Boxy Bag Base Calculator
Pop in your finished bag size and we'll work out your fabric cut — then tell you exactly which Boxy Bag Tool to grab.
1
Your finished bag size
All in inches — the size you want the bag to be once it's sewn and standing up.
2 Your cut list
Cut four pieces this size — 2 outer and 2 lining.
Fabric Width
– in
Fabric Height (cut ×4)
– in
–"
Cut-out square at each bottom cornerCut this square from both bottom corners of each piece (four in total) to box your base.
The tool for the job
Approx. finished capacity: – litres (minimum estimate — real bags hold a little more)
How to use your cut-out squares
- 1Cut four pieces to the Fabric Width × Fabric Height above — 2 outer and 2 lining.
- 2Line your Boxy Bag Tool's square up with the side and bottom edge at each bottom corner, trace, and cut the square away — both bottom corners on all four pieces.
- 3Sew your two outer pieces right sides together down the sides and along the bottom, leaving the cut-out corners open — then do the same with your two lining pieces.
- 4On both the outer and the lining, match each side seam to the bottom seam, pinch flat, and sew straight across to box the base.
- 5Nest the lining inside the outer and finish as your pattern directs — boxed base done!
Remember: the cut-out square is half the finished base depth — a 1" square gives a 2" base, a 2.5" square gives a 5" base.