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Percentage Calculator

Percentage, increase and decrease calculations

About Percentage Calculator

The Percentage Calculator bundles the four most common percentage questions into a single, mode-switching interface so you never have to remember which formula applies. Ask 'what is 18% of $85.50' in the first mode, 'what percentage is 47 out of 60' in the second, 'what is 1,200 increased by 12.5%' in the third, and 'what was the original price before a 20% tax was added' in the reverse mode. Students checking exam scores, shoppers comparing discounts, analysts computing year-over-year growth, and accountants stripping VAT from gross receipts all reach for this daily. Calculations are performed with decimal-safe arithmetic to avoid floating-point rounding that plagues spreadsheet percentage formulas, and results include the absolute change alongside the percentage so you always know both the rate and the dollar figure in one glance.

Why use Percentage Calculator

Four Modes in One

A single tool handles every common percentage question — finding a percentage of a value, expressing a number as a percentage of another, computing a percentage increase, or computing a decrease — without opening multiple calculators or recalling separate formulas for each scenario.

Reverse Percentage

Finding the original price before tax, markup, or discount is applied requires a different formula than a standard percentage calculation. Reverse mode handles this automatically, so you can strip GST, VAT, or a retailer's markup from any gross figure instantly.

Percent Change

Year-over-year growth, revenue change, or performance delta between two values is shown with the correct sign — positive for growth, negative for decline. This is the standard metric used in financial reporting, dashboards, and academic papers.

Decimal-safe Math

Floating-point arithmetic in spreadsheets and pocket calculators often produces tiny rounding errors on tax-style values such as 18% of $85.50. This tool uses decimal-aware arithmetic to return clean, presentation-ready numbers with the correct number of decimal places.

Copy-ready Output

Every result has a one-click copy button so you can paste it directly into a spreadsheet cell, a Slack message, an email, or a report without retyping or risk of transcription error. The output is formatted to the precision appropriate for the calculation type.

Mobile-friendly

Large input fields, large tap-target buttons, and a layout that reflows to a single column on small screens mean you can use this tool in a store aisle, at the restaurant table, or anywhere else you need a quick answer on a phone.

How to use Percentage Calculator

Pick the mode that matches your question: percentage of a value, X is what percent of Y, percentage increase, or percentage decrease
Enter the two numbers the selected mode requires in the input fields
Read the live result — output updates as you type without needing to press a button
Check the absolute change displayed alongside the percentage for full context
Switch to a different mode to cross-verify or answer a related question
Click the copy button to send the result to your clipboard for a report or spreadsheet

When to use Percentage Calculator

Calculating tax, tip, or service charge as a percentage of a bill amount
Finding your exam or test score as a percentage of the total available marks
Computing the year-over-year or month-over-month growth rate between two revenue figures
Reversing a VAT, GST, or sales tax to find the pre-tax net price from a gross total
Figuring out how much money you save on a discounted item before purchasing
Expressing a survey result, budget allocation, or composition as a percentage of the whole

Examples

What is 18% of $85.50

Input: Mode: % of value, Percent: 18, Value: 85.50

Output: 15.39

Score as percent

Input: Mode: X is what % of Y, X: 47, Y: 60

Output: 78.33%

Price increase

Input: Mode: Increase, Original: 1,200, By: 12.5%

Output: 1,350 (change: +150)

Tips

Reverse mode is the fastest way to strip VAT or GST from a gross price on a receipt
Use percent-change mode for growth metrics and always keep the sign — it shows direction
When compounding two percentages, apply them sequentially, not by adding them together
Financial math usually needs exactly two decimal places — check the result before copying
Pair with the Discount Calculator when you also need to see the total savings in currency terms

Frequently Asked Questions

What is the difference between a percent and a percentage point?▾

A percent expresses a ratio relative to a base value — 20% of $100 is $20. A percentage point is the arithmetic difference between two percentages — if interest rises from 2% to 3%, that is a one percentage point increase, not a 1% increase. Confusing these two is one of the most common errors in financial reporting.

How do I reverse a percentage to find the original price?▾

Divide the final amount by (1 + rate/100) for reverse-add, or by (1 − rate/100) for reverse-subtract. For example, to find the pre-GST price when the gross total is ₹1,180 at 18% GST: ₹1,180 ÷ 1.18 = ₹1,000. The reverse mode does this automatically.

Why does a 50% increase followed by a 50% decrease not return the original?▾

Because each percentage operates on a different base. Starting with 100, a 50% increase gives 150, and a 50% decrease of 150 gives 75 — not 100. Percentage changes are multiplicative, not additive, so they don't simply cancel each other out.

How do I compute year-over-year growth?▾

Use the percent-change mode: enter the old value and the new value. The formula is ((new − old) / old) × 100. A positive result is growth; a negative result is a decline. Both the percentage and the absolute change are shown in the result.

Does this round results — and to how many decimals?▾

Results are rounded to two decimal places by default, which is appropriate for most financial and academic use cases. Currency amounts display exactly two decimals; pure percentage outputs show two decimals. For scientific precision you can read the full unrounded value before copying.

How do I find what percent X is of Y?▾

Select the 'X is what % of Y' mode, enter X as the first number and Y as the second. The formula applied is (X ÷ Y) × 100. For example, 47 ÷ 60 × 100 = 78.33%.

Can I use negative percentages?▾

Yes. A negative percentage in the increase mode produces the same result as the decrease mode, and vice versa. Percent-change results are signed — negative means the new value is less than the old value.

What is percent error and how do I calculate it?▾

Percent error measures how far a measured or estimated value is from the true value: ((|measured − true|) / |true|) × 100. Use the percent-change mode with the true value as Y and the measured value as X, then take the absolute value of the result.

Explore the category

Glossary

Percent: A ratio expressed as a fraction of 100, denoted by the % symbol. 'Per cent' literally means 'per hundred', so 25% means 25 out of every 100 units.
Percentage Point: The arithmetic difference between two percentage values. If unemployment rises from 4% to 6%, it increases by 2 percentage points — not by 2% (which would mean 2% of 4%, equalling 0.08%).
Base Value: The reference quantity from which a percentage is calculated. In 'what is 20% of $50', the base value is $50. Choosing the wrong base is the most common cause of percentage errors.
Percent Change: A measure of how much a value has grown or shrunk relative to its starting point, calculated as ((new − old) / old) × 100. A positive result is an increase; a negative result is a decrease.
Markup: The percentage added to a cost price to arrive at a selling price, calculated as (profit ÷ cost) × 100. A markup of 25% on a $100 item produces a $125 selling price.
Markdown: The percentage reduction applied to a price, typically to clear inventory or run a promotion. A 20% markdown on $125 reduces the price to $100 — the inverse of a 25% markup in this example.