Percentages are everywhere — discounts, GST, salary hikes, marks, interest rates, profit margins. Yet many people struggle with percentage calculations beyond simple ones. This guide explains all four types of percentage calculations with clear formulas and real examples — and shows you how to calculate any percentage instantly online.
4 Types of Percentage Calculations
| Type | Question | Formula |
|---|---|---|
| % of a number | What is 15% of 2,000? | Value = Total x Percent / 100 |
| What % is X of Y | 45 is what % of 180? | Percent = (X / Y) x 100 |
| % increase/decrease | Price changed from 800 to 960 — what % increase? | Change% = (New-Old) / Old x 100 |
| Find the total | 30 is 12% of what number? | Total = Value x 100 / Percent |
Our free percentage calculator handles all 4 types with one click.
How to Find X% of a Number
Formula: Result = (Percentage / 100) x Number
Examples:
- What is 18% of Rs 50,000? Answer: (18/100) x 50,000 = Rs 9,000 (GST amount)
- What is 15% of 80 marks? Answer: (15/100) x 80 = 12 marks
- What is 30% of 5,000 calories? Answer: (30/100) x 5,000 = 1,500 calories
This type is used for: calculating GST amounts, finding discounts, calculating commissions, and determining percentages of budgets.
How to Find What Percent X is of Y
Formula: Percentage = (X / Y) x 100
Examples:
- You scored 72 out of 90 marks. What percentage? (72/90) x 100 = 80%
- You spent Rs 3,500 out of a Rs 12,000 budget. What percent spent? (3500/12000) x 100 = 29.2%
- Your SIP gave Rs 15,000 profit on Rs 60,000 invested. What % return? (15000/60000) x 100 = 25%
Combine with our profit margin calculator for business calculations.
How to Calculate Percentage Increase or Decrease
Formula: Percentage Change = ((New Value - Old Value) / Old Value) x 100
Positive result = increase. Negative result = decrease.
- Salary changed from Rs 45,000 to Rs 54,000. Increase? ((54000-45000)/45000) x 100 = 20% increase
- Product price dropped from Rs 2,400 to Rs 1,800. Decrease? ((1800-2400)/2400) x 100 = -25% decrease
- Nifty went from 18,000 to 22,500. Gain? ((22500-18000)/18000) x 100 = 25% gain
How to Find the Total When Percentage is Known
Formula: Total = (Value x 100) / Percentage
Examples:
- You paid Rs 9,000 as 18% GST. What was the original amount? (9000 x 100) / 18 = Rs 50,000
- 60 students passed which is 75% of the class. Total students? (60 x 100) / 75 = 80 students
- Rs 1,200 is 40% of your monthly savings. Total savings? (1200 x 100) / 40 = Rs 3,000
Real-Life Percentage Examples for India
| Situation | Calculation | Answer |
|---|---|---|
| GST on Rs 10,000 at 18% | 10,000 x 18 / 100 | Rs 1,800 GST |
| 10% discount on Rs 3,500 | 3,500 x 10 / 100 | Rs 350 discount |
| 12% annual interest on Rs 50,000 | 50,000 x 12 / 100 | Rs 6,000 per year |
| Salary hike from Rs 40,000 to Rs 46,000 | (6,000/40,000) x 100 | 15% hike |
| Scored 288 out of 360 | (288/360) x 100 | 80% marks |
For tax and finance calculations, also use our GST calculator and interest calculator for complete results.