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A browser-based postage stamp combination finder tool. No data sent to server.

📘 How to Use

  1. Enter the target postage amount you need to pay.
  2. Add the stamp denominations you have on hand using the presets or custom input.
  3. Adjust the quantity for each stamp denomination in your inventory list.

Postage Stamp Combination Finder

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Postage Stamp Combination Finder｜Instantly Calculate How to Pay Insufficient Postage

This online tool helps you find the most efficient way to combine stamps to pay for a specific postage amount. If you've ever had a letter returned for "insufficient postage," simply enter the amount due and the stamps you own, and this calculator will instantly find the best combinations to make up the difference.

💡 Tool Features

  • Finds Optimal Combinations: Calculates up to 5 of the best ways to combine your stamps, prioritizing exact matches and solutions that use the fewest stamps.
  • Handles Overpayment: If an exact match is impossible, it intelligently finds combinations that slightly exceed the target amount, minimizing waste.
  • Fully Customizable Inventory: Add any stamp denomination you own, from common values to rare ones, and specify the exact quantity of each you have available.
  • Easy Results Summary: The output clearly displays the total value, the number of stamps used, and a breakdown of the combination, with a button to copy a text summary.

🧐 Frequently Asked Questions

Q. What does "insufficient postage" mean?

A. This occurs when the postage affixed to a mail item is less than the required amount for its weight, size, or destination. The postal service may return the item or require the sender or recipient to pay the remaining balance. This tool is designed to help you figure out exactly which stamps to use to pay that balance.

Q. Can I use this for currencies other than Japanese Yen (JPY)?

A. Absolutely. While the quick-add buttons feature common Japanese stamp values, the calculator itself is currency-agnostic. You can manually add any stamp denomination (e.g., 5 cents, 2 dollars, 1 euro) using the custom input field. The logic works universally with any numerical currency system.

📚 About Japanese Postage

This tool was initially designed with the Japanese postal system in mind. In Japan, if postage is short, an item is often returned or delivered with a notice for the recipient to pay the difference at the post office. The default values in this tool, such as 84 JPY (for a standard letter) and 63 JPY (for a postcard), correspond to common domestic rates. However, the powerful calculation engine is universal and can be adapted for any country's postal system by simply inputting your local stamp denominations.