How is this different from percent change?
Percent change uses one value as the baseline, while percentage difference uses the average of both values so the order does not matter.
Step-by-step walkthrough
Percentage Difference Calculator Guide
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Before you start
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
- percentage difference
- comparison
- relative error
Detailed procedure
Step 1
Enter the first measurement or estimate.
Step 2
Enter the second measurement to compare against the first.
Step 3
Review the absolute difference and resulting percentage difference.
Teaching & troubleshooting tips
Can I compare negative values?
Yes. The formula uses absolute values, so negative measurements work as long as both values share the same units.