Free Percentage Calculator Online: Solve Any Percent Problem Instantly
Percentage problems come up constantly. What is 15% of 2,400? A product was 3,500 and is now 2,800 -- what percentage discount is that? Your salary went from 80,000 to 95,000 -- what is the percentage increase? These are quick calculations but they trip people up because the formula changes depending on what you are trying to find.
A free online percentage calculator handles every variation instantly. This guide explains the four main types of percentage problems and how to solve each one without doing the math manually.
The 4 Types of Percentage Problems
What is X% of Y?
What is 20% of 500? = 100
Discounts, tax, tips
X is what % of Y?
75 is what % of 300? = 25%
Test scores, ratios
% increase from X to Y
100 to 130 = 30% increase
Salary, prices, growth
% decrease from X to Y
500 to 350 = 30% decrease
Sales, weight loss, drops
How to Calculate Percentages Online for Free
- 1
Go to toolzgo.com/tools/math-tools/percentage-calculator
- 2
Select the type of percentage problem you need to solve
- 3
Enter the known values into the fields
- 4
The answer appears instantly as you type
- 5
Copy the result or use the explanation shown below the answer
Percentage Formulas for Reference
Real-World Examples
Shopping discounts
A shirt costs 2,400 PKR. There is a 30% sale. The discount is 720 PKR and you pay 1,680 PKR. Use the "What is X% of Y?" mode to find the discount amount.
Exam results
You scored 74 out of 90 marks. To find your percentage: 74 / 90 x 100 = 82.2%. Use the "X is what % of Y?" mode for this.
Salary negotiation
Your current salary is 85,000. You want to ask for a 20% raise. That is 17,000 more, so you should ask for 102,000. Use "What is X% of Y?" to calculate the raise amount.
Tracking growth
Your website had 1,200 visitors last month and 1,850 this month. The growth rate is ((1850 - 1200) / 1200) x 100 = 54.2%. Use the percentage increase mode.
Frequently Asked Questions
What is the difference between percentage increase and percentage point increase?
If interest rates go from 5% to 8%, the percentage point increase is 3 (simple subtraction). The percentage increase is 60% ((3/5) x 100). They sound similar but mean very different things.
How do I find the original price before a discount?
Divide the sale price by (1 - discount rate). For example, if you paid 1,400 after a 30% discount: 1400 / 0.70 = 2,000. That was the original price.
Can I calculate GST or VAT with this tool?
Yes. To find the tax-inclusive price, use "What is X% of Y?" to find the tax amount, then add it to the original price. For 17% GST on 1,000 PKR: 17% of 1,000 = 170, so total is 1,170.
How accurate is the calculation?
The calculator uses standard JavaScript floating-point arithmetic and rounds to 2 decimal places for practical display. For financial calculations requiring more precision, the raw result is available.
More calculators: discount calculator, loan calculator, tip calculator, all free.
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