If Hypnos doesn’t disclose the GSM of their mattresses, how can you determine if you have a higher GSM?
Understanding the approximate GSM (Grams per Square Meter) of a mattress, even when it’s not explicitly stated by manufacturers like Hypnos, is possible by calculating it based on the mattress’s dimensions and total weight.
Firstly, calculate the mattress’s area in square meters (m²) by multiplying its width by its length in centimeters (cm) and then dividing by 10,000.
For a one-sided mattress, the areas are approximately:
- Single – 1.71m²
- Small Double – 2.28m²
- Double – 2.57m²
- King – 3m²
- Super King – 3.6m²
For a double sided mattress, the areas double:
Next, to calculate the GSM, you need the total weight of the mattress and the weight of the springs. Subtract the spring weight from the total mattress weight to find the weight of the fibres. The approximate weight of 1500 pocket springs ranges between 21kg to 35kg, varying by the type and size of spring.
For example, if a king-size double-sided mattress weighs 50kg and contains 1500 pocket springs, subtract the spring weight from the total (let’s say 30kg for this calculation), leaving the fibre weight. Multiply this fibre weight by 1000 to convert it into grams. Finally, divide this number by the area in square meters of the mattress to get the GSM. If the mattress is single-sided, ensure you use the corresponding area in your calculation.
This method gives you a rough estimate of the GSM, helping you assess the density and quality of the mattress’s materials compared to others, even when the GSM is not directly provided by the manufacturer.