Discount & Percentage Calculator

Discount Calculator Formulas

Sale Price (after discount)

Sale Price = Original Price × (1 − Discount% / 100)

Example: ₹2000 at 25% off = 2000 × 0.75 = ₹1500

Find % off (when you know both prices)

% off = ((Original − Sale) / Original) × 100

Example: Original ₹2000, sale ₹1400 → ((2000−1400)/2000) × 100 = 30% off

% of a number

X% of Y = (X / 100) × Y

Example: 20% of 500 = 0.20 × 500 = 100

Percentage change

% change = ((New − Old) / Old) × 100

If positive → increase. If negative → decrease.

When to Use Each Mode

• Discount Price — when shopping: "₹2000 with 25% off, how much do I pay?"
• What's % Off — comparing deals: "Was ₹2000, now ₹1500. What's the discount?"
• % of Number — general math: "What is 18% of ₹5000?" (e.g. tip, tax)
• % Change — comparing values over time: "My salary went from ₹50K to ₹65K, what's the raise %?"

Real-World Examples

Shopping

• Sale tag: "Flat 40% off" on ₹5000 t-shirt → You pay ₹3000, save ₹2000
• "₹1199 from ₹1999" → You're getting 40% off, saving ₹800
• "Buy 2, get 1 free" on ₹500 items → Effective 33.3% discount per piece

Salary / Career

• Old salary ₹50K, new ₹65K → 30% hike
• Asking for 25% hike on ₹40K → expect ₹50K offer
• Inflation 6%, salary hike 8% → real raise = ~2%

Finance & Tax

• 18% GST on ₹1000 = ₹180 added → total ₹1180
• 10% TDS on ₹50K rent = ₹5000 deducted
• Investment grew from ₹1L to ₹1.5L → 50% return

Frequently Asked Questions

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