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Percentage Calculator

Calculate percentages using multiple formulas instantly

What is X% of Y?
What is
% of
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X is what % of Y?
is what % of
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Percentage Change (Increase / Decrease)
From
to
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Add / Subtract Percentage
% =
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Reverse Percentage — Find Original Number

If Y is X% of some number, find that number

is
% of =
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What is Percentage Calculator?

Free percentage calculator with multiple formulas. Find X% of Y, what % is X of Y, percentage increase/decrease, and add/subtract percentage from number. Fast, accurate mathematical calculators that show step-by-step working. TekPulse's Percentage Calculator is completely free — no signup, no ads in results, and no data stored on our servers.

How to Use Percentage Calculator Online

  1. Choose the calculation type from the three tabs: "X% of Y", "X is what % of Y", or "% Change"
  2. Enter the required numbers in the input fields
  3. The result updates instantly with a clear explanation of the formula
  4. Use the percentage change calculator to find price increases, discounts, or growth rates
  5. The formula used is shown below the result so you can verify the calculation

Percentage Calculator Formula & Calculation

% of number: (P × N) ÷ 100 | What % is X of Y: (X ÷ Y) × 100 | % change: ((New − Old) ÷ Old) × 100

Common use cases with Indian examples:
• GST: 18% of ₹5,000 = (18 × 5,000) ÷ 100 = ₹900
• Salary hike: ₹50,000 → ₹58,000 = ((58,000 − 50,000) ÷ 50,000) × 100 = 16% hike
• Exam marks: 445 out of 500 = (445 ÷ 500) × 100 = 89%
• Reverse discount: ₹1,749 after 30% off → original = 1,749 ÷ 0.70 = ₹2,499

Key Factors That Affect Your Result

  1. GST calculations — Most common use in India. Remember: adding GST (forward) and removing GST (reverse/inclusive) use different formulas. Adding 18% to ₹100 = ₹118; removing 18% from ₹118 = 118 ÷ 1.18 = ₹100 (not 118 − 18% = ₹96.76).
  2. Percentage points vs percentage change — "Interest rate rose from 6% to 8%" = 2 percentage points increase, but 33.3% relative change. These are different; confusing them leads to misleading interpretations in news and finance.
  3. Exam and CGPA conversion — Most Indian universities: % = CGPA × 9.5 (Anna University, Mumbai University). Some use × 10. VTU uses a different formula. Confirm your university's specific formula before applying.
  4. EMI affordability rule — Your total EMI should not exceed 40–50% of net take-home salary (RBI guideline). On ₹50,000 take-home: max EMI ≈ ₹20,000–25,000 across all loans (home, car, personal combined).

Why Use TekPulse Percentage Calculator?

Runs Entirely in Your Browser
All five percentage calculations happen instantly with JavaScript — nothing is sent to a server
5 Percentage Formulas in One Tool
Covers X% of Y, X is what % of Y, percentage increase/decrease, add/subtract %, and reverse percentage
Live Results as You Type
Every field recalculates instantly with no submit button or page reload

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Frequently Asked Questions

Percentage of a number: (Percentage × Number) / 100. Example: 20% of 500 = (20 × 500) / 100 = 100.

Formula: (Part / Total) × 100. Example: What % is 25 of 200? = (25/200) × 100 = 12.5%.

Percentage increase = ((New Value – Old Value) / Old Value) × 100. Example: Price went from ₹100 to ₹120. Increase = (20/100) × 100 = 20%.

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