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.

---

HOW TO CONVERT MM TO INCHES

Divide the millimeter measurement by 25.4:

Inches = Millimeters ÷ 25.4

Example: 120mm ÷ 25.4 = 4.72 inches

---

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")

---

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

---

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.