How long should hanging wire be?

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.

How much should the wire sag?

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.

What gauge of wire do I need?

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.

Should I use braided or solid wire?

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.

How do I attach wire to D-rings?

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.

Where should the wall hook go?

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.

ArtCalcs

Hanging Wire Calculator — Wire Length & Placement

Calculate the wire length and placement for securely hanging a framed artwork.

Frame Width

Outer width of the frame — D-rings sit 10 mm in from each side edge

Frame Height

Outer height — D-rings sit one third of the way down from the top

Total Weight

Frame, glass, mount and artwork combined — use the Frame Weight Calculator if unsure

Wire TypeBraided stainless steel is the professional choice — flexible, kink-resistant and strongest

How We Calculate This

How Wire Length Calculation Works

Wire length = Sagged span + 80 mm twisting allowance

The sagged span is calculated using Pythagoras: the wire forms a shallow V between the two D-rings (set 10 mm in from each side edge) with your chosen sag at the centre. Adding the twisting allowance (40 mm of wrapping at each end by default) gives the total wire needed. D-rings sit one third of the way down from the top of the frame, the standard framing convention.

The wire gauge is an indicative rule of thumb based on total frame weight, with a built-in safety margin. Wire tension is several times the dead weight when the wire hangs at a shallow angle, so framers pick wire whose break strength is 3–4× the frame weight — meaning the suggested gauge is rated above the bare frame weight on purpose.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify quantities before purchasing materials.