3/4 MDF: actual thickness and weight

A panel averages

0.745–0.755 in

19.05 mm nominal, ±0.13 mm

From the standard, ANSI A208.2-2022

A 4 × 8 ft sheet weighs about

93 lb

82–97 lb across the makers · 46.5 lb/ft³

Median of 3 sources

How thick 3/4 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 3/4 in MDF measures 0.745 to 0.755 in. A dado cut to 3/4 in fits it. 3/4 plywood is held to a wider range.

What 3/4 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 3/4 in. The density used is the median of 3 sources (they span 41 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	41–47 lb/ft³	El Dorado, AR: 5/8 – 3/4 in: 45–47 lbs/ft³; Medford, OR: 47 lbs/ft³, average for 3/4 in panels; Pembroke, ON: 41 lbs/ft³, average for 3/4 in panels
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	93 lb	82–97 lb
Half sheet, 4 × 4 ft	16 sq ft	46.5 lb	41–48.5 lb
Quarter sheet, 2 × 4 ft	8 sq ft	23.3 lb	20.5–24.3 lb

Weight is density × volume: 2.91 lb per square foot of face at 3/4 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