What sizes do mattress coils come in?

One listing gives mattress coil dimensions as separate values for spring height and coil size.

Spring height and diameter

For the listed pocket coils, compare spring height with coil size.

• One maker lists pocket coils 30 to 35 mm high, with coil sizes ranging from 50 to 70 mm.
• Another maker offers standard pocket coils in 6-inch and 8-inch heights.
• A different product page lists spring heights of 7 to 28 cm and core diameters of 4 to 7 cm.

Wire diameter

One listing labels the field “wire gauge” and gives a 1.1 to 2.0 mm range.

• Starsprings lists wire thickness of 1.1 to 2.0 mm.
• Suilong allows wire diameter to be customized from 1.6 to 2.3 mm.

Count is not a dimension

Coil count is the total number of springs in a mattress, not the physical size of an individual coil.

• A queen innerspring or hybrid may contain 400 to 1,200 coils.
• ZebSprings lists a density of 200 to 350 coils per square metre.
• Check whether a listing gives a total count or a density.

A pocket spring core can come in different heights and coil sizes.

• One low-profile model is 30 to 35 mm high, with coil sizes of 50 to 70 mm.
• Another maker offers standard pocket coils in 6-inch and 8-inch heights, with counts from 600 to 1,080.
• ZebSprings lists standard pocket spring heights from 60 to 200 mm.
• Starsprings describes its low-profile model as suited to mattresses, toppers, and hybrid systems.
• Ask whether the maker customizes the unit; one page lists fabric material among the options.

Types of mattress coils differ in build and response.

Bonnell coils

Sleep Foundation describes Bonnell coils as hourglass-shaped and joined by wires; innersprings with Bonnell coils tend to feel very bouncy and may disturb some couples.

• Check whether the listing says Bonnell before judging the coil style.

Offset coils

Offset coils have squared top and bottom sections that hinge under weight, making them quieter and more responsive than Bonnell coils.

• Look for the offset label when comparing the hinged response.

Continuous-wire coils

Continuous coils are listed alongside Bonnell and offset coils as innerspring constructions.

• Check whether the product listing names continuous coils.
• If it says only innerspring, ask which construction it uses.

Pocket coils

Pocket springs work independently in fabric pockets.

• Look for “pocket” in the coil-style description.
• Compare that construction with listings that name Bonnell, offset, or continuous coils.

Microcoils

The guide places microcoils in a comfort or transition layer.

• Check the product description for the layer where microcoils sit.

Nanocoils

One supplier uses nano coil alongside mini-pocket and micro-pocket labels.

• The listing gives values from 80 to 300 mm.
• Confirm whether the listing says mini pocket, micro pocket, or nano coil.

One maker offers standard pocket-coil units in 6-inch and 8-inch heights, but the facts do not establish which is better overall; Pocket Spring Store says its 8-inch QuadCoil performs better when you lie closer to it and advises limiting extra comfort layers for that product. Metal quality and tempering, height, gauge, shape, and turns affect how firm and supportive coils feel.

Pocket Spring Store lists coil counts by mattress size.

Another supplier lists pocket spring heights from 7 to 28 cm. The product page lists mattress height as 8 to 30 cm, depending on spring height plus comfort layers. They may also include microcoils for additional responsiveness and support.

Gauge measures wire thickness, but coil shape, turns, and other build details also affect feel.

Lower gauge wire

Sleep Foundation describes mattress coils as usually 13 to 17 gauge, with 13 thicker than 17; Tom’s Guide gives 12 to 17 as a typical range and links lower numbers with thicker, firmer coils.

• ZebSprings lists pocket-spring wire at 1.30 to 2.20 mm; Bonell-Bis lists 1.10 to 2.10 mm.
• Compare the stated diameter directly when a listing gives millimeters.

Shape, turns, and layers

Coil shape and turns, along with height and metal quality, affect how firm and supportive a coil feels.

• One supplier lists straight or barrel-shaped pocket coils with 4 to 7 turns.
• Check the listing for coil shape and turns along with gauge.

For one supplier’s pocket-spring unit, check its listed zone count and edge-reinforcement option.

• One supplier offers up to 7 zones, while Bonell-Bis lists 0, 3, 5, 7, or 9 zones, or custom zoning.
• Sleep Foundation says some manufacturers add low-gauge perimeter coils to strengthen edge support; mattresses with these coils can feel especially robust along the edge.
• Tom’s Guide says some hybrid models use extra-gauge coils at the perimeter and across the center.
• One supplier lists optional steel-frame or reinforced-border-wire edge reinforcement; Bekaert lists border-frame wire at 4.00 to 5.00 mm.

