About

Last updated: 2026-06-25

What Is ShopCalc

ShopCalc is a free collection of tools that helps you handle the calculations you run into most often while shopping, quickly and accurately. Check sale prices in stores and online, compare value across differently sized products, and work out import taxes and credit card installment costs - all in one place.

Operating Principles (E-E-A-T)

• Experience - Results are broken down item by item so you can use them right away in real shopping situations (list prices, bundles, import payments, card installments).
• Expertise - We use verified formulas: discount math, unit price conversion, duty and VAT calculation, and a balance-based installment fee model.
• Authoritativeness - Import de minimis thresholds and taxes are explained based on Korea Customs Service standards, with source links provided.
• Trustworthiness - We do not hide the formulas; variable values like exchange rates and fee rates are kept as editable constants, and we clearly note that results are estimates. Inputs are not collected or stored.

Data Sources

The de minimis thresholds and tax bases used for import duty calculations are grounded in the following official sources. Exchange rates and policies may change; we update to the latest values when they do.

• Korea Customs Service - import de minimis thresholds, item duty rates, customs clearance procedures
• National Tax Service (Hometax) - VAT standards

A Note on Accuracy

All ShopCalc results are estimates for reference, based on your inputs and published formulas. Import duty in particular varies with HS classification, exchange rate, and FTA applicability, and credit card installment fees can differ by issuer, membership tier, and charging method. Confirm final decisions with official authorities and businesses such as the Korea Customs Service and your card issuer.

Contact

Send suggestions or error reports to jin@zerolabskorea.com. For how we handle personal data, see the Privacy Policy.

Last updated: 2026-06-25