PuzOdyssey
Puzzle Edge Piece Calculator
Puzzle edge piece calculator
Two side counts. Every border piece accounted for.
Have you found them all?
Enter the edge pieces you have found.
For rectangular puzzles with a regular grid. Count pieces, not inches or centimetres.
How many edge pieces are in your puzzle?
Count the pieces along the top and down one side, including the corners in both counts. The calculator doubles each side and subtracts four so every corner is counted just once.
For example, a 38-by-27 grid has 126 edge pieces and 1,026 pieces in total. A 40-by-25 grid also has 126 edges, while a 50-by-20 grid has 136. The grid determines the answer.
How many edge pieces are in a 1000-piece puzzle?
A 40-by-25 grid has 126 edge pieces. But “1000 pieces” on the box does not identify one fixed grid: the cut, proportions and actual piece count can vary. Enter your puzzle’s actual pieces across and down for its border count.
What about 500, 1500 or 2000 pieces?
The same formula works for any rectangular, regular-grid puzzle with at least two rows and columns. For example, 25 across and 20 down gives 500 total pieces and 86 edge pieces. Use the actual grid rather than assuming all puzzles with the same box count share a border.
Are the four corner pieces included?
Yes. Every result includes the four corners, each counted once. Include them when counting how many edge pieces you have found.
Does it work for round or random-cut puzzles?
No. Round, shaped, borderless and irregular-cut puzzles do not necessarily follow a rectangular grid. This calculator cannot give a reliable border count for those cuts.
Does a lower count mean a piece is missing?
It means you have fewer edge pieces than this grid needs. Check your side counts and sort through the remaining pieces again before concluding that one is missing.
Make room for the whole puzzle.
Check your finished puzzle dimensions against a board.