Percentage Calculator

% Basic Percentage

What is X% of Y?

X is what % of Y?

X is Y% of what?

Formula: (X / 100) × Y

Percentage (X)

Number (Y)

Result

∆ Percentage Change

Formula: ((New - Old) / |Old|) × 100

Original Value

New Value

Percentage Change

↕ Percentage Increase / Decrease

Increase

Decrease

Formula: Value × (1 + Pct/100)

Value

Percentage

After Increase

↺ Reverse: Find Original Value

If a value is the result after a percentage increase/decrease, what was the original?

Final Value

Percentage Applied

Original Value

🏷 Discount Calculator

Original Price

Discount %

Add a second discount (stacked)

Add tax

🍵 Tip Calculator

Bill Amount

Quick Tip %

10%

15%

18%

20%

25%

Custom Tip %

Split Between

Round total up to nearest dollar

∶ Ratio & Proportion

Ratio to %

% to Ratio

Fraction to %

Proportion Solver

Ratio A:B => A/(A+B) × 100

Percentage => simplify to ratio

Percentage

Fraction => (Numerator / Denominator) × 100

Numerator

Denominator

A / B = C / D -- leave one blank to solve

Result

📚 Common Percentages

Percent	Fraction	Decimal
10%	1/10	0.1
20%	1/5	0.2
25%	1/4	0.25
33.3%	1/3	0.333
50%	1/2	0.5
66.7%	2/3	0.667
75%	3/4	0.75
100%	1/1	1.0

⚡ Quick Tricks

To find 10%: divide by 10.

To find 5%: find 10%, then halve it.

To find 15%: find 10% + 5%.

To find 25%: divide by 4.

To find 1%: divide by 100.

Reverse %: X% of Y = Y% of X. (e.g. 8% of 25 = 25% of 8 = 2)

📈 Fraction Equivalents

Fraction	Percentage
1/8	12.5%
1/6	16.67%
1/5	20%
1/4	25%
1/3	33.33%
3/8	37.5%
2/5	40%
1/2	50%
3/5	60%
5/8	62.5%
2/3	66.67%
3/4	75%
4/5	80%
5/6	83.33%
7/8	87.5%