5/8 MDF: actual thickness and weight

A panel averages

0.620–0.630 in

15.88 mm nominal, ±0.13 mm

From the standard, ANSI A208.2-2022

A 4 × 8 ft sheet weighs about

78 lb

75–81 lb across the makers · 46.5 lb/ft³

Median of 3 sources

How thick 5/8 MDF really is

Unlike plywood, MDF is sold at its stated thickness. The MDF standard, ANSI A208.2-2022, lets a panel’s average thickness differ from the specified thickness by no more than 0.005 in (0.125 mm), so 5/8 in MDF measures 0.62 to 0.63 in. A dado cut to 5/8 in fits it. 5/8 plywood is held to a wider range.

What 5/8 MDF weighs

MDF’s weight depends on how densely each mill presses it, so the figure here comes from the makers’ own data sheets for standard (not moisture-resistant or fire-rated) MDF at 5/8 in. The density used is the median of 3 sources (they span 45 lb/ft³–48.5 lb/ft³).

Maker	Density	As printed
Weyerhaeuser	48.5 lb/ft³	Density (> .551"): 48.5 lbs/ft³, 780 kg/m³
Roseburg	45–47 lb/ft³	El Dorado, AR: 5/8 – 3/4 in: 45–47 lbs/ft³
West Fraser	46.5 lb/ft³	5/8 – 3/4 in: 46.5 pcf

Piece	Area	About	Makers’ span
Full sheet, 4 × 8 ft	32 sq ft	77.5 lb	75–80.8 lb
Half sheet, 4 × 4 ft	16 sq ft	38.8 lb	37.5–40.4 lb
Quarter sheet, 2 × 4 ft	8 sq ft	19.4 lb	18.8–20.2 lb

Weight is density × volume: 2.42 lb per square foot of face at 5/8 in. Sheets are made about 1 in longer and wider than their stated size, so a real sheet weighs a little more. For any part size, use the MDF weight calculator.

Sources

How we source these numbers