Choosing the right size is one of the first decisions to make when ordering custom challenge coins, medals, police badges, military badges, metal badges, lapel pins, and keyrings.
Size affects much more than appearance. It also influences weight, readability, 3D detail, enamel area, manufacturing cost, attachment hardware, packaging, and how the finished product feels in the hand.
A 25 mm lapel pin and a 50 mm challenge coin may use similar artwork, but they require very different design strategies.
There is no universal “best size.” The right size depends on application, artwork, wearing method, target audience, quantity, and budget.
Quick Size Comparison
| Product | Common Size Range | Best For |
|---|---|---|
| Challenge Coin | 30–60 mm | Recognition, military, police, corporate |
| Medal | 40–80+ mm | Sports, awards, commemorative events |
| Police Badge | 50–80+ mm | Uniform and commemorative applications |
| Military Badge | 25–70 mm | Insignia, uniforms, recognition |
| Metal Badge | 20–70 mm | Corporate, security, organizations |
| Lapel Pin | 15–40 mm | Branding, events, recognition |
| Keyring | 30–60 mm | Promotional and everyday use |
Important: These are practical manufacturing ranges, not universal industry standards. Official police, military, or organizational insignia may have their own required dimensions.
1. Why Size Matters for Custom Metal Products
A change of only 5–10 mm can significantly affect the final product.
For example, increasing a round challenge coin from 40 mm to 50 mm increases its face area according to:
Area = π × radius²
40 mm coin:
π × 20² ≈ 1,257 mm²
50 mm coin:
π × 25² ≈ 1,963 mm²
That means the 50 mm coin has approximately 56% more surface area than the 40 mm coin.
This additional space can be used for:
- Larger text
- More detailed artwork
- Additional enamel
- Deeper 3D relief
- Larger logos
- More decorative elements
However, the larger coin will generally require more material and may weigh considerably more.
2. Challenge Coin Size Guide
Challenge coins are among the most size-sensitive custom metal products.
Common sizes include:
30–35 mm
Best for:
- Small recognition coins
- Pocket-friendly designs
- Simple logos
- Minimalist products
38–42 mm
A practical size for:
- Corporate challenge coins
- Police coins
- Organization coins
- Military unit coins
45–50 mm
A popular range for:
- Military challenge coins
- Firefighter coins
- Police recognition coins
- Commemorative coins
- Detailed double-sided designs
55–60 mm+
Best for:
- Large presentation coins
- Complex 3D designs
- Highly detailed commemorative coins
- Premium display pieces
3. What Is the Most Popular Challenge Coin Size?
There is no single official standard.
However, approximately 38–50 mm is a practical range for many custom challenge coin projects.
A 45 mm coin often provides a useful balance between:
- Hand feel
- Artwork area
- Weight
- Readability
- Production cost
- Portability
For simple logos, 38–42 mm may be enough.
For detailed 3D designs, 45–50 mm can provide significantly more room.
4. How Big Should a Military Challenge Coin Be?
For a military challenge coin, approximately 40–50 mm is often a practical starting point.
If the coin contains:
- Unit crest
- Eagle
- Aircraft
- Vehicle
- Multiple inscriptions
- Date
- Motto
- 3D relief
then 45–50 mm may be more appropriate.
For a simple unit logo with limited text, a smaller coin can work well.
The important point is to design the artwork according to the final physical size.
5. Challenge Coin Thickness
Diameter is only one part of the specification.
Common custom challenge coin thicknesses include approximately:
- 1.5–2 mm: lightweight
- 2–3 mm: standard range for many designs
- 3–4 mm: substantial/premium feel
- 4 mm+: heavy or specialty designs
Thickness affects:
- Weight
- Edge appearance
- Durability
- 3D relief
- Perceived quality
- Shipping cost
A 50 mm coin that is only 1.5 mm thick feels completely different from a 50 mm coin that is 4 mm thick.
6. How Size Affects Challenge Coin Weight
The relationship is important.
If diameter increases while thickness and material remain the same, metal volume increases approximately with the square of the diameter for a simple circular coin.
