Percentage Calculator

Three modes: percent of a number, share of a total, and change rate.

① X% of Y

② X is what % of Y

③ Change from X to Y

Percentage formulas

X% of Y = Y × X ÷ 100 X is what % of Y = X ÷ Y × 100% Change X→Y = (Y − X) ÷ X × 100%

FAQ

How do I calculate percentage change?

Change % = (New − Original) ÷ Original × 100%. Example: 100 → 130 is +30%; 130 → 100 is −23.1% (the base differs, so up and down are not symmetric).