Hanging Wire Calculator — Wire Length & Placement

The wire should span between the two D-rings with enough extra for wrapping (40 mm each end) and a small sag (about 25 mm). This sag allows adjustment on the wall hook and absorbs minor impacts.

About 25 mm of sag when the frame is hung is ideal. Sag is not just cosmetic: the tighter (flatter) the wire, the higher the tension. At a shallow 5° angle the wire tension is roughly 11 times half the frame weight, and a near-horizontal wire can carry up to 14 times the frame weight — which is what snaps wire, splits frames and pulls out fasteners. Allowing ~25 mm of sag keeps the angle steeper and the tension lower. Thread the wire, then push the centre down ~25 mm.

The gauge recommendation is an indicative rule of thumb keyed to braided picture-wire ratings: #2 braided holds about 5 kg, #4 about 9 kg and #8 about 16 kg. Because wire tension is several times the frame weight at normal sag, framers choose wire whose break strength is 3–4 times the frame weight — so the calculator deliberately recommends a higher-rated wire than the bare frame weight. When in doubt, size up a gauge.

Braided wire is preferred — it is more flexible, easier to work with and less likely to kink. Solid wire is cheaper but harder to thread and can snap if bent repeatedly. Braided stainless steel is the professional choice.

Thread the wire through the D-ring, loop back and twist tightly for 40 mm (about 10 turns). Cut excess wire and flatten the twisted end against the frame. Some framers add a dab of hot glue to secure the twist.

The hook position on the wall depends on where you want the top of the frame. Measure from the top of the frame to where the wire will catch the hook (with sag). Add this to your desired frame-top height for the hook position.