For example, comparing 40 mm and 50 mm:
50² ÷ 40² = 1.5625
So the theoretical metal volume can be approximately 56% greater, assuming the same thickness and a simple solid shape.
Actual weight will vary because custom coins often contain:
- Recessed areas
- 3D relief
- Cut-outs
- Edge designs
- Different thicknesses
- Different base metals
This is why a manufacturer should calculate the actual product weight rather than estimating it only from diameter.
7. Custom Medal Size Guide
Medals generally need more visual presence than lapel pins.
Common medal diameters include:
40 mm
45 mm
50 mm
55 mm
60 mm
70 mm
80 mm+
The appropriate size depends heavily on the event.
8. Best Medal Size for Running Events
For running medals, 50–70 mm can provide enough room for:
- Event logo
- Runner
- Race name
- Year
- Distance
- City
- Decorative elements
A 60 mm medal can provide a strong visual presence without becoming excessively large.
For a simple school running event, 45–55 mm may be sufficient.
For a major commemorative race, 60–80 mm can create a stronger presentation piece.
9. Best Medal Size for Soccer Tournaments
Soccer medals often use approximately:
50–70 mm
because the artwork may contain:
- Soccer ball
- Player
- Tournament logo
- Team name
- Year
- Championship text
A custom soccer medal can also use a football-shaped or shield-shaped silhouette rather than a circular design.
The final dimensions should be measured at the widest and tallest points.
10. Medal Thickness Guide
Typical custom medal thicknesses can range from approximately:
2–5 mm
depending on design and manufacturing method.
For 3D medals, additional thickness or relief depth may be needed.
A large 70 mm medal with deep 3D relief requires different engineering from a simple 45 mm flat medal.
11. Police Badge Size Guide
Police badges are more sensitive to size because official designs may be governed by organizational specifications.
For commemorative or custom police-style badges, approximately:
50–80 mm
can be a practical design range.
The final size depends on:
- Shield shape
- Eagle
- Badge number
- Department name
- Rank
- Attachment
- Uniform placement
For official police insignia, always follow the relevant department’s approved dimensions rather than relying on a general manufacturer recommendation.
12. Military Badge Size Guide
Military badges can vary significantly depending on the application.
Common custom badge sizes may fall within:
25–70 mm
Small insignia may need to remain compact for uniform use.
Larger commemorative or presentation badges can be significantly bigger.
The main challenge is maintaining:
Text + Symbol + Relief + Recognition
within the available area.
13. Metal Badge Size Guide
“Metal badge” includes a huge range of products.
Small: 20–30 mm
Best for:
- Corporate logos
- Small lapel badges
- Minimalist branding
Medium: 30–50 mm
Best for:
- Organization badges
- Security badges
- Corporate identification
- Event badges
Large: 50–70+ mm
Best for:
- Large emblems
- Commemorative badges
- Detailed 3D products
- Display products
14. Lapel Pin Size Guide
Lapel pins are usually smaller than challenge coins and medals.
Common sizes include:
15–20 mm
Best for:
- Minimal logos
- Small brand marks
- Subtle corporate pins
20–25 mm
Best for:
- Corporate logos
- Organizations
- Clubs
- Event pins
25–30 mm
One of the most versatile ranges for:
- Promotional pins
- Recognition pins
- School organizations
- Corporate branding
30–40 mm
Best for:
- Detailed logos
- Character designs
- Large event pins
- More complex enamel artwork
15. How Big Should a Custom Lapel Pin Be?
For many corporate or organizational applications, 20–30 mm is a practical starting point.
If the logo is simple, 20–25 mm can look clean and professional.
If the design contains:
- Multiple colors
- Text
- Detailed symbols
- Complex outlines
consider increasing the size to 30–35 mm.
16. Why Small Lapel Pins Can Be Difficult to Manufacture
Suppose the pin is only 20 mm wide.
A logo might contain:
- 8 letters
- 3 decorative lines
- 4 colors
- A detailed icon
At that scale, the details may become difficult to reproduce.
Increasing the pin to 30 mm increases the overall linear dimensions by 50%, providing significantly more physical space for the artwork.
