Percentage calculator

The three percentage sums people actually search for - discount maths, marks and score checks, and price or salary changes. Everything runs in this tab; nothing is uploaded.

What is X% of Y?

Discounts, tips, tax shares.

Percent (X)Of number (Y)

X is what % of Y?

Marks out of total, progress.

Part (X)Out of (Y)

Percentage change

Price rise, salary hike, drops.

From (old value)To (new value)

How the sums work: X% of Y = X x Y / 100. "What percent" = part / whole x 100. Change = (new - old) / old x 100 - a negative answer means a decrease. Results are rounded to two decimals; the underlying calculation keeps full precision. Your numbers never leave this browser tab.