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LDU stands for LDraw Unit - the basic unit of measurement in LDraw, the open standard for LEGO CAD programs, and map to the "Fine" grid setting in applications such as MLCad.

Common measurements include:

1 brick width/depth = 20 LDU
1 brick height      = 24 LDU
1 plate height      =  8 LDU
1 stud diameter     = 12 LDU
1 stud height       =  4 LDU    

A 1x1 Brick as 3 Plates in LDUs (via LDraw)

The typical LU (LEGO Unit) measurements are coarser at:

Brick height = 6
Plate height = 2
Stud pitch   = 5

Based on the physical dimensions of a LEGO brick, this means that 1LDU == 0.4mm, based on a stud height (1LU) of 1.6mm.

LDU stands for LDraw Unit - the basic unit of measurement in LDraw, the open standard for LEGO CAD programs, and map to the "Fine" grid setting in applications such as MLCad.

Common measurements include:

1 brick width/depth = 20 LDU
1 brick height      = 24 LDU
1 plate height      =  8 LDU
1 stud diameter     = 12 LDU
1 stud height       =  4 LDU    

A 1x1 Brick as 3 Plates in LDUs (via LDraw)

The typical LU (LEGO Unit) measurements are coarser at:

Brick height = 6
Plate height = 2
Stud pitch   = 5

Based on the physical dimensions of a LEGO brick, this means that 1LDU == 0.4mm, based on a stud height (1LU) of 1.6mm.

LDU stands for LDraw Unit - the basic unit of measurement in LDraw, the open standard for LEGO CAD programs, and map to the "Fine" grid setting in applications such as MLCad.

Common measurements include:

1 brick width/depth = 20 LDU
1 brick height      = 24 LDU
1 plate height      =  8 LDU
1 stud diameter     = 12 LDU
1 stud height       =  4 LDU    

A 1x1 Brick as 3 Plates in LDUs (via LDraw)

The typical LU (LEGO Unit) measurements are coarser at:

Brick height = 6
Plate height = 2
Stud pitch   = 5

For the physical dimensions of a brick, see:

What are the dimensions of a LEGO brick

LDU stands for LDraw Unit - the basic unit of measurement in LDraw, the open standard for LEGO CAD programs, and map to the "Fine" grid setting in applications such as MLCad.

Common measurements include:

1 brick width/depth = 20 LDU
1 brick height      = 24 LDU
1 plate height      =  8 LDU
1 stud diameter     = 12 LDU
1 stud height       =  4 LDU    

A 1x1 Brick as 3 Plates in LDUs (via LDraw)

The typical LU (LEGO Unit) measurements are coarser at:

Brick height = 6
Plate height = 2
Stud pitch   = 5

Based on the physical dimensions of a LEGO brick, this means that 1LDU == 0.4mm, based on a stud height (1LU) of 1.6mm.

LDU stands for LDraw Unit - the basic unit of measurement in LDraw, the open standard for LEGO CAD programs, and map to the "Fine" grid setting in applications such as MLCad.

Common measurements include:

Brick height = 24
Plate height =  8
Stud pitch   = 20

1x1 Brick in LDUs (via Zen Seeker)

The typical LU (LEGO Unit) measurements are coarser at:

Brick height = 6
Plate height = 2
Stud pitch   = 5

For the physical dimensions of a brick, see:

What are the dimensions of a LEGO brick

LDU stands for LDraw Unit - the basic unit of measurement in LDraw, the open standard for LEGO CAD programs, and map to the "Fine" grid setting in applications such as MLCad.

Common measurements include:

1 brick width/depth = 20 LDU
1 brick height      = 24 LDU
1 plate height      =  8 LDU
1 stud diameter     = 12 LDU
1 stud height       =  4 LDU    

A 1x1 Brick as 3 Plates in LDUs (via LDraw)

The typical LU (LEGO Unit) measurements are coarser at:

Brick height = 6
Plate height = 2
Stud pitch   = 5

For the physical dimensions of a brick, see:

What are the dimensions of a LEGO brick