Mattress Size Calculator

Calculate optimal mattress size based on your height using professional sizing standards

Your Measurements

Height (Feet)

Height (Inches)

Primary Sleep Position

Comfort Preference

How It Works

Enter Your Height

Input your height in feet and inches for accurate calculations.

Professional Formula

We add 20cm (8 inches) to your height for optimal comfort.

Size Matching

Get matched to standard mattress sizes with detailed recommendations.

Size Reference

Twin 38" × 75" Single sleepers up to 6'0"

Full 54" × 75" Single sleepers, compact spaces

Queen 60" × 80" Most popular, couples

King 76" × 80" Maximum width, couples

Cal King 72" × 84" Extra length, tall sleepers

Professional Mattress Sizing Guide

Understanding the Height + 20cm Formula

The professional mattress sizing standard of adding 20cm (8 inches) to your height ensures optimal comfort and proper sleep positioning. This formula accounts for natural body positioning during sleep, pillow thickness, and movement space throughout the night.

Why Proper Mattress Length Matters

Insufficient mattress length can lead to poor sleep quality, restricted movement, and discomfort. When your feet hang off the edge or you feel cramped, your sleep cycles are disrupted, affecting recovery and daily performance. Professional sleep specialists recommend the +20cm formula as the minimum for healthy sleep positioning.

Standard Size Considerations

While the height formula determines minimum length requirements, choosing between standard sizes involves additional factors. Queen mattresses (60" × 80") accommodate most sleepers up to 6'4" comfortably, while California King (72" × 84") provides extra length for taller individuals. King size (76" × 80") offers maximum width but standard length.

Sleep Position Impact on Sizing

Your primary sleep position affects space requirements. Back sleepers need the least length as they maintain a straight body position. Side sleepers may curl up, reducing effective length needs. Stomach sleepers often stretch out, requiring more length. Combination sleepers benefit from generous sizing to accommodate position changes.

Couple Considerations

When sharing a mattress, size calculations should accommodate the taller partner's needs. Additionally, consider sleep movement patterns, temperature preferences, and individual space requirements. Queen size works for most couples, while King provides optimal individual space without compromising length.

Quick Facts

80% of adults sleep comfortably on Queen size
California King adds 4" length vs standard King
Proper sizing improves sleep quality by 23%
Height + 20cm is the industry standard

Common Mistakes

Choosing based on room size only
Ignoring sleep position preferences
Not accounting for partner needs
Underestimating movement space

Frequently Asked Questions

What if I'm exactly between two mattress sizes?

When your calculated length falls between standard sizes, always choose the larger option. The extra space improves comfort and accommodates natural sleep movement. For example, if you need 78 inches and fall between Queen (80") and Full (75"), Queen is the better choice despite the extra cost. The improved sleep quality justifies the investment, and you'll appreciate the additional space during restless nights or when sharing the bed.

How does pillow thickness affect mattress length requirements?

Pillow thickness is already factored into the professional +20cm formula. Standard pillows add 4-6 inches to your effective length, while thick or multiple pillows may add up to 8 inches. The 20cm buffer accommodates typical pillow configurations. However, if you use exceptionally thick pillows (over 8 inches) or multiple stacked pillows, consider adding an extra 2-4 inches to your calculated requirement for optimal comfort.

Should couples use the taller partner's height for calculations?

Yes, always base mattress length calculations on the taller partner's height. Both partners will be comfortable when the mattress accommodates the taller person's needs. Additionally, consider each partner's sleep style - if one person tends to stretch out significantly or moves frequently during sleep, factor this into your size decision. Queen size accommodates most couples, but King or California King may be necessary for very tall individuals or those requiring extra space.

Do I need extra length if I sleep with pets?

Pets can significantly impact your effective sleeping space, especially larger dogs that sleep at the foot of the bed. If your pet regularly shares your mattress, consider upgrading to the next size larger than your calculated requirement. For example, if calculations suggest Queen, consider King for a large dog. Alternatively, California King provides extra length while maintaining manageable width. This ensures both you and your pet have comfortable space without compromising sleep quality.

How do adjustable beds affect mattress size selection?

Adjustable beds don't change the fundamental height + 20cm sizing principle, but they may influence your comfort preferences. When the head section is elevated, your effective body length on the mattress decreases slightly, potentially making you more comfortable with standard sizing. However, if you frequently use the bed in flat position or prefer the foot section elevated, stick with the calculated size requirements. Split adjustable beds for couples should accommodate each partner's individual height needs.