This is why manufacturers often recommend simplifying small designs.
17. Keyring Size Guide
Custom keyrings commonly fall around:
30–60 mm
but can be larger depending on the application.
30–40 mm
Best for:
- Small logo keyrings
- Promotional products
- Lightweight everyday use
40–50 mm
A practical range for:
- Corporate keyrings
- Organization keyrings
- Sports teams
- Souvenir products
50–60+ mm
Best for:
- Detailed 3D designs
- Character keyrings
- Large logos
- Functional keyrings
Remember that the hardware adds additional length.
A 50 mm metal design attached to a split ring may have a total finished length of 65–80 mm or more.
18. Keyring Size Is Not Just the Metal Part
When specifying a keyring, measure:
Metal body + connector + ring
rather than only the metal emblem.
For example:
Metal body: 45 mm
Connector: 10 mm
Split ring: 25 mm
The total assembled product can be substantially longer.
This matters for:
- Packaging
- Shipping
- Display cards
- Retail packaging
- Pocket comfort
19. Size Guide by Application
| Application | Recommended Starting Size |
|---|---|
| Military Challenge Coin | 40–50 mm |
| Police Challenge Coin | 40–50 mm |
| Firefighter Challenge Coin | 40–50 mm |
| Corporate Challenge Coin | 38–50 mm |
| Commemorative Coin | 45–60 mm |
| Running Medal | 50–70 mm |
| Soccer Medal | 50–70 mm |
| Corporate Medal | 45–65 mm |
| Commemorative Badge | 40–70 mm |
| Lapel Pin | 20–30 mm |
| Small Logo Pin | 15–25 mm |
| Custom Keyring | 30–60 mm |
These are starting points rather than fixed standards.
20. Size vs. Detail: A Simple Rule
One of the easiest ways to choose the size is:
Simple design → Smaller product
Complex design → Larger product
For example:
Simple Logo
25 mm lapel pin
Logo + Text
30 mm lapel pin
Detailed Character
35–40 mm lapel pin
3D Eagle + Text + Date
45–50 mm challenge coin
Large 3D Sports Scene
60–80 mm medal
21. Size vs. Enamel
Size also affects enamel design.
Small Product
Use:
- Fewer colors
- Larger color areas
- Thicker metal lines
- Simple shapes
Large Product
You can use:
- More color sections
- Larger text
- More complicated artwork
- Multiple relief levels
For example, a 20 mm soft enamel pin may need a simplified logo, while a 50 mm challenge coin can accommodate much more detail.
22. Size vs. 3D Relief
3D manufacturing requires sufficient physical space.
A complex 3D eagle on a 25 mm badge may not reproduce the same detail as a 50 mm coin.
Larger products allow engineers more room for:
- Relief transitions
- Facial details
- Feathers
- Clothing
- Mechanical components
- Sculpted backgrounds
For detailed 3D designs, size should be discussed with the manufacturer before final artwork approval.
23. Size vs. Text
Text is often the limiting factor.
If the customer insists on:
Long organization name + motto + date + location
a 25 mm product may simply be too small.
There are three solutions:
- Increase the product size
- Reduce the amount of text
- Simplify the font
Increasing the size is usually the best solution when the text is essential.
24. Size vs. Cost
Larger products normally require more material.
This can affect:
- Material cost
- Plating cost
- Enamel cost
- Packaging
- Shipping weight
But size does not always increase the price proportionally.
A 50 mm coin is not necessarily 25% more expensive than a 40 mm coin because manufacturing costs include:
- Tooling
- Labor
- Finishing
- Packaging
- Quantity
- Engineering
The final quotation must therefore be based on the complete specification.
25. Size vs. Shipping
For large orders, weight can affect shipping costs.
Consider two projects:
Project A
1,000 × 30 mm lapel pins
Project B
1,000 × 60 mm medals
Even if both contain 1,000 pieces, the second order may have significantly greater:
- Metal weight
- Packaging volume
- Carton weight
- Freight cost
This is important for international OEM orders.
