Stringer Calculator – Length, Cuts & Count

This tool applies the formula Stringer Length = √(Total Rise² + Total Run²) directly to the measurements you enter, so the result is an exact quantity rather than a rough guess. Because stringers is priced and delivered per unit - cubic meters, square meters, bags or tonnes - a small measurement error multiplies across the entire order, which is why the calculation is worth doing properly. Worked example: 17 risers of 17.9 cm, 26 cm treads: √(3.04² + 4.42²) = 5.36 m stringers - 3 pieces of 2×12 × 5.5 m. One note from practice: Drop the bottom riser cut by one tread thickness so the first step lands flush. Enter the total rise, tread depth and stair width, check the totals, then round up to the nearest whole bag, sheet or roll before you place the order.

1. 1

   Take dimensions

   Note the total rise, tread depth and stair width for the area you are covering or filling.

2. 2

   Run the calculation

   The calculator applies Stringer Length = √(Total Rise² + Total Run²) the moment you type.

3. 3

   Check the breakdown

   Compare base quantity and waste-adjusted totals side by side.

4. 4

   Plan the purchase

   Use the final figure to price and schedule the delivery.

• Forgetting hardware and fasteners

• Unequal riser heights

• Building without permits