Key takeaways
- Use a metal tape measure on level ground. For rectangular pieces, measure length at the longest point, width at the deepest point, and height from the ground to the highest point of the back or arm.
- For round tables, measure diameter across the center and height from ground to tabletop. For oval tables, measure both the long and short diameters.
- For chairs, chaises, and sectionals, measure as if you are wrapping a box around the piece. Include cushions if you plan to store them underneath the cover.
- Round each measurement up to the next whole inch, then add the clearance allowance below before comparing to cover dimensions.
What's inside
Canvas covers for patio furniture fit best when you add 1 to 2 inches of clearance to the length and width and 2 to 3 inches to the height, choose a 10 oz to 12 oz canvas for all-season use, and select an uncoated, waxed, or PVC-backed version based on whether you need breathability to prevent mildew or full waterproofing for heavy rain.
How to Measure Patio Furniture for a Snug Canvas Cover
A cover that is too tight stresses seams and zippers, while one that is too loose catches wind and pools water. Measure the furniture itself, not the cover you hope to buy, and always measure at the widest and tallest points including armrests, legs that splay outward, and umbrella holes.
Step-by-Step Measuring Method
- Use a metal tape measure on level ground. For rectangular pieces, measure length at the longest point, width at the deepest point, and height from the ground to the highest point of the back or arm.
- For round tables, measure diameter across the center and height from ground to tabletop. For oval tables, measure both the long and short diameters.
- For chairs, chaises, and sectionals, measure as if you are wrapping a box around the piece. Include cushions if you plan to store them underneath the cover.
- Round each measurement up to the next whole inch, then add the clearance allowance below before comparing to cover dimensions.
Clearance to Add for Each Furniture Type
The allowance prevents a vacuum-tight fit that traps condensation and makes it difficult to put the cover on alone.
| Furniture Type | Measure These Points | Add to Length / Diameter | Add to Width / Depth | Add to Height |
|---|---|---|---|---|
| Rectangular Dining Table (4-6 seats) | Tabletop edge to edge, plus widest leg spread | +2 to 3 inches | +2 to 3 inches | +2 inches |
| Round Table (42-60 inch diameter) | Diameter at top, height to top surface | +2 inches to diameter | — | +2 inches |
| Stacked Chairs (2-4 chairs) | Width at armrests, depth at legs, height to top of stack | +1 to 2 inches | +1 to 2 inches | +3 inches |
| Adirondack / Deep Lounge Chair | Width at arms, depth at splayed legs, height at backrest | +1 to 2 inches | +2 inches | +2 inches |
| 3-Seat Sofa or Sectional Corner | Back width, seat depth, back height | +2 to 4 inches | +2 inches | +2 to 3 inches |
| Chaise Lounge / Sun Lounger | Overall length, width at arms, height at back in reclined position | +2 inches | +1 to 2 inches | +2 inches |
Example: A 72 x 36 x 28 inch rectangular table measures 72 inches long at the top but 74 inches at the feet due to angled legs. Use 74 inches as your base length, add 2 inches, and look for a cover listed as 76 x 38 x 30 inches. For sectionals, measure each section separately if you prefer individual covers; a single large L-shaped cover is harder to handle in wind and usually needs two people to fit.
Leave at least 3 to 5 inches of airflow space between the underside of the cover and the ground. Covers that drag on the patio trap leaves and water. Most well-fitted canvas covers for patio sets include a hem cord or buckle strap 2 to 4 inches above the hem to cinch under the legs and prevent wind lift without touching the ground.
Canvas Fabric Weights Explained
Canvas weight is listed in ounces per square yard. The weight tells you thickness, abrasion resistance, and how the cover drapes. Heavier does not always mean better for every climate.
| Canvas Weight | Typical Thickness | Best Use Case | Water Resistance (Uncoated) | Handling Weight (for 60×80 inch cover) |
|---|---|---|---|---|
| 8 oz Canvas | 0.020 – 0.024 inch | Light seasonal use, covered patios, mild climates | Water-repellent, not waterproof | 2.5 – 3.0 lbs |
| 10 oz Canvas | 0.025 – 0.030 inch | Most popular for patio furniture, balances durability and manageability | Good with water-repellent finish, needs re-proofing annually | 3.2 – 3.8 lbs |
| 12 oz Canvas | 0.031 – 0.036 inch | Year-round outdoor exposure, high wind, coastal sun | High resistance, better tear strength | 4.0 – 4.8 lbs |
| 15 oz+ Canvas / Duck | 0.037 inch+ | Commercial, heavy-duty equipment covers | Very high, but stiff and slow to dry | 5.5 lbs+ |
For most homes, 10 oz treated canvas is the sweet spot. It is heavy enough to resist tearing at corners and grommets but light enough that one person can lift a sofa cover without straining. 12 oz is worth the extra weight if your patio is uncovered year-round, you get frequent UV exposure above 6 hours per day, or you store furniture near salt air.
