Algebra
Percentage Difference Calculator
Find the % difference between two values. Calculate the absolute percentage difference between two numbers and distinguish it from percentage change.
Examples:
Formula Reference
Linear Equation
ax + b = c → x = (c−b)/a
Quadratic Formula
x = (−b ± √(b²−4ac)) / 2a
Discriminant
Δ = b² − 4ac
Vertex Form
y = a(x−h)² + k
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Solution Methodology
01
Enter Both Values
Input V1 and V2 — the order does not affect percentage difference.
02
Compute Absolute Difference
Calculate |V1 − V2| as the numerator.
03
Divide by Average & Scale
Divide by (V1+V2)/2 and multiply by 100 to express as a percentage.
Common Questions
What is the formula for percentage difference?
Percentage Difference = |V1 − V2| / ((V1 + V2) / 2) × 100%. The denominator uses the mean of both values as a neutral reference, making the result the same regardless of which value you label V1 or V2.
How is percentage difference different from percentage change?
Percentage change = (New − Old) / Old × 100% and is directional — it depends on which value is "old". Percentage difference is symmetric and used when comparing two values without a clear before/after relationship, such as two experimental measurements.