How do I calculate a percentage of a number?

To find a percentage of a number, use the formula: Result = (Percentage ÷ 100) × Number. For example, 15% of 15,000 = (15 ÷ 100) × 15,000 = 2,250. Use the Basic % tab in this calculator to get the answer instantly.

How do I calculate percentage increase?

Percentage increase formula: New Value = Original × (1 + Rate ÷ 100). For example, increasing ₹1,000 by 20% gives ₹1,000 × 1.20 = ₹1,200. The increase amount is ₹200. Use the Increase tab in this calculator to compute it automatically.

How do I calculate percentage decrease?

Percentage decrease formula: New Value = Original × (1 − Rate ÷ 100). For example, decreasing ₹5,000 by 12% gives ₹5,000 × 0.88 = ₹4,400. The deducted amount is ₹600. Use the Decrease tab above to solve it in one click.

What is the percentage difference formula?

Percentage difference (change) = ((Final Value − Initial Value) ÷ Initial Value) × 100. A positive result means an increase; a negative result means a decrease. Example: from 80 to 100 = ((100 − 80) ÷ 80) × 100 = +25%. Use the Diff tab above.

How do I find the original number from a percentage result (reverse percentage)?

Use the formula: Base = Known Result ÷ (Rate ÷ 100). Example: if 2,250 is 15% of a number, then Base = 2,250 ÷ 0.15 = 15,000. Switch to the Reverse % tab in this calculator to solve any reverse percentage problem instantly.

What is the difference between margin and markup?

Markup is profit as a percentage of cost: Markup% = (Profit ÷ Cost) × 100. Margin is profit as a percentage of the selling price: Margin% = (Profit ÷ Selling Price) × 100. For the same transaction, markup is always higher than margin. Use the Margin tab to calculate both.

How do I calculate GST percentage on a price?

To add GST: GST Amount = (GST Rate ÷ 100) × Base Price. Total Price = Base Price + GST Amount. Example: 18% GST on ₹2,500 = ₹450, so the total is ₹2,950. Use the Basic % tab with 18 as X and your price as Y to get the GST amount instantly.

How do I calculate a percentage discount on a price?

Discounted Price = Original Price × (1 − Discount% ÷ 100). Example: 30% off ₹1,200 = ₹1,200 × 0.70 = ₹840. You save ₹360. Use the Decrease tab to compute sale prices, or try the dedicated Discount Calculator for more options.

How do I calculate my salary hike percentage?

To find salary after a hike: New Salary = Current Salary × (1 + Hike% ÷ 100). Example: ₹50,000 salary with a 10% hike = ₹50,000 × 1.10 = ₹55,000. To find what % increase you received: ((New − Old) ÷ Old) × 100. Use the Increase or Diff tabs above.

How do I calculate percentage marks from exam scores?

Percentage = (Marks Obtained ÷ Total Marks) × 100. Example: if you scored 450 out of 600, your percentage = (450 ÷ 600) × 100 = 75%. Use the Basic % tab: enter 100 as X and (obtained/total) as decimal, or use the Diff tab to compare two exam scores.

What is 15% of 15000?

15% of 15,000 = (15 ÷ 100) × 15,000 = 2,250. This is the default example in the Basic % tab. Common use case: calculating a 15% commission on ₹15,000 in sales, or finding a 15% tip on a ₹15,000 hotel bill.

How do I calculate percentage return on investment?

ROI% = ((Current Value − Initial Investment) ÷ Initial Investment) × 100. Example: if you invested ₹1,00,000 and your portfolio is now worth ₹1,25,000, your ROI = ((1,25,000 − 1,00,000) ÷ 1,00,000) × 100 = +25%. Use the Diff tab with initial and final values.

What is the formula for percentage change?

Percentage Change = ((New Value − Old Value) ÷ Old Value) × 100. A positive result indicates growth; negative indicates decline. This formula applies to price changes, population growth, revenue comparisons, and any before-and-after scenario. The Diff tab in this calculator computes it automatically.