Fabric weights also relate to storage size. An 8 oz cover for a 54-inch round table typically packs to about 12 x 10 x 6 inches, while a 12 oz version of the same size packs to about 14 x 12 x 8 inches. If you have limited storage in a 10×12 ft balcony storage closet or small shed, lighter canvas saves noticeable space.
Canvas vs. Polyester vs. PVC-Coated Covers: Waterproofing vs. Breathability
The same canvas base can behave very differently depending on its coating or laminate. Your climate and whether cushions stay under the cover should drive the choice.
| Material | Water Protection | Breathability & Mildew Risk | UV & Heat Tolerance | Feel & Noise |
|---|---|---|---|---|
| Untreated / Water-Repellent Canvas (waxed or silicone finish) | Repels light rain and dew, not waterproof in prolonged downpour | High breathability, allows moisture vapor to escape, lowest mildew risk | Excellent, does not crack or off-gas in sun, usually $40–$90 for chair, $80–$180 for table/sofa | Soft, quiet, drapes over curves |
| Polyester with PU Coating (often 600D polyester) | Waterproof with taped seams, sheds heavy rain | Low to moderate, can trap condensation underneath if no vents | Good, but PU coating can degrade after 2-3 seasons of intense sun | Lightweight, crinkly sound in wind |
| PVC-Backed Canvas or Vinyl (PVC laminate) | Fully waterproof, even with standing water | Very low, requires mesh vents to avoid mildew and rust | Good waterproofing but can become stiff and crack in freezing temps below 20°F/-6°C and soften in heat above 95°F/35°C | Stiff, plasticky, heavier to fold |
Construction details matter as much as the fabric. Look for double-stitched seams with bonded polyester thread, rust-proof grommets or vents near the top to release condensation, and reinforced corners where chair arms and table legs create stress points. A cover without vents may keep rain out but will trap humid air inside, which is the most common cause of mildew on cushions and powder-coating corrosion on steel frames.
Waterproofing vs. breathability trade-off in practice: If you cover furniture with cushions left on, prioritize breathability. Choose 10 oz water-repellent canvas or a polyester with large mesh vents. If you cover a bare metal or teak frame in a rainy climate and remove cushions, prioritize waterproofing. Choose PVC-backed canvas or PU-coated polyester with taped seams and be sure to pitch the cover so water runs off rather than pools on flat table tops.
Which Cover Should You Choose? A Decision Matrix
Match your situation to the material and weight that will last longest with the least maintenance.
- Small apartment balcony (5×8 ft to 6×10 ft) with 1-2 chairs and a bistro table: Choose 8 to 10 oz water-repellent canvas with drawcord hems. Light weight matters for daily handling and tight storage, and full PVC is unnecessary under a partially covered balcony.
- Uncovered suburban patio in a hot, sunny climate: Choose 12 oz canvas with UV-stabilized finish or solution-dyed polyester. Look for light tan or gray colors that reflect heat; dark covers can raise surface temperature under the cover by 15 to 25°F.
- Rainy Pacific Northwest or Northeast with frequent freeze-thaw: Choose PVC-backed canvas or PU-coated polyester with taped seams and at least two air vents. Add a support pole or overturned bowl under table covers to create a peak and prevent water pooling that can weigh 8 lbs per gallon.
- Kids, pets, and frequent use: Choose 10 oz canvas with reinforced corners and buckle straps instead of elastic only. Elastic degrades with sun and claws, while straps keep the cover secure when furniture is used daily.
- Coastal or windy site: Choose 12 oz canvas with tie-down loops at each leg and a snug fit with only 1 inch of extra width. Excess fabric acts like a sail. Weight helps the cover stay put in gusts over 25 mph.
- Renters who want to avoid re-proofing: Choose 600D PU-coated polyester. It is waterproof out of the box, packs smaller than 12 oz canvas, and general market ranges are usually $30–$70 for chairs and $70–$150 for larger pieces.
General durability expectations in 2026: Uncoated canvas with annual re-proofing typically lasts 4 to 6 seasons, PU-coated polyester 2 to 4 seasons before the coating needs reapplication, and PVC-backed canvas 3 to 5 seasons before the laminate may stiffen. The first failure points are usually zippers, elastic hems, and stitching at corners, not the fabric field itself.
Fit and Care Tips That Extend Cover Life
Before covering, clean and fully dry furniture and cushions. Even slightly damp cushions under a waterproof cover can create mildew in 24 to 48 hours. Brush off debris, and if you wash canvas covers, use cold water and mild soap and air-dry completely before storage. Avoid high heat in a dryer, which can shrink canvas by 2 to 3%.
During winter, check covers monthly after storms. Lift a corner to air out trapped moisture for 15 minutes on a dry day, tighten cords, and clear pooled water or snow. Snow load over 4 inches can stress seams; gently brush it off rather than pulling a frozen cover.
When measuring for replacement, re-measure every 2 to 3 years. Cushions compress, frames may be replaced, and manufacturers list cover dimensions as flat fabric size, not stretched size. A cover listed as 58 inches wide may measure 56.5 inches when cinched. Always compare your clearance-adjusted measurement to the cover’s listed dimensions and choose the next size up if you are between sizes.
