How To Measure For Outdoor Bench Cushions

How to Measure Outdoor Bench Cushions (Benches, Porch Swings, Outdoor Swings & Built-In Seating)

Outdoor bench cushions seem simple—until you realize how many “bench” situations exist: a standard garden bench, a porch swing, a built-in banquette, poolside bench seating, or a long bench tucked against a wall. The good news: if you measure the bench frame correctly (not just the old cushion), you’ll get a clean fit, better comfort, and a cushion that stays put.

This guide walks you through how to measure outdoor bench cushions, including swings and built-in benches, plus how to choose thickness, ties/Velcro ties, and finish details like piping.

Step 1: Identify Your Bench Type

Before measuring, note what you’re measuring for:

• Standard outdoor bench (freestanding)

• Porch swing / outdoor swing (moves, needs better anchoring)

• Built-in bench seating (often custom lengths, corners, walls, odd shapes)

• Bench against a wall (depth and clearance matter)

Step 2: Measure the Bench Frame (Start Here)

Old cushions compress and can shrink at corners. Frame measurements are the truth.

1) Bench Width (left to right)

Measure the usable seat area from one side to the other.

• If the bench has arms: measure inside the arms

• If no arms: measure edge to edge of the usable seat deck

Bench Width = ___ inches

2) Bench Depth (front to back)

Measure from the front edge of the seat deck back to:

• the backrest (for a bench with a back), or

• the rear edge of the seat deck (for backless benches)

Bench Depth = ___ inches

Wall tip: If the bench is against a wall or built-in, consider leaving a little clearance so the cushion doesn’t rub and buckle.

3) Seat Deck Height (ground to seat deck)

Measure from the ground to the top of the bench seat deck (no cushion).

Seat Deck Height = ___ inches

You’ll use this to confirm comfort once you pick thickness.

Step 3: Choose Thickness (Comfort + Finished Seat Height)

Bench cushion thickness depends on:

• how firm the seat surface is (slats vs solid)

• seat deck height (low benches often feel better with thicker cushions)

• how you’ll use the bench (quick sitting vs lounging)

Common thickness ranges:

• 2"–3": slimmer profile, good for higher benches

• 3"–4": the comfort “sweet spot” for most benches

• 4"–6"+: plush comfort, great for built-in banquettes and deeper bench seating

Step 4: Confirm Finished Seat Height (Ground to Top of Cushion)

This is the comfort check that prevents ordering a cushion that feels too tall or too low.

Finished Seat Height = Seat Deck Height + Cushion Thickness

Example:

• Seat deck height: 16"

• Cushion thickness: 3"

• Finished seat height: 19"

Step 5: Porch Swings and Outdoor Swings (What’s Different)

Swings need the same measurements as benches—plus two swing-specific checks:

1) Measure inside the arms (if your swing has arms)

Swings often have arms that narrow the usable width.

2) Plan tie placement for movement

Swings move, so ties matter more. You’ll usually want:

• ties at the back corners (most important)

• optional extra ties along the back for long swings

Make sure ties don’t interfere with chains, hangers, or hardware.

Step 6: Built-In Bench Seating (Custom Sizes and Shapes)

Built-in benches are rarely “standard,” and they often look best with custom sizing.

What to measure for built-ins:

• full usable width of each bench run

• depth of the seat area (front to back)

• obstacles: walls, posts, corner returns, trim

• whether the bench tapers or angles

Common built-in layouts:

• straight run bench

• L-shaped corner bench (usually best as two cushions that meet at the corner)

• U-shaped banquette

• angled corners or trapezoids

Built-in tip: If your bench is tight against a wall, you may want a cushion depth that leaves slight clearance so the cushion doesn’t rub or bunch.

Step 7: Ties, Velcro Ties, or No Attachments

Bench cushions don’t always need ties, but they’re strongly recommended for:

• porch swings

• slick seat surfaces (metal/aluminum)

• high-traffic seating (kids, pets, parties)

Options:

• Fabric ties: classic and very secure

• Velcro ties: quick on/off, clean look, great for frequent cleaning/storage

• No ties: best when the cushion fits snugly in a built-in opening or the surface has grip

Step 8: Piping or No Piping (Finish Detail)

• Piping (corded edge): tailored, upholstered look

• No piping: clean seam, modern look

Quick Bench Cushion Measuring Checklist (Copy/Paste)

Frame

• Bench width (inside arms if applicable): ___"

• Bench depth (front to back): ___"

• Seat deck height (ground to deck): ___"

Cushion Choices

• Thickness: ___"

• Finished seat height (deck + thickness): ___"

• Piping: Yes / No

• Attachments: Fabric ties / Velcro ties / None

• Use type: Bench / Swing / Built-in

Learn how to measure outdoor bench cushions for patio benches, porch swings, outdoor swings, and built-in bench seating. Step-by-step guide to width, depth, thickness, finished seat height, ties or Velcro options, piping, and custom sizing for built-in benches and corner layouts.