Millimeter Conversion Chart
MILLIMETERS TO INCHES — CRYSTAL PRISM SIZE GUIDE
When shopping for crystal prisms for chandeliers, sizes are listed in millimeters (mm) — the international standard for crystal manufacturing. Use this free mm to inches conversion guide to find the right crystal prism size for your chandelier restoration or replacement project.
Measuring an existing prism before converting its size? Use our guide to measuring chandelier crystals to confirm length, width, shape, hole placement, and the assembled drop.
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HOW TO CONVERT MM TO INCHES
Divide the millimeter measurement by 25.4:
Inches = Millimeters ÷ 25.4
Example: 120mm ÷ 25.4 = 4.72 inches
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MOST POPULAR MM TO INCHES CONVERSIONS
Small Crystal Prisms & Beads:
6mm = 0.24 inches (1/4")
8mm = 0.31 inches (5/16")
10mm = 0.39 inches (3/8")
14mm = 0.55 inches (9/16")
18mm = 0.71 inches (11/16")
20mm = 0.79 inches (3/4")
22mm = 0.87 inches (7/8")
26mm = 1.02 inches (1")
28mm = 1.10 inches (1-1/8")
30mm = 1.18 inches (1-3/16")
32mm = 1.26 inches (1-1/4")
Standard Chandelier Crystal Prisms:
38mm = 1.50 inches (1-1/2")
40mm = 1.57 inches (1-9/16")
45mm = 1.77 inches (1-3/4")
50mm = 1.97 inches (2")
63mm = 2.48 inches (2-1/2")
76mm = 2.99 inches (3")
89mm = 3.50 inches (3-1/2")
Large & Statement Crystal Prisms:
100mm = 3.94 inches (3-15/16")
110mm = 4.33 inches (4-5/16")
115mm = 4.53 inches (4-1/2")
120mm = 4.72 inches (4-3/4")
128mm = 5.04 inches (5")
140mm = 5.51 inches (5-1/2")
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CRYSTAL PRISM SIZE GUIDE
Not sure which size you need? Here's a quick reference guide for chandelier crystal prisms:
Small Chandeliers (under 18" wide)
→ Use crystal prisms 14mm to 38mm
Standard Chandeliers (18" to 24" wide)
→ Use crystal prisms 38mm to 63mm
Large Chandeliers (over 24" wide)
→ Use crystal prisms 63mm to 114mm
Statement Chandeliers (over 36" wide)
→ Use crystal prisms 89mm to 140mm
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| Size in mm | Size in In |
|---|---|
| 14mm | 9/16" |
| 16mm | 10/16" |
| 18mm | 11/16" |
| 20mm | 3/4" |
| 22mm | 7/8" |
| 24mm | 15/16" |
| 26mm | 1" |
| 28mm | 1 1/16" |
| 30mm | 1 3/16" |
| 32mm | 1 1/4" |
| 38mm | 1 1/2" |
| 40mm | 1 9/16" |
| 45mm | 1 3/4" |
| 50mm | 2" |
| 58mm | 2 1/4" |
| 63mm | 2 1/2" |
| 70mm | 2 3/4" |
| 76mm | 3" |
| 85mm | 3 1/3" |
| 89mm | 3 1/2" |
| 95mm | 3 3/4" |
| 100mm | 4" |
| 110mm | 4 1/3" |
| 115mm | 4 1/2" |
| 120mm | 4 3/4" |
| 125mm | 5" |
| 140mm | 5 1/2" |
| 150mm | 6" |
FREQUENTLY ASKED QUESTIONS
Q: How many inches is 120mm?
A: 120mm = 4.72 inches (approximately 4-3/4 inches)
Q: How many inches is 110mm?
A: 110mm = 4.33 inches (approximately 4-5/16 inches)
Q: How many inches is 100mm?
A: 100mm = 3.94 inches (approximately 3-15/16 inches)
Q: How many inches is 115mm?
A: 115mm = 4.53 inches (approximately 4-1/2 inches)
Q: How many inches is 140mm?
A: 140mm = 5.51 inches (approximately 5-1/2 inches)
Q: How many inches is 89mm?
A: 89mm = 3.50 inches (3-1/2 inches) — the most popular large crystal prism size for chandeliers
Q: What size crystal prism do I need for my chandelier?
A: Most standard chandeliers use crystal prisms between 38mm (1.5 inches) and 76mm (3 inches). Larger statement chandeliers may use 89mm to 114mm prisms. Contact The Crystal Place at sale@crystalplace.com for expert sizing advice.
Q: Where can I buy crystal prisms by mm size?
A: The Crystal Place (CrystalPlace.com) carries crystal prisms in sizes from 6mm to 140mm — the largest selection of crystal prisms for chandeliers available online since 1992.