Free, lightweight web tool for calculating percentage decreases — useful for discounts, budgeting, and quick analysis.
The Percentage Decrease Calculator was built to make one common math task immediate and mistake-free:
find how much a value has fallen, expressed as a percentage of its original amount.
Enter an original (starting) value and a final (after) value, click Calculate, and the result appears instantly.
Why this tool exists
Many people repeatedly compute percent changes by hand or with spreadsheets. This site gives a clean, no-friction UI
for getting a reliable answer in seconds — no sign-up, no tracking, no ads.
How it works (formula)
Percentage Decrease = ((Original Value - Final Value) / Original Value) × 100
Example: $200 → $150 gives 25% decrease.
Common uses
Calculate discounts and savings
Quick budget or expense comparisons
Business / sales drop analysis
How to use
Enter the Starting Value.
Enter the Final Value.
Click Calculate to see the percentage decrease.
Click Reset to clear inputs and start again.
Mission & Privacy
This site is intentionally tiny and privacy-friendly: no account is required, no analytics are collected, and it remains
free for everyone to use. The project's goal is to provide quick utilities that are easy to understand and reuse.