CURTAIN DETAILS · EQUAL CENTRES

Curtain ring spacing calculator.

Mark even ring centres across a finished panel laid flat. Start with the rings you have, or a maximum spacing you choose. See every position from the same finished edge.

Measure the flat panel, not the rail. This is a centre-position model. It does not calculate hung fullness, pleats, eyelet-hole size, hardware clearance or load. Use your actual hardware instructions when choosing a count and inset.

1. Measure one flat panel

Measurement unitsChanging units converts measurements already entered.

Number of identical panelsEvery panel uses the same layout.

Finished flat panel width (cm)From finished side edge to finished side edge, laid flat.

Centre inset at each end (cm)Distance from either finished edge to its outermost ring centre. Both insets are equal.

2. Choose the count or a maximum

How will you choose the rings?

Your chosen spacing limit

Maximum centre spacing (cm)The calculator finds the fewest rings with equal intervals no larger than this value.

Arithmetic runs in your browser. Results clear when an input changes; calculate again to update the plan.

One panel, measured from the left edge

Schematic only. The circles mark centres, not the physical size of the hardware. Calculate a plan to see the layout.

Ring-centre positions, repeated on each identical flat panel
Ring	Distance from the left finished edge

A count gives equal intervals

Subtract the two end insets from the flat width. Divide that span by one less than the number of rings.

See the known-count example →

A maximum gives a whole count

Round the required number of intervals up, then add one ring. Actual spacing can be smaller than your chosen maximum.

See the maximum-spacing example →

Buying fabric or panels?

Ring centres are a separate measurement. Use the original curtain calculator to compare panel packs or full-width fabric drops.

Plan curtain quantities →