Pi 3.14 Coin in Copper


An irrational coin

Feeling irrational? It may be a sine to take some deep breaths and trace pi's digits by hand for a calming sensory experience.

The number pi (π) is a mathematical constant, approximately equal to 3.14159. It is defined in Euclidean geometry as the ratio of a circle’s circumference to its diameter.


  • Pi coin minted in solid copper in West Fork, AR
  • Solid Copper - 29 g
  • 1.54 in (3.9 cm) diameter
  • Antiqued patina

This heavy copper coin feels good in the hand and the pocket. The copper coin blank is pre-tumbled before minting for a smooth edge and then given an antiqued finish.

Each Pi coin comes in its own wax-sealed packaging with useful and useless pi facts.

Engraved by Woody Maringer.  Learn more about our artists.

© Shire Post Mint. All rights reserved.

Customer Reviews

Based on 12 reviews
Diana M.

The copper phi coin is chunky. The number phi on the reverse is impressive!

Heri R.
Excellent 👌🏽

I am very satisfied with this Pi 3.14 Coin, it is elegant and magical. Thank you very much and congratulations

Great coin.

Wish there was a silver one available.

Jonas G.

Pi 3.14 Coin in Copper

Jason F.
The Ultimate Ratio in Your Pocket!

This copper coin is a solid presence in my pocket. It's only 1/16" thick but over 1.5" in diameter. But that's not the ratio I'm happiest about. One face of the coin has the ratio of Pi stamped in a spiral circling toward the center. Pi is theoretically infinite and the numbers on the coin get so small, they might go on forever! I might need a microscope but now I can retrieve Pi to 40 or 50 decimal points, no problem!

Each order comes packed with a handwritten envelope sealed with wax straight from Shire Post Mint! Unless changed, we will hand write the name of the person listed in the Shipping Address.

If ordering a gift or if you'd like to customize your handwritten name, please include the recipient's name in the Personalization Options field as you complete your order.

One envelope is included in your order, if you would like to purchase additional handwritten Gift Envelopes, you can find them here.

Shire Post Mint coins are struck one at a time in West Fork, Arkansas, USA using solid metals, hand-engraved designs, antique machinery and traditional coining techniques. For antiqued coins, the coloring/patina process is done by hand, and it is both an art and a science so coins will vary slightly. Our unique packaging includes a description of each coin and translations if applicable.

We collaborate with many artists to create our coins. Learn more about our artists.

You may also like

Recently viewed