# CushionGuide — The Studio

> 8 pages: free calculators and 3D cushion builders. Each page opens with "The quick answer" and answers common buyer questions under "Buyer questions". Root overview: https://cushionguide.com/llms.txt

## 3D builders

- [Pillow Cover Studio: Throw, Lumbar & Bolster Covers in 3D](https://cushionguide.com/studio/pillow-cover-studio/): Pick a size — 16, 18 or 20 in square throws, a 12 × 20 or 14 × 36 in lumbar, or an 8 × 20 in bolster — then the edge: knife, piped or flanged.
- [3D Chair Cushion Builder: Seat Pads With Ties and Piping](https://cushionguide.com/studio/chair-cushion-builder/): Pick the seat shape — square, tapered (wider at the front), horseshoe with an arched back, or round — then width, depth and a thickness of about 2 in (5 cm).
- [3D Bench Cushion Builder: Any Shape, Cut List in Inches](https://cushionguide.com/studio/bench-cushion-builder/): Choose the shape — rectangle, rounded front, trapezoid, three-sided bay, L or U — and enter the exact seat size wall to wall.

## Calculators

- [Seat Cushion Height Calculator: Bench, Table & Knees](https://cushionguide.com/studio/seat-height-calculator/): Subtract the bench height from the sitting height you want, then allow for compression: firm foam sinks roughly 15 % when you sit, softer foam more.
- [Foam Firmness Finder: Density, Firmness & Thickness](https://cushionguide.com/studio/foam-firmness-finder/): Choose foam by two numbers, not one: density (lb/ft³ or kg/m³) decides how long it lasts, firmness (indentation hardness) decides how it feels.
- [Cushion Fabric Calculator: Yards & Meters, Piping Included](https://cushionguide.com/studio/fabric-yardage-calculator/): A boxed cushion needs two panels (length and depth plus seam allowance), a boxing strip as long as the perimeter and as wide as the thickness plus seam allowance, and — with piping — strips about twice the perimeter long.
- [Bay Window Cushion Calculator: Every Piece, to Scale](https://cushionguide.com/studio/bay-window-calculator/): Measure each wall section along the back of the seat, plus either the corner angles, the bay's projection or the straight opening width.
- [Trapezoid Cushion Calculator + Printable 1:1 Template](https://cushionguide.com/studio/trapezoid-cushion-calculator/): Three measurements decide a trapezoid cushion: front width, back width and the straight depth between them.