Pocket Spring Store lists counts by bed size, while ZebSprings reports density and Spinks gives a reference area. A queen innerspring or hybrid may have 400 to 1,200 coils. Coil count alone does not directly show whether a mattress is sturdier or more durable. One supplier cautions that its counts may change with machine adjustments.

Tom’s Guide cautions that a higher coil count does not prove quality by itself; compare construction details that also affect firmness and support.

Smaller coils raise totals

Pocket Spring Store’s FAQ shows different counts for Queen and Queen QuadMini.

• The FAQ lists a Queen count of 1,008 and a Queen QuadMini count of 1,900.
• The seller warns that pencil-thin coils on the sides of a unit can increase its overall count.

Microcoils can be added

They may also include microcoils for additional responsiveness and support.

• The guide also places microcoils in comfort or transition layers.
• Check the product listing for any stated microcoil placement.

Compare count basis

Check the count basis before judging a larger total.

• ZebSprings lists 200 to 350 coils per square metre, while Spinks bases its coil counts on 150 x 200 cm.
• Compare gauge, height, shape, turns, and metal quality alongside count when judging firmness and support.

The cited pages list customizable coil parameters such as spring height and coil diameter.

Length and width

A spring-unit order can customize wire diameter, turns, spring height, and coil count.

• Ask which coil parameters can be customized, including wire diameter, height, or coil diameter.
• Compare the listed coil parameters, including turns and count, when reviewing a spring unit.

Before ordering

One seller lists its Quad 8 rolls at 14 inches in diameter and its QuadMini rolls at 12 inches.

• Check whether a measurement describes the roll or the spring itself.
• Starsprings lists its low-profile product’s coils as 30 to 35 mm high.

Loaded coil height

Listed spring height is not always identified as a loaded measurement.

• ZebSprings lists heights from 60 to 200 mm but does not label the value as loaded.
• Another supplier lists 7 to 28 cm without stating a loaded-height measurement.
• Ask the maker which condition its height measurement describes.

When using a slatted frame, check Serta’s recommendation; for the DIY zippered-cover build, confirm the seller’s adjustable-base testing data.

Slat spacing

Serta recommends no more than 2 inches between slats when using a slatted frame.

• For Queen, King, and California King slatted frames, Brentwood Home says gaps should be no more than 5 inches and slats at least 2.5 inches wide.
• When using a slatted frame, check Serta’s recommendation.

Adjustable bases

A DIY seller says it has no testing data for its zippered-cover build on adjustable bases.

• Ask the seller before using that build on an adjustable base.
• Serta recommends keeping an adjustable base flat when it is not in use.

Can two coils with the same gauge feel different?

Yes, coils with the same gauge can feel different because shape, height, turns, and metal properties affect firmness and support. Pocket Spring Store says a 15.5G unit can feel different for someone 5'8" and 155 lb than for someone 6'2" and 215 lb. Check the coil setup too: one supplier lists straight or barrel-shaped coils with 4 to 7 turns.

Are coil units compressed for shipping?

Yes, some coil units are compressed and rolled for shipping, though suppliers describe different methods. One retailer says its units can remain compressed for months without coil damage and are not folded when rolled. Another maker says its unit is roll-compressed, heat-sealed in film, and boxed; a different supplier lists flat compression on a pallet or roll-pack.

Which wire-gauge scale does a listing use?

The sources here do not say which gauge scale a given listing uses, so ask the seller; first check whether the listing gives a gauge number or a wire diameter in millimeters. Sleep Foundation describes mattress coils as usually 13 to 17 gauge, with 13 thicker than 17; Tom’s Guide gives 12 to 17 as a typical range and says lower numbers mean thicker, firmer coils. Starsprings lists 1.1 to 2.0 mm, while Bekaert lists pocket-spring wire at 1.50 to 2.00 mm.

Can perimeter coils use a different gauge from center coils?

Some mattress makers use low-gauge perimeter coils for stronger edge support, but these sources do not confirm a gauge difference from the center coils in every bed. The Run-Power listing describes pocket units with firmer-edge construction. Some hybrid models use extra-gauge coils at the perimeter and across the center. One supplier lists optional steel-frame or reinforced-border-wire edge reinforcement; Bekaert lists border-frame wire at 4.00 to 5.00 mm.

We read 15 published pages from 13 sites (starsprings.com, Sleep Foundation, run-power.com, tomsguide.com and 9 more), checked in October 2026. Every sentence in the answers above cites one of them; the offer card at the end names its own source. This page reports published sources only; we did not test mattresses in person.