Baluster Spacing Calculator
Turn clear railing openings into equal end and intermediate gaps, a baluster order, and an optional local material cost without treating a spacing target as a compliance decision.
Part of the Surfaces & Finishes calculators — see all tools in this category.
Baluster spacing estimate
Solve each clear opening between post faces for equal end and intermediate gaps, then see the baluster order and optional local material cost.
Preparing calculator controls…
| Clear run 1 | 2 m; 13 balusters; 14 equal gaps at 96.43 mm |
|---|---|
| Total order | 13 balusters across 1 independently solved run |
Current result
Order 13 balusters for 1 clear run.
- Net clear openings
- 1
- Actual baluster width
- 0.05 m
- Equal gaps
- 14
- Maximum target gap
- 0.1 m
- Ordered balusters
- 13
Measured need is the independently solved whole-baluster count for each clear opening. This calculator has no allowance, spare or pack-size control, so after-allowance need and actual purchased stock both equal the ordered baluster count. Equal end and intermediate gaps may leave no reusable partial quantity. A blank price is an incomplete purchase line, not $0. Posts, rails, connectors, fasteners, cutting, waste/spares, labour, delivery, tax and all other scope are excluded.
- Every run is measured clear between post faces and solved independently; outside-of-post dimensions are not used.
- The maximum clear gap is user-supplied. This quantity result is not a code, railing-load, fastening, or compliance certification.
- Prices cover balusters only; posts, rails, fasteners, and other system components are excluded unless separately estimated.
| Material | Net need | Order quantity |
|---|---|---|
| User-specified baluster | 13 count (ordered) | 13 count (ordered) |
No prices entered
Cost breakdown
No prices entered. This is not a completed zero-cost estimate.
| Line | Purchased quantity / unit / basis | Pricing state | Direct price | Entered line tax |
|---|---|---|---|---|
| Balusters | 13 count (ordered) | Not priced | — | — |
- Direct priced subtotal
- $0.00
- Selected contingency base
- $0.00
- Contingency rate
- 0%
- Contingency amount
- $0.00
- Before-tax total
- $0.00
- Entered line tax
- $0.00
- Contingency tax (not entered)
- $0.00
- Final total unavailable — enter a price to begin the estimate
- —
Missing price categories: Balusters.
Cost by category
No entered prices to chart.
| Category | Cost | State |
|---|---|---|
| Balusters | Not priced | not-priced |
How it works and assumptions
Measure each opening between the inside faces of its posts, then enter the selected baluster width and your project's maximum target gap. The calculator finds the smallest whole baluster count that keeps equal end and intermediate gaps at or below that target.
For deck takeoff context, use the live Deck Baluster Layout & Lumber Takeoff guide; it keeps clear-run spacing separate from supplied lumber schedules and structural decisions.
Worked example
The calculator includes a separate 1.6 m exact-boundary example to make the count and equal-gap arithmetic inspectable independently of the UAT case.