Calculate final prices, coupon savings, and sales tax or VAT.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Type the retail or list price of the product.
Input primary discount percentage, secondary extra coupon, and local sales tax / VAT rate.
See exact dollar savings, pre-tax discounted subtotal, and final checkout amount.
Stacked discounts apply sequentially (the second discount is deducted from the already reduced price, not added together).
Yes, enter final price and discount rate to discover the original starting price.
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