Tools

Façade calculators

Free early-stage estimates for glass, thermal, structural, fire and carbon. Work out a make-up here, then take it to the people who can price it.

Every one of these is an indicative early-stage estimate using standard methods — not certified analysis. Swap the preset factors for your datasheet values, and have the final design confirmed by a qualified engineer.

Glass

Glass sizing estimator

Stress, deflection and utilisation of a glazing panel under wind.

EN 16612 with Wölfel/Bennison effective thickness

Glass weight

Weight per m², per panel and per order for any glass build-up.

Nominal densities — glass 2500 kg/m³

Glass acoustics

Estimated Rw (C; Ctr) and the sound-reduction curve for a make-up.

Mass law with a coincidence correction; rating per ISO 717-1

Daylight & solar factor

VLT, g-value, selectivity, solar heat gain and the daylight that reaches the room.

EN 410 optical properties

Envelope, thermal & carbon

Window-to-wall ratio

Glazed proportion per elevation and whole-building, against the usual code limit.

Geometric ratio; limit per ASHRAE 90.1 and similar

Window U-value

Overall Uw from the glazing, the frame and the glass edge.

EN ISO 10077-1

Embodied carbon

Build up a façade’s A1–A3 embodied carbon and its intensity per m².

EN 15804 A1–A3, indicative factors

Structural & metal

Wind load

Design pressure and suction on a façade, zone by zone.

Simplified EN 1991-1-4

Metal weight

Weight of sheet, bar, tube and profiles across common façade metals.

Volume × nominal density

Fire & compliance

External fire spread

Permitted unprotected areas against the distance to the relevant boundary.

Approved Document B, simple methods 1 and 2

Got a make-up that works?

Take it to suppliers who can actually fabricate it. Brief several at once and compare what comes back side by side.

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