How to Measure Equipment for Custom Flight Cases (Step-by-Step)

<pA church in Dallas ordered 8 custom cases for their audio system. They measured the main mixer as "19 inches wide, 5 inches deep" and sent the dimensions. When the cases arrived, the mixer wouldn't fit—the church had forgotten that the mixer had knobs on top that extended 3 inches higher than the faceplate, and the power cord stuck out the back 2 inches. They needed new cases: $800 in wasted production cost, 3 weeks of delay, and a Sunday service without proper audio. The factory couldn't make the old cases work—they were built to the wrong specs. This is the #1 measurement mistake I see: measuring the "book" dimensions of equipment and forgetting protrusions (knobs, connectors, antennas, handles, feet). A custom case that doesn't fit is useless—it's expensive scrap. This guide shows you exactly how to measure equipment for a custom flight case, what to measure that most people miss, and how to send specs that get the case right the first time.

Tools You’ll Need

Before you start measuring, gather these tools:
– Tape measure (5m/16ft minimum, metric preferred for international orders).
– Digital calipers (for small parts, connectors, and precise dimensions—$15-30).
– Notebook and pen (or smartphone notes app).
– Camera/smartphone (to photograph the equipment from all angles).
– A friend (to hold the tape or equipment while you measure).
– A flat surface to lay equipment on.

Why metric?
– Most custom case factories work in millimeters (mm). Sending inches (“) means the factory converts, and conversion errors happen (1 inch = 25.4mm, but “19 inches” might be read as 482mm instead of 482.6mm).
– Always send metric: L x W x H in mm.
– If you only have an inch tape, convert: mm = inches × 25.4. E.g., 19″ = 482.6mm → round to 483mm.
– Add 5mm extra if you’re converting (rounding up is better than rounding down).

Photograph everything
– Take photos from all 6 angles: front, back, left, right, top, bottom.
– Close-up photos of: connectors, knobs, antennas, handles, feet, ventilation slots.
– These photos are MORE valuable than measurements alone. They show the factory exactly what your equipment looks like and where protrusions are.
– Send 6-10 photos per piece of equipment. We can build a case from photos alone if measurements are approximate.

What to document per piece:
– Make and model (e.g., “Yamaha MG16XU mixer”).
– Dimensions (L x W x H in mm).
– Weight (in kg).
– Special features: protrusions, mounting holes, rack ears, connectors.
– How it sits in the case (upright, flat, tilted).
– Accessories that go with it (power cable, mic cables, adapter plate).
– Orientation: which side faces up when in use.

A complete measurement sheet saves 2-3 rounds of back-and-forth with the factory. Send it once and the case is right the first time.

Basic Measurements: Length, Width, Height

The three basic dimensions are the starting point. Here’s how to measure them correctly:

Length (L):
– Measure the longest dimension of the equipment (left to right, front to back—whichever is longer).
– Include ALL protrusions: antennas, knobs on the front panel, handles on the sides.
– Measure from the outermost point on the left to the outermost point on the right.
– If the equipment has rack ears, include them (they extend past the main body).
– E.g., a mixer that’s 482mm wide at the faceplate but has rack ears extending to 500mm = 500mm length.

Width (W):
– Measure the depth (front to back).
– Include ALL protrusions on the back: power cord, XLR connectors, USB ports, antennas.
– The power cord sticking out the back adds 10-30mm. Measure with the cord plugged in.
– If the equipment has feet (rubber feet on the bottom), measure with feet on (they add 5-15mm).
– E.g., a mixer that’s 300mm deep at the chassis but has connectors sticking out 20mm = 320mm width.

Height (H):
– Measure the top-to-bottom dimension.
– Include ALL protrusions on top: knobs, faders, antennas, carrying handle.
– Knobs add 15-30mm. Faders add 20-40mm. Antennas can add 50-200mm.
– If the equipment has a carrying handle on top, measure with the handle up (if it stays up in the case) or down (if it folds).
– E.g., an amplifier that’s 88mm tall at the chassis but has knobs sticking up 25mm = 113mm height.

The golden rule:
– Measure the OUTERMOST points. Every protrusion counts.
– When in doubt, measure more (give the factory extra room).
– Extra space in the case is better than no space. We can fill extra space with foam or accessories.
– Too little space = the case doesn’t close. Too much space = the equipment rattles around (we add foam).

