What Is the Timber Estimator Calculator?
Estimate the total board-feet of lumber needed for stair treads, risers, stringers, and trim. Board-feet is the standard unit for purchasing hardwood and dimensional lumber. This calculator provides an itemized breakdown so you can create an accurate lumber order and avoid costly overages or shortages.
How to Use This Calculator
- Enter dimensions for each component: tread depth/thickness, riser height/thickness, stringer length/width/thickness.
- Set the number of steps and stringers.
- Add a waste factor (10% is standard for stair construction).
- Review the board-feet breakdown by component and the total with waste.
Why Accurate Timber Estimator Calculations Matter
Lumber is priced by the board-foot (1" × 12" × 12"), and accurate estimation prevents waste and budget overruns. Stair lumber is typically premium-grade (select or #1 common) because of the visible, high-traffic application. At $5–$15 per board-foot for hardwood, even a 10% estimation error can mean hundreds of dollars.
Building Code References
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Frequently Asked Questions
What is a board-foot?+
A board-foot is a volume unit equal to a 1-inch thick, 12-inch wide, 12-inch long piece of lumber (144 cubic inches). It's the standard unit for purchasing hardwood in North America.
How much lumber do I need for a staircase?+
A typical 14-step, 36-inch-wide staircase with 2×12 stringers requires approximately 100–140 board-feet of lumber including treads, risers, and three stringers.