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Mattress Spring Count Explained

Published 2026-08-03. Last updated 2026-08-03. Desk research by Kaiser Khan — we have not product-tested mattress spring count. This is not a shop review and not medical advice.

In short

Spring count is the number of springs in a stated mattress size. On pocket sprung beds it mainly shows packing density, not firmness alone. Always read count with size: one thousand springs in a Single is denser than one thousand in a Super King. Wire gauge, zoning and comfort layers still govern support and durability.

About 2 minutes to read

Neat mattress with turned-down sheets on an upholstered bed in soft daylight
How a finished mattress and bedding stack can look once the bed is made.

What materials go into this mattress?

Typical builds use steel pocket springs, fabric pockets. Exact stacks vary by model. Read the spec, not the shop slogan.

  • steel pocket springs
  • fabric pockets

How long does this mattress typically last?

A typical range is 7– 10 years. Body weight, base support and rotation change that. It is not a warranty promise.

7– 10 years

Count depends on mattress size

Shop listings quote spring count for a specific size. When comparing:

  1. Note the mattress size attached to the count.
  2. Prefer springs per m² when sizes differ.
  3. Ask whether the count includes micro-coils stacked above the main unit.

Pocket vs open coil counts

Construction Typical count pattern What count mainly reflects
Pocket sprung Hundreds to thousands How densely pockets are packed
Open coil / Bonnell Often ~300–500 Larger linked coils
Hybrid Pocket counts plus foam specs Spring density and comfort chemistry

Gauge and zoning matter as much as count

  • Wire gauge — thicker wire generally resists permanent set longer under load.
  • Zoning — firmer coils under hips, softer under shoulders, changes alignment feel without changing the headline count.
  • Comfort layers — wool, foam or latex above the unit dominate the first centimetres of feel.

How it works

Educational diagram showing why the same spring count is denser in a Single than in a Super King, with a wire-gauge firmness callout
Spring count must be read with mattress size. Gauge and comfort layers still govern firmness more than the headline count.

Frequently asked questions

Does a higher spring count mean a firmer mattress?

Not necessarily. Firmness depends on wire gauge, coil shape, comfort fillings and foam hardness. A high-count unit with soft padding can feel softer than a lower-count unit with firm fillings.

What spring count should a pocket sprung mattress have?

UK retail education often treats counts below about 600 in adult sizes as basic. Many guides suggest looking at 1,000+ in Double or King classes. Density per square metre and materials matter more than one magic number.

Why do open coil mattresses show lower spring counts?

Open-coil Bonnell units use larger linked coils, so total counts are often a few hundred rather than thousands. Compare construction type first, then count within the same type and size.