Sheet Metal Nesting Calculator for Rectangular Blanks
Estimate how many identical rectangular blanks fit on a rectangular sheet. Enter the sheet and blank dimensions, an edge margin, the gap between parts, and the quantity you need. Turn on 90-degree rotation to compare the two simple grid orientations.
This calculator is useful for a quick rectangular layout check before estimating sheet count. It is not a true nesting optimizer and does not analyze a part drawing.
Interactive calculator
Enter values and select Calculate.
How the grid estimate works
The calculator first removes the margin from both sides of each sheet dimension. It then divides the available width and length by the blank dimensions, including the gap between neighboring blanks. For one direction, the count is floor((available size + gap) ÷ (blank size + gap)). The width and length counts are multiplied to get blanks per sheet.
When rotation is enabled, the same calculation is repeated after swapping blank width and length. The calculator selects the orientation that fits more identical rectangles. It reports zero when neither orientation fits, instead of dividing by zero or claiming a blank fits.
Worked example
On a 1,200 mm × 2,400 mm sheet, 300 mm × 400 mm blanks fit four across and six along with zero gap and zero margin. That gives 24 blanks per sheet. If 50 blanks are required, the simple estimate is three sheets. Any material allowance, unusable remnant, or process constraint may increase the actual quantity.
Limitations before you order material
The layout assumes a rectangular blank and a regular grid. It does not rotate each part independently, interlock profiles, account for laser kerf or shear clearance, preserve grain direction, handle clamps, or avoid defects in the stock. A blank may also need extra trim allowance at the sheet edge. The displayed area utilization compares blank area with the full sheet area; it is not a prediction of shop yield.
For irregular contours, mixed part sizes, or production cutting, use a CAM nesting system with the actual geometry and machine constraints. If you need the approximate mass for the selected stock, use the metal weight calculator. The current sheet metal bend calculator can help with a separate flat-pattern calculation; nesting and bend allowance solve different problems.
