quiltback.

Quiltback / Your measurements, visible

Enough backing.
Every seam
accounted for.

Plan a straight-strip quilt backing from your actual bolt width. Compare seam directions, keep cutting reserves visible and round to the quantity your supplier sells.

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  • Local calculations
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01 / Quilt + bolt dimensions

Keep the seam visible.

Changing units converts every current width measurement.
Your chosen margin at left, right, top and bottom.
Your backing fabric
Each join uses this amount from both strips.
Directional prints or your quilting method may rule out a direction.
Your supplier’s selling increment

Changing purchase units keeps the entered increment number: 0.25 m becomes a 0.25 yd selling step. Project dimensions are converted separately.

02 / Rounded bolt length to buy
4.5 metres

2 full-width strips × 221 cm long · vertical seams

Target backing size
170 × 220 cm
Usable fabric width
108 cm
Raw bolt length
4.42 m / 4.834 yd
Extra from purchase rounding
8 cm

Seam-direction comparison

    Full-width strips with straight joins. No diagonal piecing, pattern matching, shrinkage or offcut reuse. You choose the margins and cutting reserves. See the method.

    Useful numbers.
    Visible assumptions.

    Read the worked guide ↗

    Start with your margin.

    You choose the extra backing around the quilt top. The tool adds it to every edge and shows the target panel size.

    Joining consumes width.

    Each seam uses an allowance from both strips. The panel coverage reflects those joining losses before counting strips.

    Keep purchasing separate.

    The raw cutting length and rounded supplier quantity are both visible. Directional prints and quilting requirements remain your choice.