26. How to Specify Dimensions Correctly
A good product specification should include:
Width
Height
Thickness
Relief depth
Attachment dimensions
For irregular products, provide:
Maximum width × maximum height
For example:
Custom Keyring: 48 × 35 mm, 3 mm thick
rather than simply saying:
48 mm
This prevents confusion.
27. Round vs. Irregular Shapes
For a circular coin:
Diameter is sufficient.
For a rectangular badge:
Width × height
For an irregular badge:
Maximum width × maximum height
For a keyring:
Metal body width × height + total assembled length
For a medal:
Medal diameter + thickness + ribbon width/length
28. How to Choose the Right Size in 5 Steps
Step 1: Identify the Application
Is it:
- Recognition?
- Promotion?
- Uniform use?
- Sports?
- Commemoration?
- Retail?
Step 2: Review the Artwork
Is the design simple or detailed?
Step 3: Select the Approximate Size
Choose a starting range.
Step 4: Check the Artwork at Actual Size
Print it at 100% scale.
Step 5: Request a Digital Proof
Ask the manufacturer to confirm:
- Text
- Relief
- Enamel
- Dimensions
- Hardware
- Overall proportions
29. Study Case: 25 mm vs. 35 mm Lapel Pin
A company wants a custom logo pin.
The original artwork contains:
- Company logo
- Company name
- Two colors
- Small slogan
Option A — 25 mm
The logo works, but the slogan is difficult to read.
Option B — 35 mm
The logo and company name become much clearer.
The additional 10 mm provides considerably more physical space.
Recommendation
For branding where readability matters, 35 mm is the better choice.
For a minimalist logo without text, 25 mm may be sufficient.
30. Study Case: 40 mm vs. 50 mm Challenge Coin
A military organization wants a double-sided coin.
Artwork includes:
- Eagle
- Unit emblem
- Unit name
- Motto
- Date
- 3D relief
- Three enamel colors
40 mm
The design is possible, but text and fine details need to be simplified.
50 mm
The additional surface area makes:
- Text larger
- 3D elements clearer
- Enamel areas larger
- Artwork easier to balance
Recommendation
50 mm is the stronger choice for this particular design.
31. Study Case: 50 mm vs. 70 mm Sports Medal
A marathon organizer wants a custom medal.
50 mm
Advantages:
- Lightweight
- Lower material consumption
- Easy to package
- Lower shipping weight
70 mm
Advantages:
- Stronger visual presence
- More room for artwork
- Larger event logo
- Better opportunity for 3D relief
If the medal is intended to become a major event keepsake, 60–70 mm may provide better perceived value.
32. Quality Control for Product Dimensions
A professional manufacturing process should verify:
Size
- Width
- Height
- Diameter
- Thickness
Structure
- Relief depth
- Hole position
- Attachment position
- Edge profile
Surface
- Plating
- Enamel
- Polishing
- Scratches
- Deformation
Assembly
- Clutch
- Pin
- Ring
- Ribbon
- Chain
For large OEM orders, dimensional consistency is particularly important.
33. Frequently Asked Questions
What is the standard size of a challenge coin?
There is no single universal standard. Approximately 38–50 mm is a practical range for many custom challenge coins.
What is the most popular challenge coin size?
Approximately 45 mm is a useful starting point for many designs because it balances portability, artwork area, and weight.
Is a 50 mm challenge coin too big?
Not necessarily. A 50 mm coin is appropriate when the artwork is detailed or the product is intended as a premium commemorative piece.
What is the best size for a military challenge coin?
Approximately 40–50 mm is a practical starting range. Complex 3D designs may benefit from the larger end of the range.
What is the best size for a police challenge coin?
Approximately 40–50 mm works well for many designs, although individual organizations may specify different requirements.
What size should a custom medal be?
Approximately 50–70 mm works well for many sports and commemorative medals.
What is the best size for a running medal?
Around 50–70 mm is a practical starting point, depending on artwork and event positioning.
How big should a soccer medal be?
Approximately 50–70 mm provides enough room for a soccer ball, player, event name, and year.
What is the best size for a lapel pin?
For many corporate and organization pins, 20–30 mm is a practical range.
