Percentages

Quick, reliable percent calculators for everyday math.

When to use which?

  • Percentage: “What is 15% of 320?”, “80 is what % of 500?”.
  • % Difference: Compare two values symmetrically (A vs B) without a baseline order.
  • % Change: Directional change from old → new (increase or decrease).

Percentage Calculator

Solve common percent problems quickly.

of
Answer:
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Use (X / Y) × 100 = P% and variants. Decimals are allowed; avoid X=0 where division occurs.
Examples and formulas
What is P% of X?
Formula: Y = (P/100) × X. Example: 15% of 80 = 0.15 × 80 = 12.
Y is what % of X?
Formula: P% = (Y / X) × 100. Example: 12 of 80 → (12/80)×100 = 15%.
Y is P% of what?
Formula: X = Y ÷ (P/100). Example: 12 is 15% of X → 12 ÷ 0.15 = 80.

Percentage Difference

Find the percent difference between two values.

and
Answer (% difference):
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Formula: |V1 − V2| / ((V1 + V2) / 2) × 100
Example
Example: V1=5, V2=7 → |5−7| / ((5+7)/2) × 100 = 33.33%.

Percentage Change

Compute percent increase or decrease.

to
Answer (% change):
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Formula: ((new − old) / old) × 100
Example
Example: from 80 to 100 → ((100−80)/80)×100 = 25% increase.