The American Silver Eagle is one of the world’s most recognizable and widely traded bullion coins. Its specifications are worth knowing whether you buy Silver Eagles as an investment, collect them by date, or simply want to confirm that a coin in hand is genuine. The exact weight, dimensions, and silver content are what let you authenticate a coin, compare it against other bullion, and calculate its melt value.
This guide is a complete reference for those numbers, from weight and diameter to composition and the designers behind each side of the coin.
Complete American Silver Eagle Specifications
Below is a full breakdown of the official specifications published by the U.S. Mint.
| Specification | Value |
|---|---|
| Total Weight | 31.103 grams (1.000 troy ounce) |
| Silver Content | 1.000 troy ounce of .999 fine silver |
| Diameter | 40.6 mm (1.598 inches) |
| Thickness | 2.98 mm (0.117 inches) |
| Fineness | .999 fine silver (99.9% pure) |
| Face Value | $1 USD (legal tender) |
| Edge Type | Reeded (Type 2 coins, 2021–present, carry a security “reed variation,” the so-called edge notch) |
| Obverse Designer | Adolph A. Weinman (Walking Liberty, adapted from the 1916 half dollar) |
| Reverse Designer | John Mercanti (Type 1, 1986–2021); Emily Damstra (Type 2, 2021–present) |
| Mint Marks | None (bullion); W (West Point, proof and burnished); S (San Francisco, proof); P (Philadelphia, rare — 2020 emergency issue) |
Weight and silver content
The American Silver Eagle weighs 31.103 grams, equal to one troy ounce, and is struck from .999 fine silver. The U.S. Mint guarantees that each coin contains one full troy ounce of pure silver, which is what makes the Eagle so simple to value: one coin equals one troy ounce of .999 silver, regardless of date, type, or mint mark.
That consistency is why the Silver Eagle is a favorite for calculating melt value. There is no fractional silver weight to look up and no fineness adjustment to make, unlike 90% “junk” silver or clad issues.
Size and portability
At 40.6 mm in diameter, the Silver Eagle is larger across than most other one-ounce silver coins. The extra width gives it a strong visual presence and makes it easy to recognize, though it also takes a little more room to store than a Canadian Maple Leaf (38 mm) or Austrian Philharmonic (37 mm). At 2.98 mm thick, the coin itself is fairly slim and stacks neatly in standard coin tubes and capsules. Many dealers offer them in mint sealed tube of 20 coins for convenient storage.
How Silver Eagle Specifications Compare to Other Sovereign Coins
The Silver Eagle is one of several government-issued, one-ounce silver bullion coins. Here is how its specifications line up against the other major sovereign issues.
| Coin | Weight | Fineness | Diameter | Silver oz |
|---|---|---|---|---|
| American Silver Eagle | 31.103 g | .999 | 40.6 mm | 1.000 |
| Canadian Maple Leaf | 31.10 g | .9999 | 38 mm | 1.000 |
| British Britannia | 31.21 g | .999 | 38.61 mm | 1.000 |
| Austrian Philharmonic | 31.10 g | .999 | 37 mm | 1.000 |
| South African Krugerrand | 31.10 g | .999 | 38.7 mm | 1.000 |
| Mexican Libertad | 31.10 g | .999 | 40 mm | 1.000 |
A few things stand out. The Silver Eagle has the widest diameter of the group at 40.6 mm, which is part of why it is so easy to identify at a glance. The Canadian Maple Leaf carries the highest fineness at .9999, against .999 for the Eagle and most others. And although the coins vary slightly in gross weight, each one holds a full troy ounce of pure silver; the Britannia’s higher figure reflects a small amount of additional alloy, not extra silver.
Using Specifications to Authenticate Your American Silver Eagle
Knowing the exact numbers is the simplest way to screen for counterfeits. A few basic checks catch most fakes.
Weight. Use a digital scale accurate to 0.01 grams. A genuine Silver Eagle weighs about 31.10 to 31.11 grams. Counterfeits made from base metal usually come in noticeably light or heavy because no substitute matches silver’s density.
Diameter. Measure edge to edge with digital calipers. A real coin is 40.6 mm across. This is one of the more reliable checks, since fakes often miss the exact diameter.
Thickness. Measured at the rim, a genuine coin is 2.98 mm. Inconsistent or off-spec thickness is a warning sign.
Ring test. Balance the coin on a fingertip and tap it gently with another coin. Silver produces a clear, high-pitched ring that lingers; a counterfeit tends to give a dull, flat sound. This one takes practice to judge reliably.
Visual inspection. Look closely at the reeded edge. On Type 2 coins (2021 onward), the edge carries a small security notch that looks like a missing reed but is intentional. Check that fine details are crisp, especially Liberty’s hair and face on the obverse and the eagle on the reverse, and that any mint mark matches the style expected for that year and mint.
Frequently Asked Questions About Silver Eagle Specifications
How much does a Silver Eagle weigh?
An American Silver Eagle weighs 31.103 grams, which is exactly one troy ounce. For everyday purposes, one Silver Eagle equals one troy ounce of pure silver.
How much silver is in a Silver Eagle?
Each coin contains one troy ounce of .999 fine silver, guaranteed by the U.S. Mint. That holds true for every issue regardless of date, type, or mint mark, which is what makes the melt-value calculation so straightforward.
What is the diameter of a Silver Eagle?
The Silver Eagle measures 40.6 millimeters (1.598 inches) across. That makes it wider than most competing one-ounce silver coins, which generally run 37 to 39 mm, and is a big part of why the Eagle is so easy to recognize.
Related Resources
- Silver Coin Melt Value Calculator — figure the silver value of any U.S. coin at today’s spot price
- Silver Eagles vs. Silver Maple Leafs — how the two most popular one-ounce silver coins compare
- What the Edge Notch on Gold and Silver Eagles Means — the Type 2 anti-counterfeit security feature explained
- 2026 American Silver Eagle Guide — this year’s issues, pricing, and what to know before buying
- American Silver Eagle Mintages — year-by-year production figures and key dates
- Buy American Silver Eagles — compare live dealer prices on Silver Eagles
Conclusion
The Silver Eagle’s specifications are what make it such a dependable coin to own: a fixed 31.103-gram weight, a full troy ounce of .999 silver, a 40.6 mm diameter, and a design that has stayed consistent for decades. Keep these numbers handy and you can authenticate a coin, weigh it against other bullion, or work out its melt value in seconds, which is a large part of why the Silver Eagle remains America’s official silver bullion coin.
