3-in-1 Precision Percentage Calculator — ZYCalculator

A percentage calculator computes what X% of Y equals, finds what proportion X is of Y, and calculates percentage increase or decrease between two numbers.

Formula & Method

Mode 1: (P × V) / 100 | Mode 2: (X / Y) × 100 | Mode 3: ((To - From) / From) × 100

How to Use

  1. Select Calculation Mode: Choose between Direct Percentage (X% of Y), Ratio (X is what % of Y), or Increase/Decrease.
  2. Enter Values or Choose Presets: Input numbers or click quick preset chips for tips, tax, and standard discounts.
  3. Copy & Share Results: Copy formatted answer to clipboard or share deep link with friends.

Frequently Asked Questions

How do I calculate what is X% of a number?

Multiply the total value by the percentage number, then divide by 100. For example, to calculate 18% of $2,500: (18 × 2500) ÷ 100 = $450.00.

How do I calculate percentage increase or decrease between two numbers?

Subtract the old value from the new value, divide the result by the absolute old value, and multiply by 100: ((New - Old) / Old) × 100.