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Percentage Calculator

All common percentage calculations in one place

1️⃣ What is X% of Y?

% of = 30

2️⃣ X is what percent of Y?

is what % of = 15%

3️⃣ X is Y% of what?

is % of 200

4️⃣ Percentage increase / decrease

From to = +25%

5️⃣ Add or subtract a percentage

± % = 240 / 160

Common uses

  • Shopping discounts: 30% off a $50 item → Mode 1 (what is 30% of 50)
  • Tax calculations: Adding 8.5% sales tax to a price → Mode 5 (add percentage)
  • Tip estimation: 18% tip on $45 bill → Mode 1
  • Grade calculation: Got 85/120 on a test, what's the percentage? → Mode 2
  • Investment growth: Portfolio went from $10K to $11.5K, what's the gain? → Mode 4

Formulas

  • X% of Y = (X / 100) × Y
  • X as % of Y = (X / Y) × 100
  • X is Y% of N → N = X × 100 / Y
  • % change = ((new − old) / old) × 100