# What is the difference between nominal and actual dimensions?

## What is the difference between nominal and actual dimensions?

What are nominal sizes? Nominal size is the size you see printed on the side of your air filter. It stems from the actual size, which is rounded up to the nearest whole inch.

## Why is nominal board size different than actual board size?

The nominal measurement is given to the lumber when it is sawn according to the size it is then. Drying and planing decrease the size making either type of actual measurement different than the nominal size.

**What is the difference between nominal size and actual size of wood stud?**

Actual sizes for softwoods and hardwoods are NOT the same—and standards differ. Softwood nominal dimensions include length and thickness, while hardwood nominal dimensions are for thickness only. Actual thickness size depends on whether the board has been planed on one (S1S) or both (S2S) sides.

### What is nominal size example?

The measurement used in naming a component, not necessarily its actual size when finished or milled. The size of timber is usually given in nominal size, and the actual size is slightly smaller, for example, a 2×4 actually measures 1 5/8 x 3 5/8 inches.

### What does nominal dimension mean?

nominal dimension (nominal size) The sizes used to describe the approximate characteristics of the product rather than the exact dimensions.

**What does 2x4x8 mean?**

The 2 tells us the thickness of the board in inches, the 4 is the width of the board in inches and the 8 is the length of the board in feet.

#### What is nominal wood size?

Lumber sizes are usually given in “nominal” measurements. The nominal measurements are a board’s size before it has been planed smooth (surfaced) on all 4 sides. The actual measurements are the final size.

#### What is nominal wood?

Nominal vs. actual lumber dimensions: Lumber sizes are usually given in “nominal” measurements. The nominal measurements are a board’s size before it has been planed smooth (surfaced) on all 4 sides. The actual measurements are the final size.

**How do you calculate nominal and actual size?**

The rough size can be found by dividing the numerator by the denominator. For example, 8/4 lumber is roughly 2” thick (8 divided by 4 equals 2). But once again, the quarter-scale is the nominal thickness. Most lumber is surfaced 1/16” less than the nominal thickness.