Calculate bead count and spare beads
Turn a grid size into a shopping quantity with a transparent spare-bead assumption you can change.
Try the numbers
A transparent estimate you can adjust
This is a planning estimate. Confirm the final color quantities, bead system, pack sizes, and heat guidance against your exported project and the manufacturer's instructions.
Formula and assumptions
ceil(width × height × (1 + sparePercent / 100))- • Every non-transparent grid cell uses one bead.
- • The spare percentage applies to the full rectangular estimate.
Worked example
width 29 · height 29 · sparePercent 10 → 926 beads
Evidence to use
A practical checkpoint from this guide
Example: a 28 × 36 portrait has 1,008 grid cells; with 6% spare, plan for 1,069 beads before removing any transparent background cells.
- Count the cells the chart can actually use
- A grid count is the upper bound: width multiplied by height. Transparent cells, holes, and inten
- Choose spare beads from the build context
- Six percent is a reasonable starting point for a careful single build. Raise it for children, wo
- Split the total by color after mapping
- The total tells you scale; the color table tells you risk. A pattern can need only 900 beads ove
Count the cells the chart can actually use
A grid count is the upper bound: width multiplied by height. Transparent cells, holes, and intentionally omitted background can lower the number, but only after the pattern has been generated and inspected. Counting from a thumbnail tends to under-buy because empty-looking areas still contain pale or outline beads.
The calculator keeps the spare assumption visible so another maker can understand where the total came from. That is more useful than a single unexplained number copied into a shopping list.
Choose spare beads from the build context
Six percent is a reasonable starting point for a careful single build. Raise it for children, workshops, fragile designs, or colors that are difficult to replace. Lower it only when you have a full inventory and are comfortable pausing if one bead disappears.
For the 28 × 36 portrait, 1,008 cells plus 6% gives 1,068.48, which rounds up to 1,069 beads. If the final chart has 80 transparent cells, apply that omission before buying rather than subtracting it twice.
Split the total by color after mapping
The total tells you scale; the color table tells you risk. A pattern can need only 900 beads overall and still fail because one outline color has no spare. Export the color quantities and round each purchased pack up according to the pack size you can actually buy.
Save the calculator inputs with the project version. If you change grid size later, you want a new estimate rather than a stale number attached to a different pattern.
Put this into practice
Generate a chart for this bead count
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