Work out exactly how many spindles your staircase needs, and a recommended order quantity, in seconds.
Spindle diameter: check your chosen design's product page (Forxa spindles come in 12mm, 14mm and 16mm). Gap: maximum 99mm under UK Building Regs - leave as default if unsure.
Measure along the raked handrail from the bottom newel post to the top newel post - not the treads.
Important - Please Read
This calculator is a guide only, based on general UK spacing rules (Approved Document K's 100mm sphere rule) and standard bracket fitting practice. Real staircases vary in geometry, tread nosings, corner posts, wreaths and local building control requirements. Always measure on site and confirm final quantities with a qualified installer or joiner before ordering. Forxa accepts no responsibility for shortfalls, surplus stock, or incorrectly ordered quantities resulting from reliance on this calculator alone.
This calculator uses the same method as our full measuring guide, based on the UK 100mm sphere rule (Approved Document K). See our Building Regulations guide for full spacing and height requirements. If you're at all unsure, email [email protected] and we'll help you check before you buy.