Percentage Calculator

Percentage Calculator

What is
%
of
?
20

Visual Proportion

10% is 1/10th of the total.

How to Calculate Percentage: A Complete Guide

Whether you are an engineer calculating a safety factor, an investor analyzing portfolio growth, or a student solving a math problem, understanding percentages is essential. A percentage represents a part of a whole expressed as a fraction of 100.

The Percentage Formula

To find the percentage of a number manually, use the following standard equation:

Percentage = (Part / Whole) × 100
[Image of the percentage formula triangle]

Common Real-World Examples

Engineering & Construction If a concrete mix requires 15% more water than the baseline of 100 liters, you add 15 liters.
Finance & Investing If your $1,000 investment grows to $1,200, you have seen a 20% increase in your portfolio value.
Retail & Shopping A 30% discount on a $50 item saves you $15, making the final price $35.

Step-by-Step: How to use our Percentage Calculator

  1. Enter the Percentage: Input the percentage value you are looking for (e.g., 15).
  2. Enter the Total: Input the whole number you are calculating from (e.g., 200).
  3. Instant Result: Our tool uses high-precision algorithms to provide the result immediately, complete with a visual proportion bar for better clarity.

Frequently Asked Questions (FAQ)

  • How do I calculate 20% of a number? Multiply the number by 0.20. For example, 20% of 50 is 50 × 0.20 = 10.
  • What is the decimal of 5%? To convert a percentage to a decimal, divide by 100. 5% becomes 0.05.
  • How do you find the percentage difference? Subtract the old value from the new value, divide by the old value, and multiply by 100.
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