Percentage Calculator
Effortless percentage formulas for shopping, grades, and analysis.
Percentage Calculator
Compute portions, fractional shares, and relative delta fluctuations.
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What This Calculator Does
The Percentage Calculator solves the three most common percentage problems in one tool: finding a percentage of a number, determining what percentage one number is of another, and computing the percentage increase or decrease between two values. It is built for shoppers checking discounts, students grading work, and analysts comparing figures.
How It Works
Percentage problems reduce to three formulas. A portion is computed as (rate / 100) x base. A share of a total is (part / total) x 100. A delta is ((new - old) / |old|) x 100, where a positive result signals an increase and a negative result a decrease.
Example
You want 15% of 240. The calculator computes (15 / 100) x 240 = 36. Enter 45 and 180 to see that 45 is exactly 25% of 180, and enter 80 then 100 to see a 25% increase.
Formula
Part = (Rate / 100) × BaseRate is the percent, Base is the whole.
Share = (Part / Total) × 100Change = ((New − Old) / |Old|) × 100Positive means increase, negative means decrease.
Reading the Results
Percent of Value
The exact portion of the base number represented by the percentage rate. For 15% of 240 it returns 36.
Percent Change
How much a value grew or shrank relative to its starting point, expressed as a percentage.
Frequently Asked Questions
How do I find what percent one number is of another?
Divide the part by the total and multiply by 100. For example, 45 is 45 / 180 x 100 = 25% of 180.
How do I calculate a percentage increase?
Subtract the original value from the new value, divide by the original value, and multiply by 100. A rise from 80 to 100 is a 25% increase.
Can this calculator work with negative deltas?
Yes. When the final value is lower than the initial value, the calculator reports a negative percentage, shown as a decrease.