Glass Cutting Calculator
Optimize glass cutting plans — fit more panes per sheet, less scrap, free.
Enter your stock glass sheet size and the panes you need. The calculator lays out panes in score-line-friendly rows across each sheet, so every cut goes edge to edge — the way glass is actually cut — and tells you how many sheets to buy.
FAQ
How does the glass cutting calculator work?
It lays out panes in full-width rows so every score line runs edge to edge across the sheet — exactly how glass cutters work. Panes are placed largest first for tight packing, and the result tells you how many stock sheets you need.
Should I allow pane rotation?
Keep rotation off for coated, tinted, patterned or tempered glass where orientation matters, and for panes whose width/height must match the finished opening. Enable it only for plain clear glass where a 90° turn is acceptable.
Does the calculator handle glass thickness?
Thickness does not affect the layout — only the cutting order in the workshop. Cut all panes of one thickness per plan, and sequence cuts so the last cuts on a sheet are the smallest panes.
How much does glass weigh per square metre?
Float glass density is 2500 kg/m³, so every millimetre of thickness adds 2.5 kg/m². A 4 mm pane weighs 10 kg/m², 6 mm weighs 15 kg/m² and 10 mm weighs 25 kg/m². Pick a thickness above and the calculator totals the weight of your cut plan.
Can I cut tempered glass to size?
No — tempering comes after cutting, and cutting a tempered pane shatters it. Plan and cut ordinary float glass to size first, then temper it, or order pre-tempered panes in the exact finished size. In this calculator, keep rotation off for tempered panes so coatings and orientation match the opening.
Can you cut laminated glass?
Yes — ideally before lamination. After two panes are bonded to the plastic interlayer, cutting means scoring both sides, snapping each leaf and slicing through the interlayer with a heated blade or wire: a professional task, with edges that are never as clean as factory cut. Order laminated glass cut to size; plan ordinary float glass with the calculator above.
How much waste should I add for glass cutting?
The layout itself is exact — add 5–10% for breakage and edge trim depending on your experience and handling risk. Large thin panes and patterned glass belong at the top of that range; a first-time cutter should add more.
Can I include edge-work margins in the layout?
Yes — add the margin to the finished size before entering it. If each pane loses 10 mm to polishing or seaming, enter the pane 10 mm larger per worked edge; the calculator then optimises the enlarged panes and the finished sizes survive the edge work.
What is the thinnest glass I can cut at home?
Two to four millimetre float glass cuts comfortably at home with an oil-filled wheel cutter, a straightedge and steady pressure on a clean, flat surface. Thicker glass needs more practice, and anything beyond 6 mm is workshop territory.
How do I plan an order with several thicknesses?
Run one layout per thickness — 4 mm panes and 6 mm panes never share a cutting plan, because sheets come in fixed thicknesses and you cut a whole sheet of one thickness at a time. The calculator handles each run separately; the plans then execute in any order.
Why must score lines run edge to edge?
Glass breaks along a score only when the crack can travel the full sheet — a score that stops mid-sheet branches into an unpredictable break. That is why the calculator lays panes in full-width rows: every cutting line crosses the sheet from edge to edge.
Laminated or tempered for a table top — which can be resized later?
Neither. Tempered glass shatters if cut after tempering, and laminated glass is a professional-only cut through the interlayer. Order either one cut to size from the start; ordinary float glass is the only sheet you can resize yourself — plan it with the calculator above.