折扣計算器

How to use

1. Enter the original (full) price of the item.
2. Enter the discount percentage (e.g., 20 for 20% off).
3. The sale price and savings appear instantly — no button needed.

Related tools

• Sale vs Coupon Comparison
• Price Per Unit Comparator
• Bulk Buy Savings Calculator
• Percentage Calculator

常見問題

Is this discount calculator free?

Yes, completely free with no signup required.

Does my data leave my device?

No. All calculations happen in your browser — nothing is sent to a server.

Does it work on mobile?

Yes. The tool is mobile-first and works on any modern browser including iPhone Safari and Android Chrome.