Can I enter negative numbers?
Yes. Negative amounts work for change calculations and for scenarios such as refunds or debt reductions.
Step-by-step walkthrough
Percentage 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.
- percent
- change
- whole
- part
Detailed procedure
Step 1
Choose the mode that matches your question (Part, Whole, Percent, or Change).
Step 2
Fill in the known values in the input fields that appear.
Step 3
Read the solved value in the results stack immediately below the inputs.
Teaching & troubleshooting tips
How is percent change different from percent of?
Percent change compares an old value to a new value and reports the relative difference, while percent of answers “X is what percent of Y.”