Is 20 mm too small for a lapel pin?
Not necessarily. A simple logo can work very well at 20 mm. Detailed artwork or long text may require a larger pin.
Is 40 mm too large for a lapel pin?
It can be large for everyday corporate wear, but it can work for promotional events, character designs, and highly detailed logos.
What is the best size for a custom keyring?
Approximately 30–60 mm is a practical range, depending on the shape and intended use.
How is an irregular badge measured?
Use the maximum width × maximum height of the finished metal shape.
Does a larger coin always cost more?
Generally, more metal and finishing may increase the cost, but tooling, quantity, design complexity, plating, enamel, and labor also affect the final price.
Does a larger coin weigh more?
Usually yes if thickness and material remain similar. However, cut-outs, recessed areas, 3D relief, and different materials can significantly change the final weight.
Does size affect enamel?
Yes. Larger products provide more space for enamel areas and text. Smaller products require simpler artwork.
Does size affect 3D detail?
Yes. Larger products generally provide more room for complex sculptural relief.
Can I use the same artwork for a 25 mm pin and a 50 mm coin?
You can use the same basic concept, but the artwork often needs to be redrawn or simplified for the smaller product.
Can you manufacture a custom size?
Yes. Custom dimensions and shapes can generally be developed according to the artwork and manufacturing requirements.
What information should I provide for a quotation?
Provide:
- Product type
- Width/diameter
- Height
- Thickness
- Quantity
- Material
- 2D or 3D
- Soft or hard enamel
- Plating
- Attachment
- Packaging
- Artwork
Should I choose size before or after the artwork?
Choose an approximate size before finalizing the artwork. The artwork should then be developed specifically for the selected physical dimensions.
What happens if my text is too small?
The manufacturer may recommend increasing the product size, shortening the text, changing the font, or simplifying the artwork.
Is a thicker medal better?
Not automatically. Thickness should match the medal’s size, weight, design, relief, and intended application.
What size is best for a premium challenge coin?
A 45–50 mm coin with suitable thickness and a carefully designed finish can provide a strong premium feel.
What size is best for promotional lapel pins?
Approximately 20–30 mm is often a practical starting range, particularly when the logo is relatively simple.
What size is best for 3D keyrings?
Approximately 40–60 mm can provide sufficient space for complex 3D artwork while remaining practical for everyday use.
ChallengeCoinBadges Custom Manufacturing
ChallengeCoinBadges provides OEM and custom manufacturing for challenge coins, medals, police badges, military badges, metal badges, lapel pins, keyrings, and other custom metal products.
The production team can evaluate your artwork and recommend an appropriate combination of:
Size + Thickness + Material + 2D/3D Relief + Enamel + Plating + Hardware
The goal is not simply to make the product larger or smaller. The objective is to find the smallest practical size that reproduces the artwork clearly while providing the desired appearance, weight, and cost.
Website: www.challengecoinbadges.com
Email: sales@challengecoinbadges.com
Final Size Selection Guide
If you need a quick starting point:
| Product | Recommended Starting Point |
|---|---|
| Military Challenge Coin | 45–50 mm |
| Police Challenge Coin | 40–50 mm |
| Corporate Challenge Coin | 38–45 mm |
| 3D Challenge Coin | 45–55 mm |
| Running Medal | 50–70 mm |
| Soccer Medal | 50–70 mm |
| Commemorative Medal | 55–75 mm |
| Police Badge | 50–80 mm* |
| Military Badge | 25–70 mm* |
| Corporate Metal Badge | 25–50 mm |
| Lapel Pin | 20–30 mm |
| Detailed Lapel Pin | 30–40 mm |
| Custom Keyring | 30–60 mm |
*Official police and military insignia may have organization-specific size requirements.
The simplest rule to remember:
Small logo → Small product
Long text → Larger product
Complex 3D design → Larger product
Premium presentation → Larger and/or thicker product
Budget production → Optimize size instead of simply making it larger
The best custom metal product is not necessarily the biggest one. The best size is the one that gives the artwork enough room to remain clear while keeping weight, cost, and usability under control.