SyntaxFlow
Three panes of float glass in the dark, their green edges lit, in front of a drafting grid that the glass bends.

Check it, size it, cut it.

Free calculators and cutting optimizers for glass, windows, the building envelope, metal and wood. Every answer comes with its formula and its standard, and nothing you type leaves your browser.

Find your tool Open a worked project

No account and nothing uploaded. Published by HU Ingenieros, who have written software for the glass trade since 1976.

19 tools

Glass and glazing

Wind load and thickness, weight, U-value, balustrades, cutting and offcuts, and the schedule checker for whole facades.

All glass tools
Seven panes of float glass from 4 to 19 mm standing side by side; the edge of each is greener as the glass gets thicker.

4 tools

Windows and frames

Whole-window U-value, sash weight and hinge load, condensation at the glass edge, and daylight.

All window tools
A thermally broken aluminium window frame cut in section, with a 4-16-4 insulating glass unit, its spacer, seals and gaskets.

4 tools

Building envelope

Wall and roof U-values, interstitial condensation, thermal bridges and the heat load of a house.

All envelope tools
A wall opened layer by layer: render, 115 mm brick, 100 mm mineral wool, 100 mm aerated block and plasterboard.

3 tools

Metal and profiles

Bars cut with the fewest lengths, weight per metre, and the flat length of bent sheet.

All metal tools
A stack of steel and aluminium profiles with their saw-cut ends towards you: tubes, an angle, a channel, an I-section and flat bar.

3 tools

Wood and panels

Panels cut with the grain and the kerf counted, edge banding by the metre, and board feet.

All wood tools
An oak-veneered board with four cabinet parts from a cutting plan lifted off it, the first with its edge banding, and oak planks behind.

By task

Cut lists, for every trade

The same question in every workshop: the fewest sheets or bars for a list. Panels with the grain, glass with the offcuts already on your rack, bars and profiles with the saw kerf. Each one prints the plan the saw works from.

All cutting optimizers
Panel cutting plan from the optimizer's own example: parts drawn to scale on a sheet, with cuts and offcuts
Real output: 34 cabinet parts on 3 sheets of 2440 × 1220, 90.1 % of the board used.

The working, in plain sight

Every figure shows where it comes from

Under every result there is a «Show the working» panel: the formula, your own numbers put into it, and the limit it is checked against. You can repeat it on a pocket calculator.

9.96N/mm²

Bending stress σ — a 1200 × 2200 mm pane of 10 mm toughened glass under 1.20 kN/m²

σ = β · q · b² / t² = 0.5762 × 0.001200 × 1200² / 10² = 9.96 N/mm² fg;d = 87.5 N/mm² → 9.96 / 87.5 = 11 % of its limit D = E · t³ / (12 · (1 − ν²)) = 6.159 × 10⁶ N·mm w = α · q · b⁴ / D = 0.00945 × 0.001200 × 1200⁴ / 6.159 × 10⁶ = 3.82 mm limit 18.46 → 21 %
β from the method's table, interpolated for a/b = 1.833
EN 16612EN 1991-1-4ASCE 7EN 673EN 572-1BS 6180EN ISO 10077-1EN ISO 6946EN ISO 13788EN 12831EN ISO 14683DIN 6935

Pro

A whole facade, start to finish

The glazing schedule checker is the paid part of the site. Its worked example opens free, and every step below is there to check.

Paste the schedule

Reference, width, height and quantity, straight out of a spreadsheet. A line can carry its own wind pressure.

Ref  Width  Height  Qty  kN/m2
W01  1200  2200  8
W02  1200  1500  12
W03  900  2200  6
W04  2400  2200  2

Every pane sized, the fewest make-ups

Each pane checked for wind like the single-pane calculator, then the three make-ups that cover all 93 panes, 6.2 % over the pane-by-pane minimum.

The fewest make-ups for the example facade: one to four make-ups with glass weight and how far each is over the minimum

The order list and the report

Grouped by make-up with areas and weights, under your company name and revision.

The printed report with the schedule pane by pane and the order list by make-up
Open the worked example What Pro includes

Free for single checks. Pro for whole projects.

The calculators stay free, without limits or an account. Pro is a single payment for the work around them on a whole job.

Free

€0 no account

  • Every calculator and optimizer, in full
  • The schedule checker in full on your first three projects
  • Print, export to CSV and send a job as a link
  • Works without signal once a page has been opened
Illustration: two pages of a printed project report, with glass samples, a pencil and a tape measure

Pro

€29 once

  • The schedule checker on every project: fewest make-ups, order list, report
  • Compare revisions when the architect moves a window
  • A label for every pane, a 400-offcut rack and the job library
  • One payment, nothing to cancel, fourteen days to change your mind
See everything Pro includes

Every tool, by area

33 tools, all free to use.

Glass and glazing

Windows and frames

Building envelope

Metal and profiles

Wood and panels

How the tools are built

It runs on your machine

Your project dimensions are none of our business. There is no server holding your data because there is no server doing the sums.

The working is on the page

Every result carries the coefficients it came from, a worked example you can check by hand, and a list of what the tool does not cover.

Wrong is worse than missing

Where a figure depends on your National Annex, your wind map or a test report, the tool asks for it instead of inventing it.