Engineering utilities
Glass engineering calculators that show their work.
Most online engineering tools hand you a number and hide how they got there. Some of them are simply wrong. Ours print the formula, the coefficients and the standard on the same page as the answer — so you can check us instead of trusting us.
Not an illustration. That is sheet 1 of a real forty-piece job, nested by the optimiser on this site — strips, guillotine cuts, 4 mm breakout, 10 mm trim. The amber rectangles are the glass most software calls waste.
The part that stops you spending money
Those amber rectangles are next month's job.
Every optimiser online nests onto virgin sheets. Your shop has a rack of offcuts already paid for. List it, and the next order is cut out of the rack before it buys a sheet — and an offcut is only opened when doing so removes a whole sheet from the order, because fragmenting good stock for nothing is not optimisation.
Built with people who have spent twenty years inside glass shops — not scraped from other websites. They chain together: work out the wind, carry it into the thickness check, then print the lot for the client.
Wind pressure on a facade
Peak velocity pressure and net design pressure to EN 1991-1-4 or ASCE 7, from the site, the terrain, the height and where the pane sits.
StructuralThickness & deflection
Bending stress and deflection for a pane on four edges. Monolithic and laminated, annealed through tempered — and the thinnest glass that passes.
HandlingGlass weight
Pane, laminate or sealed unit — total, per unit and per square metre — plus how many people it takes to lift it off the van.
ThermalU-value of a sealed unit
Centre-pane Ug to EN 673 for double and triple units, splitting every cavity into its radiation and gas parts.
Safety criticalGlass balustrade
A barrier under line load, at both interlayer bounds — plus the broken-ply check that most calculators quietly skip.
ProductionCutting optimiser
Guillotine strips, real breakout width — and the scrap separated from the offcut that goes back on the rack.
DeliverableSpecification sheet
Collect results from any tool, add your logo, print the branded PDF the client actually receives. Still nothing uploaded.
The glass is only half the window. Whatever the glazing does, the frame and the perimeter decide what the customer actually gets.
Whole-window U-value
Uw to EN ISO 10077-1 from glass, frame and glazing edge — and which of the three is actually costing you.
HardwareSash weight and hinge load
What a sash weighs, and the pull-out it puts on the top hinge. It is not the weight that tears hardware out — it is the width.
MoistureCondensation risk
Glass, spacer and frame against the room dew point — why the edge of the pane goes black first.
DaylightGlazing ratio and daylight
What the frame leaves you, the daylight factor it gives the room, and the watts that light costs.
A wall at 0.25 sounds excellent until you notice the window beside it is at 1.30 and covers a quarter of the facade. Same place, same rules, same honesty about what is left out.
Wall and roof U-value
Layer by layer to EN ISO 6946 — and which layer is actually doing the work.
MoistureInterstitial condensation
Glaser to EN ISO 13788: where the wall gets wet, and the vapour control layer that fixes it.
ThermalWhole-house heat loss
The design heat load in kW — what a heat pump is really sized on, and where the heat is going.
ThermalThermal bridges
ψ values into a y-value, against the penalty default — plus whether the junction goes mouldy.
The principle
If we can't show you the working, we haven't finished the tool.
Every result carries the line of coefficients it came from. Every page has a worked example you can check by hand, and a section listing what the tool does not cover. When we approximate, we say where and which way the error goes.
That last part is not modesty. A calculator that pretends to cover everything is the dangerous kind — and there are plenty of those, including one currently in Google's top three telling people that a glass pane's weight determines its wind resistance.
It runs on your machine
Not because it is fashionable, but because your project dimensions are none of our business. There is no server holding your data because there is no server.
Free, and no account
No sign-up wall, no trial, no email for a PDF. When there is something worth paying for it will be obvious what it is, and it will not be the calculator.
Wrong is worse than missing
Where a figure depends on your National Annex, your wind map or a test report, we ask you for it rather than invent it. A confident wrong number costs more than an honest gap.
Start with the wind, end with the PDF.
The calculators chain together — wind pressure into thickness into weight — and the last one turns the lot into the document your client signs off.