Percentages are everywhere—from calculating a waiter’s tip to figuring out stock market growth. But the math can be tricky. Our 5-in-1 Percentage Calculator is designed to solve every type of percentage problem you encounter in daily life.
Whether you need to find a simple percentage of a number, calculate the percentage increase of your salary, or determine the discount on a sale item, simply select the mode, enter the numbers, and get the instant result.
It follows a simple formula. To calculate an increase (like tax or a raise), you take the original number and multiply it by 1 + (Percentage / 100).
For example, to add 10% to $100: 100 * 1.10 = 110.
Our calculator handles this logic automatically in the “Increase” mode.
It measures the difference over time. If a stock goes from $50 to $80, you want to know the growth rate.
The formula is (New Price - Old Price) / Old Price.
In this case, (80 - 50) / 50 = 0.60, which means a 60% increase.
This is crucial for analyzing financial investments.
Use the “It represents” mode.
This answers questions like “I got 45 questions right out of 50, what is my grade?”.
The formula is (Part / Total) * 100. So, (45 / 50) * 100 = 90%.
This is useful for students, grading, and statistical analysis.
Precision matters.
For general math, 0 decimals might be fine (e.g., “50%”).
But for financial calculations, you need exactly 2 decimals (e.g., “$10.55”).
For scientific or engineering data, you might need 4 or 5 decimals to ensure accuracy.
Our tool lets you choose the precision that fits your specific needs.
1. All-in-One Solution:
Most online calculators only do one type of math. Ours combines 5 distinct modes into a single interface. You can switch from calculating a tip (Simple %) to analyzing a sales drop (Variation) instantly without refreshing the page.
2. Financial Accuracy:
We use the
en-USlocale formatting standard. This means the tool respects the correct usage of decimal points and thousands separators (e.g., 1,250.00), making it safe to use for accounting, invoicing, and business reports.
3. Instant “What-If” Scenarios:
The calculator updates in real-time. This allows you to play with the numbers. “What if the discount was 15% instead of 10%?” Simply type the new number, and the result updates instantly, helping you make faster decisions.
💡 Pro Tip: In the USA, a standard tip for restaurant service is 20%. Select “What is X% of a value”, enter 20 in the first box and your Bill Amount in the second to instantly see the tip amount!