Furniture Design Calculators
Calculate shelf spans, drawer dimensions, table proportions, and ergonomic measurements for furniture projects.
Shelf Span Calculator
Calculate maximum shelf span before sagging based on material and load.
Drawer Slide Calculator
Work out drawer and slide dimensions for smooth-running drawers.
Table Leg Calculator
Calculate table leg dimensions and taper angles for stable tables.
Chair Seat Height Calculator
Determine ergonomic chair dimensions based on user height.
Bookcase Calculator
Calculate shelf spacing, material quantities, and dimensions for bookcases.
Cabinet Door Calculator
Work out cabinet door dimensions and overlay calculations.
Drawer Box Calculator
Calculate drawer box dimensions and material for cabinet drawers.
Hinge Calculator
Determine hinge type, size, and placement for doors and lids.
Ergonomic Desk Calculator
Calculate desk height and dimensions based on user measurements.
Bed Frame Calculator
Work out bed frame dimensions and slat spacing for UK mattress sizes.
10 free calculators in Furniture Design
Furniture Design Calculations
Good furniture design balances aesthetics, ergonomics, and structural integrity. These calculators help you get the proportions and dimensions right before you start cutting, saving time, materials, and frustration.
Shelf sag is one of the most common furniture design failures. A shelf that looks fine when empty can bow badly under a load of books. Our shelf span calculator uses material properties and load estimates to determine maximum spans before visible deflection occurs.
Ergonomic dimensions are critical for furniture that people use every day. Standard desk height is 720–750mm, but the ideal height depends on the user. Our ergonomic desk calculator and chair seat height calculator work out proper dimensions based on the user's height.
UK mattress sizes differ from other countries. A UK double is 1350 × 1900mm, while a king is 1500 × 2000mm. Our bed frame calculator uses standard UK sizes to calculate frame dimensions, slat spacing, and timber quantities.