How much extra foam clearance to add:
– Sides (L and W): Add 25-30mm per side (50-60mm total). This is foam thickness.
– Bottom (H): Add 40-50mm (thicker bottom foam for impact absorption).
– Top (H): Add 20-30mm (lighter top foam, just for compression protection).
– E.g., equipment is 500×320×113mm.
Case interior: 500+60 = 560mm L. 320+60 = 380mm W. 113+40+30 = 183mm H.
Case exterior: 560+20 (panels) = 580mm L. 380+20 = 400mm W. 183+20 = 203mm H.

What if you don’t know the equipment dimensions?
– Look up the manufacturer’s spec sheet online. It lists dimensions (usually in mm or inches).
– Add 10-15mm to each dimension as a safety buffer (spec sheets sometimes exclude protrusions).
– If you can’t find specs, measure the equipment yourself using the method above.
– When in doubt, send photos and ask the factory to confirm the dimensions.

Advanced Measurements: What Most People Miss

These are the 8 details that cause 90% of custom case fit problems. Don’t skip them:

1. Knobs and faders (front panel protrusions)
– Measure how high knobs stick up from the front panel.
– Knob height: usually 15-30mm. Measure from the panel surface to the top of the knob.
– Faders: 20-40mm tall. Measure from the panel to the top of the fader cap.
– If knobs/faders are on the TOP of the equipment, they add to the height measurement.
– If knobs/faders are on the FRONT (facing you when the case is upright), they add to the depth measurement.
– Foam around knobs must be custom-cut (not a simple rectangle).

2. Connectors and cables (back panel protrusions)
– XLR connectors: add 20-30mm to the depth.
– Power cord: add 15-30mm (measure with cord plugged in).
– USB/Analog ports: add 10-15mm.
– Antennas: add 50-200mm (foldable or detachable—specify which).
– Tell the factory which connectors are on which side. They’ll design foam cutouts around them.

3. Feet and rubber pads (bottom protrusions)
– Equipment feet add 5-15mm to the height.
– Measure with feet attached (don’t remove them).
– If the equipment has rubber feet, the case bottom foam must have cutouts for them (or we can remove the feet—ask).

4. Carrying handles (side protrusions)
– If the equipment has side handles, they extend 50-100mm from the sides.
– Either: measure with handles in the “up” position (they stay up in the case), or fold them down and measure flat.
– If handles fold, specify that they must fold flat in the case.
– Handles add to the length or width measurement.

5. Rack ears (mounting brackets)
– Rack ears extend past the main body by 10-30mm on each side.
– Include them in the length measurement.
– Rack ears have mounting holes—specify the hole pattern (the factory may need to match them).

6. Ventilation slots
– Equipment needs airflow. If the case is sealed tight, the equipment overheats.
– Specify where ventilation slots are on the equipment (top, sides, back).
– We’ll design the case with matching ventilation openings (or leave gaps in the foam).

7. Weight distribution
– Tell us the equipment’s weight. This determines:
– Panel thickness (heavier equipment needs 9mm+ panels).
– Hardware (latches and hinges need to support the weight).
– Wheels (if the case is over 15kg, recommend wheels).
– Foam density (heavier equipment needs stiffer foam).
– Weight also determines the case’s overall design (bracing, reinforcement).

8. Accessories
– List every accessory that goes in the case: cables, adapters, microphones, stands, power supplies.
– Measure each accessory too (or send photos).
– We’ll design separate foam compartments for each accessory.
– Accessories are often overlooked—don’t forget them.

The most common mistake: measuring “book” dimensions only.
– Manufacturer spec: “19-inch rackmount, 1U, 482mm wide, 44mm tall, 300mm deep.”
– Real dimensions with protrusions: 500mm wide (rack ears), 88mm tall (knobs on top), 320mm deep (connectors on back).
– If you send 482×44×300mm, the case interior is 542×94×360mm (with foam).
– The equipment (500×88×320mm) fits in 542×94×360mm? Maybe, but just barely.
– The knobs (44→88mm) take up almost all the top foam. No compression room.
– The connectors (300→320mm) take up all the side foam.
– Result: equipment rattles around (no foam to compress), knobs grind against the lid.

Measure the REAL dimensions (with protrusions), not the book dimensions. It takes 5 extra minutes but saves $800 and 3 weeks.