Percentage Calculator - Calculate Percentages, Increases & Decreases

What is X% of Y? Enter a percentage and a value — e.g., 15% of 15,000 = 2,250

Quick Presets

Currency:

Percentage (X%)

Total Value (Y)

Step-by-Step Calculation

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Calculated Result

Percentage Value

2,250

15% of 15,000 = 2,250

Total (Y) 15,000

Remaining 12,750

Visual Breakdown

Remaining

15% Share

Related Calculators

GST Calculator Discount Calculator Salary Hike Compound Interest SIP Calculator Loan Calculator

Core Formulas

How Percentage Calculation Works

Every percentage problem boils down to four core formulas. Here is how each operates with plain-English rules and practical examples:

1 What is X% of Y?

Used for store discounts, taxes, tips, and sales commissions.

Result = (X ÷ 100) × Y

15% of 15,000 = (15 ÷ 100) × 15,000 = 2,250

2 Percentage Increase

Used for salary appraisals, price rises, and investment growth.

New = Orig × (1 + Rate ÷ 100)

Increase 1,000 by 20% = 1,000 × 1.20 = 1,200

3 Percentage Decrease

Used for sale discounts, EMI reduction, and asset depreciation.

New = Orig × (1 − Rate ÷ 100)

Decrease 5,000 by 12% = 5,000 × 0.88 = 4,400

4 Percentage Change

Used for year-over-year metrics, exam score shifts, and stock returns.

%Δ = ((Y − X) ÷ |X|) × 100

80 → 100 = ((100 − 80) ÷ 80) × 100 = +25%

Percentage Increase Calculator

Computes new value after a percentage rise: New = Original × (1 + Rate/100). Standard for appraisals (₹50k + 10% = ₹55k), GST addition, and compound capital expansion.

Percentage Decrease Calculator

Determines reduced value after percentage markdowns: New = Original × (1 − Rate/100). Ideal for flash sale prices (₹5k at 12% off = ₹4.4k) and vehicle depreciation.

Percentage Change Calculator

Measures relative variation between initial and final values: ((Final − Initial) / |Initial|) × 100. Evaluates performance shifts in test marks, business revenues, or share prices.

Quick Reference

Common Percentage Calculation Examples

Problem	Formula / Method	Result
What is 15% of 15,000?	(15 ÷ 100) × 15,000	2,250
Increase 1,000 by 20%	1,000 × 1.20	1,200
Decrease 5,000 by 12%	5,000 × 0.88	4,400
% change: 80 → 100	((100−80) ÷ \|80\|) × 100	+25%
2,250 is 15% of what?	2,250 ÷ 0.15	15,000
What is 18% GST on ₹2,500?	(18 ÷ 100) × 2,500	₹450
30% off ₹1,200	1,200 × 0.70	₹840
10% salary hike on ₹50,000	50,000 × 1.10	₹55,000
Score: 72 out of 90	(72 ÷ 90) × 100	80%
Markup: cost ₹800, sell ₹1,000	(200 ÷ 800) × 100	25% Markup

Practical Application

Real-Life Percentage Use Cases

Discounts & Sales

Use Percentage Decrease to find final cart costs after markdown discounts. E.g. 25% off ₹3,200 = ₹2,400.

Try Discount Calculator →

GST Calculations

Add 5%, 12%, 18%, or 28% GST to any base quotation using Basic %. E.g. 18% GST on ₹10,000 = ₹1,800.

Try GST Calculator →

Salary Hikes

Use Percentage Increase to compute monthly revision after appraisals. E.g. ₹40,000 + 15% = ₹46,000.

Try Salary Calculator →

Exam Scores

Convert absolute test marks into percentage: (Marks ÷ Max Marks) × 100. E.g. 450 ÷ 600 = 75%.

Standard academic evaluation

Profit Margins

Use Margin/Markup tab to distinguish gross profit on cost vs. selling price for pricing decisions.

Retail & wholesale pricing

Investment Returns

Compare capital growth over holding periods. E.g. ₹1,00,000 to ₹1,25,000 = +25% return.

Try SIP Calculator →

All calculations are performed locally in your browser. Results are mathematical estimates for reference purposes only.

Percentage Result