Percentage, Ratio & Average Calculator
Pick what you want to calculate, then enter the numbers.
Your result will appear here after you press Calculate.
How this calculator works
X% of Y = X ÷ 100 × Y
X is what % of Y = X ÷ Y × 100
Percentage change = (B − A) ÷ |A| × 100
Ratio solve A : B = C : x gives x = B × C ÷ A
Average = sum of values ÷ count; the median is the middle value of the sorted list.
Assumptions and limits
- Ratios with decimals are simplified up to six decimal places.
This tool gives an approximate estimate from the values you enter. It is not a substitute for professional engineering design, site inspection, official quotations or applicable building regulations. See the calculator disclaimer.