Bed Size Calculator
Find the minimum and ideal mattress length from your height, then compare the result against common bed sizes used in your region.
Omni's guidance is simple: your mattress should be at least your height, and ideally about 20 cm longer.
Recommended Mattress Length
--
Run the calculation to see the recommended length and a matching bed size.
Quick Answer
A comfortable mattress should be at least as long as you are, and ideally 20 cm or about 8 inches longer for easy sleeping posture and pillow space.
How to Calculate Bed Size
- Measure your height.
- Choose centimeters or inches.
- Pick your region.
- Click Calculate to get the ideal mattress length and a standard size suggestion.
Formula
Minimum length = your height
Ideal length = your height + 20 cm, or height + 8 inches
Worked Examples
Example 1: A 183 cm tall sleeper should look for at least a 183 cm bed and ideally a 203 cm bed.
Example 2: A 72 inch sleeper should look for at least a 72 inch bed and ideally an 80 inch bed.
Example 3: A taller sleeper may need a 220 cm or 84 inch long mattress for maximum comfort.
How to Interpret the Result
| Output | Meaning |
|---|---|
| Minimum length | The shortest mattress length you should consider. |
| Ideal length | A more comfortable mattress length for everyday use. |
| Standard size | A common commercial size that is close to the ideal length. |
Frequently Asked Questions
Related Calculators
References
- OmniCalculator reference page
- The reference page recommends adding 20 cm or about 8 inches to your height for comfort.
- Last reviewed: March 2026.