Creating a Measurement Sheet

A complete measurement sheet has all the info the factory needs to build your case correctly. Here’s the template:

Equipment #1: [Make and Model]
– Length (outermost): ___ mm
– Width (outermost, including connectors): ___ mm
– Height (outermost, including knobs): ___ mm
– Weight: ___ kg
– Orientation in case: upright / flat / tilted
– Protrusions: knobs (height ___mm), connectors (type: ___), antennas (foldable: yes/no), handles (side: left/right, folds: yes/no), feet (height: ___mm)
– Accessories in this case: [list each accessory with dimensions]
– Photos: 6+ angles (front, back, left, right, top, bottom, close-ups)

Equipment #2: [Make and Model]
– [same fields]

Case configuration:
– Number of cases: ___
– Color: [black / blue / red / custom RAL ___]
– Hardware: [draw-tite / butterfly / paddle latches]
– Wheels: [none / 2 wheels / 4 wheels, size ___mm]
– Foam: [single-density / multi-density / shock-mount]
– Special features: [gasket / pressure valve / label / branding]
– Quantity per case: [1 piece / multiple pieces]

What to send to the factory:
1. The measurement sheet above (filled in).
2. 6-10 photos per piece of equipment.
3. A sketch or layout showing how you want equipment arranged in the case (if multiple pieces).
4. Any special requirements (ventilation, cable pass-through, removable lid).

How long should it take?
– For 1 piece of equipment: 10-15 minutes to measure and photograph.
– For 5 pieces: 30-45 minutes.
– This is 10-15 minutes of work that prevents $500-2,000 in wrong-case costs.

Common questions:
– “Can I just send the manufacturer’s spec sheet?” → Yes, but add a note: “Please add 15mm to each dimension for knobs/connectors/feet.” The factory will account for typical protrusions.
– “What if my equipment has odd shapes?” → Send photos. The factory can design custom foam around any shape.
– “What if I’m not sure about dimensions?” → Add 10-15mm extra. It’s better to have extra space than no space.
– “How do I measure equipment that’s already in a case?” → Take it out and measure directly. Don’t guess from the old case’s interior.
– “Can you build a case from photos only?” → Yes, for standard equipment. Send clear photos from all angles and we’ll estimate dimensions. We’ll confirm before production.

The measurement verification process:
1. You send: measurement sheet + photos.
2. We review: check for missing protrusions, ask questions if needed.
3. We send: a CAD drawing or foam layout showing how the case will be built.
4. You review: confirm dimensions and layout. Request changes if needed.
5. We produce: final case built to approved specs.

This verification step takes 1-3 rounds of email. It’s the most important step in getting the case right. Don’t skip it.

Ready to Protect Your Valuable Equipment?

ROBUST CASE specializes in custom flight cases engineered and produced in Changzhou’s aluminum case manufacturing cluster. OEM/ODM partner with our partner factories operating under ISO 9001 quality systems. We’ve built cases for 10,000+ customers across 40+ countries. Our measurement process is proven: you send photos + measurements, we send CAD layouts for approval, and we build the case to exact specs. MOQ: 10 cases for custom, 1 case for stock. Lead time: 25-30 days production + 5-7 days shipping.

Send us your equipment list with: make/model, dimensions (LxWxH in mm), weight, photos from all angles, and how you want it arranged in the case. We’ll provide a CAD layout and quote within 3 business days. We can also recommend the right foam density, hardware type, and case configuration based on your equipment’s weight and usage.

Request a Free Quote → https://coral-chamois-286436.hostingersite.com/get-a-quote/

Email: nick@http://http://https://robust-case.com/wp-content/uploads/2026/09/emergency-medical-scene-2.jpg.com/wp-content/uploads/2026/09/722_1691-centered-1-3.png.com/wp-content/uploads/2026/09/faq-support-2.jpg.com |
WhatsApp: +86 176 2594 7792
Changzhou, Jiangsu Province, China | Mon-Sat 8:30AM-6:00PM GMT+8

Related Reading

• How to Measure Equipment for Custom Flight Cases: A Step-by-Step Guide
• How to Measure Equipment for Custom Flight Cases: A Complete Guide
• How to Measure Equipment for Custom Cases: Avoid 8 Common Mistakes