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Percentage Calculator

Calculate percentages, percentage change, and percent-of values.

Calculate percentages, percentage change, and percent-of values. This simple tool runs in your browser and gives an instant estimate.

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Result

Enter your values and tap Calculate.

Example

Pick a calculation type above and we'll show you a worked example here.

How to use this calculator

Pick the type of calculation you want to do. The input labels change to match the question you're answering. Press Calculate to see the result and a worked example.

Use results as general planning estimates only.

How to use the Percentage Calculator

Calculate what percentage one number is of another; find a percentage of a value; calculate percentage increase or decrease between two numbers.

Example workflow

To find a 15% tip on a $48 bill: enter 15 and 48, select "% of a number." To find the percentage change from 80 to 95: enter 80 and 95, select "percentage change."

Common search topics

Frequently asked questions

What types of percentage calculations does this handle?

Three modes: (1) X% of Y — for tips, discounts, and taxes; (2) X is what % of Y — for finding a ratio; (3) Percentage change from X to Y — for tracking increases or decreases.

How do I calculate a discount percentage?

Subtract the sale price from the original price, divide by the original price and multiply by 100. Example: ($50 original − $35 sale) ÷ $50 × 100 = 30% discount.

What is percentage change?

Percentage change = (New Value − Old Value) ÷ Old Value × 100. A positive result is an increase; a negative result is a decrease.

Can I use this for tax calculations?

Yes, for estimating. Enter the tax rate and the pre-tax amount to find the tax amount. For official tax purposes, always verify rates and use government or licensed tax tools.

Why does my manual result differ slightly from the calculator?

Rounding differences can occur when working with decimals manually. The calculator carries full precision and rounds only the final display value.

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People also ask

How do I calculate a tip quickly in my head?

For a 20% tip: move the decimal one place left (10%), then double it. On a $47 bill, 10% is $4.70, doubled is $9.40. For 15%: find 10%, halve it for 5%, then add. On $47: $4.70 + $2.35 = $7.05. The percentage calculator is faster for exact amounts, but mental shortcuts help at the table when you don't want to pull out a phone.

What is the difference between percentage and percentage points?

A percentage is a ratio expressed as a fraction of 100. A percentage point is the arithmetic difference between two percentages. If interest rates rise from 3% to 5%, that is a 2 percentage-point increase — but it is a 67% increase in the rate itself (2÷3). This distinction matters in financial reporting, polling, and medical statistics, where "a 2% increase" and "an increase of 2 percentage points" mean very different things.

How do I calculate percentage change year over year?

Subtract the old value from the new value, divide by the old value, then multiply by 100. Revenue went from $85,000 to $102,000: ($102,000 − $85,000) ÷ $85,000 × 100 = 20% growth. For a decline: if revenue fell from $102,000 to $85,000, the change is −16.7%. Use the "percentage change" mode in the calculator and enter old value first, new value second.

Real-world scenarios

Finding the original price after a discount

If a $68 item is already at 20% off, the original price is $68 ÷ 0.80 = $85. Common mistake: adding 20% back to $68 gives $81.60, which is wrong — that's applying 20% to the discounted price, not reversing a 20% reduction. The calculator's "X is what % of Y" mode lets you verify the math: $68 is 80% of $85.

Calculating sales tax on a purchase

To find the tax amount on a $249 purchase in a state with 8.25% sales tax: use "X% of Y" mode, enter 8.25 and 249. Result: $20.56 tax, total $269.56. To check whether a quoted total already includes tax: use "X is what % of Y" to confirm the pre-tax base. For recurring purchases like restaurant orders, the calculator eliminates the mental math of applying a local tax rate quickly.

Tracking a portfolio gain or loss

You bought shares at $1,400 and they're now worth $1,750. Use "percentage change": original $1,400, new $1,750 → +25% gain. Alternatively: invested $1,400, current value $1,750 — enter the loss or gain mode to check whether a position is worth trimming. For multiple positions, run each through separately and compare the percentage returns rather than the dollar figures to assess relative performance.