Online Auction Calculator

Auction Math Made Simple

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

Know the real cost before you bid. Calculate buyer’s premium, tax, fees, and shipping. Unlock foreign auctions with live exchange rates and tariff estimates. Know your real auction cost before you bid. Auction Calculator is a fast, simple tool that shows the true cost of winning an auction — before buyer’s premium, tax, shipping, and card fees turn a good deal into a bad one. Domestic U.S. Auctions • Buyer’s premium calculations • Sales tax estimates • Shipping & handling • Credit card / PayPal fees Foreign & International Auctions (One-time $3.99 unlock) • Real-time foreign exchange rates • Automatic USD conversion • Import tariff estimates • Avoid surprise fees from FedEx, DHL, and UPS • Supports EUR, GBP, JPY, CAD, AUD, CHF, and more Designed for collectors who bid seriously — coins, antiques, art, and collectibles — and want clear numbers without subscriptions or ads. No advertising. No tracking. No subscriptions. One app. One purchase. Total transparency.

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- Updated iPad format - Updated screenshots - Ui/ux tweaks

Version 1.4

The developer, James Kirwin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • James Kirwin
    Size
    • 7.7 MB
    Category
    • Finance
    Compatibility
    Requires iOS 26.0 or later.
    • iPhone
      Requires iOS 26.0 or later.
    • iPad
      Requires iPadOS 26.0 or later.
    • Mac
      Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.0 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 by SPQR Developers
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More

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