How do I find X% of a number?

Choose the percent-of mode, enter the percentage and the base number, and the page will return the resulting value.

How do I work out what percent one number is of another?

Choose the what-percent mode, enter the part value and the whole value, and the page will calculate the percentage relationship.

What percentage is 30 of 120?

Use the what-percent mode, enter 30 as the part and 120 as the whole, and the page will show that 30 is 25% of 120.

How do I calculate percentage increase?

Enter the original value and the higher new value. The page divides the change by the original value and converts the result into a percentage.

How do I calculate percentage decrease?

Enter the original value and the lower new value. The page calculates the drop relative to the original value.

What is the difference between percentage change and percentage points?

Percentage change is relative to the original value, while percentage points describe the direct gap between two percentage values. This page calculates relative percentage change.

Why can't the whole or original value be 0?

Because the percentage relationship depends on dividing by the reference value. When that value is 0, the result is not meaningful for standard percentage formulas.

Percentage Calculator

Use one page to calculate percentage of a number, check what percent one value is of another, and solve percentage increase or decrease without jumping into discount or bill-specific tools.

Choose a percentage task

Switch between four common percentage problems instead of spreading closely related math tasks across multiple separate pages.

Percentage

Enter the percentage value you want to apply to the base number.

Base number

This is the number the percentage is being taken from.

The calculation runs in your browser. If you copy the link, the current mode and numbers are included in the URL.

Results update instantly as inputs change, which makes it easy to compare several percentage scenarios without reloading.

Percentage result

Review the direct percentage answer and supporting values below.

Choose a percentage task to begin

As soon as the required values for the selected mode are valid, the page will show the result automatically.

How this percentage calculator works

Choose the percentage question first, then enter only the numbers that mode needs. The page is built for direct percent math, what-percent questions, and percentage change rather than shopping or payment workflows.

1. Choose the kind of percentage question

Pick whether you need a percent of a number, what percent one number is of another, or a percentage increase or decrease.

2. Enter the values for that mode

Each mode only asks for the numbers needed for that specific calculation, which keeps the page simple and fast.

3. Read the direct answer and context

The result shows the main percentage answer first, then supporting values such as the original number, the compared number, or the absolute difference.

Why this page focuses on four percentage tasks

Most users who search for a percentage calculator want a fast answer to one of four questions: percent of a number, what percent, percentage increase, or percentage decrease.

This page stays general on purpose. Discounts, sales tax, tip, and markup are related tools, but they belong to more specific consumer or pricing workflows.

Many users phrase the same intent in slightly different ways, such as calculate percentage, what percentage is X of Y, or percent increase. This page keeps those close queries together instead of splitting them too early.

A percentage change is not the same thing as percentage points. This page focuses on relative percentage change based on the original value.

When the reference or original value is 0, some percentage formulas stop making sense. The page validates those cases instead of returning misleading output.

Percentage calculator FAQ

How do I find X% of a number?: Choose the percent-of mode, enter the percentage and the base number, and the page will return the resulting value.
How do I work out what percent one number is of another?: Choose the what-percent mode, enter the part value and the whole value, and the page will calculate the percentage relationship.
What percentage is 30 of 120?: Use the what-percent mode, enter 30 as the part and 120 as the whole, and the page will show that 30 is 25% of 120.
How do I calculate percentage increase?: Enter the original value and the higher new value. The page divides the change by the original value and converts the result into a percentage.
How do I calculate percentage decrease?: Enter the original value and the lower new value. The page calculates the drop relative to the original value.
What is the difference between percentage change and percentage points?: Percentage change is relative to the original value, while percentage points describe the direct gap between two percentage values. This page calculates relative percentage change.
Why can't the whole or original value be 0?: Because the percentage relationship depends on dividing by the reference value. When that value is 0, the result is not meaningful for standard percentage formulas.

Related percentage and pricing tools

This page is the broad entry point for general percentage math, including calculate-percent, what-percent, and percentage-change questions. Move to the related pricing tools when the task becomes discount pricing, bill totals, or tax-aware payment math.

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Move into the money cluster when the percentage question turns into tip amount, bill total, or per-person payment.

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Tax and Tip Calculator

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