TOOLOG TOOL

Percent Calculator | Percentage, Ratio, and Change Rate

Instantly calculate A% of B, what percent A is of B, and increase/decrease rate for reports, pricing, and daily math.

Math/Finance

Calculation type A% of B A is what percent of B Rate of change

-Main result

-Secondary result

-Difference

Waiting for inputStatus

Enter values to calculate instantly.

What can this percent calculator do?

This tool covers three common cases in one place:

• Calculate A% of B
• Calculate A is what percent of B
• Calculate increase/decrease rate from old value to new value

Key features

• Three calculation modes for practical use
• Fast results as soon as values are entered
• Validation for zero-division and invalid inputs
• Clear output with percentage and difference values

How to use

1. Choose a mode.
2. Enter your numbers.
3. Check percent result and difference.
4. Reuse for discounts, KPI changes, and report summaries.

Common examples

• Discount amount from list price
• Product share of total sales
• Month-over-month growth rate

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