How to Measure Your Gear for Custom Foam Inserts
Why Accurate Measurements Matter
Custom foam is only as good as the measurements it's based on. Too tight and items won't fit or are difficult to remove. Too loose and items shift during transport. Getting measurements right the first time saves money and frustration.
The Easy Way: Use AI
Before we dive into manual measuring, know that CutMyCase's AI design tool eliminates most measurement work. Upload a photo of your gear and our computer vision generates precise outlines automatically. For most users, this is faster and more accurate than manual measuring.
But if you need to measure manually — or want to verify AI-generated dimensions — here's how to do it properly.
Tools You Need
- Digital calipers — for precise measurements (accuracy to 0.01 inches)
- Tape measure — for larger items
- Paper and pen — for sketching profiles
- Flat surface — for consistent measurements
Measuring Basics
Length and Width
Measure the maximum extent of each dimension. For a camera, this means measuring with the lens cap on, battery grip attached, and any protruding elements included.
Key principle: Measure the item exactly as it will sit in the foam. If you transport a camera with a lens attached, measure the combined assembly.
Height (Depth)
Measure from the surface the item sits on to its highest point. This determines how deep the foam cavity needs to be.
For items that will sit in a contoured cavity (not a through-cut), add 0.25 inches to the height measurement. This ensures a foam floor under the item for bottom protection.
Adding Clearance
Add clearance to your measurements for a proper fit:
- Snug fit (precision items): Add 1/16 inch (1.5mm) per side
- Standard fit (general equipment): Add 1/8 inch (3mm) per side
- Easy access (frequently removed items): Add 3/16 inch (5mm) per side
Measuring Irregular Shapes
Compound Curves
Items like rifle stocks, drone bodies, and camera grips have complex 3D shapes. For manual measuring:
- Place the item on paper
- Trace the outline with a pen held vertically
- Measure the traced outline at its widest and longest points
- Add clearance to each dimension
Protruding Elements
Scope turrets, battery grips, antenna nubs, and cable ports all protrude from the main body. Measure each protrusion separately and note its position relative to the main outline.
Items with Detachable Parts
Decide whether parts will be attached or detached during transport. Measure accordingly. A camera with or without a battery grip is a different shape.
Multi-Layer Planning
Bottom Layer
Measure the depth of your tallest items. This determines the bottom layer thickness. The bottom layer typically houses the primary equipment.
Top Layer
Measure the depth of smaller accessories. The top layer is usually thinner and holds batteries, cables, cards, and small tools.
Total Depth
Add both layer thicknesses plus 0.25 inches for the foam floor. This total must be less than the case interior depth (minus lid foam thickness).
Case Interior Measurements
If you're designing foam for a case you already own:
- Remove all existing foam
- Measure the interior length, width, and depth at the narrowest points
- Note any interior ribs, bumps, or curves that affect usable space
- Measure both the base depth and lid depth separately
Common Measurement Mistakes
- Forgetting accessories — measure everything that goes in the case
- Measuring too tightly — always add clearance
- Ignoring lid depth — items must clear the lid when it closes
- Not accounting for foam compression — foam under load compresses slightly, factor this in for heavy items
Let AI Handle It
Manual measuring works but takes time and introduces human error. CutMyCase's AI approach — upload a photo and get instant outlines — is faster, often more accurate, and eliminates the most common measurement mistakes. Give it a try before breaking out the calipers.