Quick conversions — click to fill:
1 ft (30.48 cm)
1 in (2.54 cm)
1 yd (91.44 cm)
48 in / 4 ft
96 in / 8 ft
Standard door (80 in)
Standard ceiling (8 ft)
16" stud spacing
24" stud spacing
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CM to Inches — Common DIY Conversions
| Centimeters | Inches | Feet & Inches | DIY Context |
|---|---|---|---|
| 1 cm | 0.394 in | — | About the width of a pencil |
| 2.54 cm | 1 inch | — | Standard reference: 1 in = 2.54 cm exactly |
| 10 cm | 3.94 in | — | About the width of a standard door handle |
| 30.48 cm | 12 in | 1 ft | One foot exactly |
| 60 cm | 23.6 in | 1′ 11.6″ | Standard kitchen cabinet depth |
| 91.44 cm | 36 in | 3 ft / 1 yd | Standard countertop height |
| 100 cm | 39.37 in | 3′ 3.37″ | 1 meter exactly |
| 121.92 cm | 48 in | 4 ft | Half sheet of 4×8 drywall/plywood |
| 182.88 cm | 72 in | 6 ft | Standard fence height |
| 203.2 cm | 80 in | 6′ 8″ | Standard interior door height |
| 243.84 cm | 96 in | 8 ft | Full 4×8 sheet, standard ceiling height |
| 304.8 cm | 120 in | 10 ft | Common room wall length |
Inches to CM — Common DIY Conversions
| Inches | Centimeters | DIY Context |
|---|---|---|
| 1/4 in | 0.635 cm | Tile grout spacing (narrow) |
| 1/2 in | 1.27 cm | Standard drywall thickness |
| 3/4 in | 1.905 cm | Standard plywood and OSB thickness |
| 1.5 in | 3.81 cm | Actual width of a "2×" dimensional lumber |
| 3.5 in | 8.89 cm | Actual width of a 2×4 stud |
| 16 in | 40.64 cm | Standard stud spacing (OC) |
| 24 in | 60.96 cm | Standard stud spacing (wide) |
| 36 in | 91.44 cm | ADA countertop height, 1 yard |
| 48 in | 121.92 cm | Sheet goods width (plywood, drywall) |
| 96 in | 243.84 cm | Sheet goods length, 8-foot ceiling |
The Formula: CM to Inches (and Back)
// Convert centimeters to inches
inches = centimeters ÷ 2.54
// Convert inches to centimeters
centimeters = inches × 2.54
// The exact definition: 1 inch = 2.54 cm (since 1959)
inches = centimeters ÷ 2.54
// Convert inches to centimeters
centimeters = inches × 2.54
// The exact definition: 1 inch = 2.54 cm (since 1959)
Why 2.54?
The inch was officially defined as exactly 2.54 centimeters in 1959 by an international agreement between the US, UK, Australia, Canada, New Zealand, and South Africa. This is an exact, defined value — not an approximation. All inch-to-metric conversions trace back to this definition.
Using This in Real DIY Projects
- Lumber from metric countries — If you order wood listed in millimeters, divide by 25.4 to get inches.
- European appliances — European kitchen appliances are designed in cm. A standard European base cabinet is 60cm wide (23.6 inches).
- Tile sizing — Tiles sold as "30×30" or "60×60" are in centimeters. A 60cm tile is 23.6 inches — not quite 24 inches.
- Canadian building products — Canada uses metric officially, but construction products often come in both. A 4×8 sheet is also described as 1220×2440mm.
Frequently Asked Questions
How many inches is 100 cm?
100 cm = 39.3701 inches, which is 3 feet and 3.37 inches. 100 cm is 1 meter. This is a handy benchmark: 1 meter is just over 3 feet (39.37 inches).
How many cm is 6 feet?
6 feet = 72 inches = 182.88 cm. This is also exactly 6 × 30.48 = 182.88 cm. A standard 6-foot wood fence panel is 182.88 cm tall.
Is a 2×4 actually 2 inches by 4 inches?
No — and this trips up almost every new DIYer. A 2×4 piece of lumber has nominal dimensions of 2×4 inches, but the actual dimensions are 1.5 inches × 3.5 inches (3.81 cm × 8.89 cm). The wood is planed and dried after cutting, reducing its size. Always use actual dimensions (not nominal) for calculations.
How do I read a tape measure with both cm and inches?
Most US tape measures show inches on one side and metric on the other (or both on one side). The long marks are inches; the short marks between them are fractions (1/2, 1/4, 1/8, 1/16). On the metric side, the longest marks are centimeters; the smallest are millimeters. To read 35mm, that's 3 full centimeters plus 5 millimeter marks.