentage point, but borrowers are now paying 50% more in interest, percentage-wise.
The safest habit: whenever you see a change between two percentages, ask whether the number you’re reading is the plain point difference or the relative percentage change. They can tell very different stories about the same event.
Percentage Change in Real Life: Career, Business, Investing & Everyday Situations
The math behind percentage change never changes, but the situations where you need it are everywhere. Here’s how it shows up across different parts of life, with real numbers, not abstract examples.
Career: Negotiating a Raise or Understanding a Promotion
When you’re offered a raise, the dollar amount alone doesn’t tell you much. A $3,000 raise sounds identical whether your salary is $40,000 or $120,000, but as a percentage, those are wildly different outcomes: a 7.5% increase versus a 2.5% increase.
This is also why recruiters and HR teams talk in percentages during offer negotiations, a “10-15% increase over your current salary” is the industry-standard way to benchmark a fair raise, regardless of what industry or salary range you’re in.
Business: Year-Over-Year Revenue and Conversion Rates
Businesses track percentage change constantly, usually as YoY (year-over-year) growth. If a company’s revenue went from $500,000 to $620,000 in a year, that’s a 24% YoY increase, a number that gets reported to investors, used in performance reviews, and compared against competitors.
The same logic applies to marketing: if a website’s conversion rate moves from 2% to 2.6%, that’s technically a small “percentage point” gain (0.6 points), but as a percentage change, it’s actually a 30% improvement in how many visitors convert, which is a significant win for a marketing team.
Investing: Portfolio and Stock Growth
Investors live and die by percentage change. A stock moving from $50 to $65 per share is a 30% gain, and this is the number used to compare performance against the market, other stocks, or an index fund, regardless of how many shares someone owns.
This is also where CAGR (Compound Annual Growth Rate) comes in, it’s essentially a percentage change calculation applied per year, used to smooth out an investment’s growth over multiple years instead of just looking at the start and end points.
Everyday Life: Discounts, Tips, and Fitness Progress
Percentage change shows up in smaller, everyday decisions too. A 30%-off sale on a $120 jacket brings it down to $84,and knowing the percentage helps you judge whether a “sale” is actually a good deal or just a small markdown dressed up as one.
It also applies outside of money, someone tracking fitness progress who drops from 200 lbs to 180 lbs has achieved a 10% decrease in body weight, a number that’s often more motivating and meaningful to track over time than the raw pounds lost.
How to Calculate Percentage Change in Excel or Google Sheets
If you’re working with numbers in a spreadsheet, tracking expenses, sales, or personal budgets, you don’t need a separate calculator every time. Both Excel and Google Sheets use the exact same formula, so whichever one you use, the steps below work identically.
The formula:
If your starting value is in cell A2 and your new value is in cell B2, enter this in cell C2:
=(B2-A2)/A2
Then format cell C2 as a percentage (right-click → Format Cells → Percentage in Excel, or Format → Number → Percent in Google Sheets). This automatically converts the decimal result into a readable percentage, like 15% instead of 0.15.
Step-by-step:
- Put your starting value in one cell (e.g., A2 = 200)
- Put your new value in the next cell (e.g., B2 = 250)
- In a third cell, type
=(B2-A2)/A2 - Format that cell as a percentage
- The result will show 25%, a 25% increase from 200 to 250
A quick tip: if you’re calculating this for many rows at once (like a full year of monthly sales), enter the formula once in the first row, then drag the small square at the bottom-right corner of that cell down through the rest of your rows. Excel and Sheets will automatically adjust the cell references for each row.
One thing to watch for: if your starting value is negative (which happens with things like profit/loss numbers), the plain formula above can give a misleading result. In that case, wrap it with the ABS function: =(B2-A2)/ABS(A2), this keeps the percentage direction accurate even when working with negative number.
Which Calculator Should You Use?
By now you understand the concepts, but if you just want the fastest way to get your answer, here’s a quick guide to picking the right tool for your exact situation:
| Your Situation | Calculator to Use |
| You know the starting and ending number, and the number went up | Percentage Increase Calculator |
| You know the starting and ending number, and the number went down | Percentage Decrease Calculator |
| You know the final result and the percentage, and need to find the original number | Reverse Percentage Calculator |
| You’re working with a fraction and need it as a percentage | Fraction to Percent Calculator |
Bookmark this page, whichever situation you run into next, you’ll know exactly which tool to reach for.
Final Thoughts
Percentage change looks intimidating mostly because of the terminology, not the math. Once you separate “percentage increase” from “percentage decrease,” understand that “percentage points” and “percentage change” answer two different questions, and know which calculator fits your exact situation, the rest is just plugging in numbers.
Whether you’re negotiating a raise, checking if a sale is really worth it, or reporting your business’s growth, the same simple formula is doing the work behind the scenes every time.
