A bed should be at least 10–15 cm longer than you are tall so your feet don’t hang over and you can stretch out; sleep experts often recommend about 20 cm. Width matters too: each sleeper needs at least about 70–80 cm (27–31 in).
How to use the Bed Size Calculator
- Region
- Height of the tallest sleeper
- Sleepers
Results update as you type, and every field accepts the units shown in its menu.
How it works
Choose your region, enter the height of the tallest sleeper and the number of sleepers.
Tips
- Use the figures from your own bills and product labels – prices and appliance ratings vary widely.
- Look at yearly totals: small daily costs add up and make it easier to compare options.
- Round quantities up to whole packs, rolls or bulbs when you shop.
- Re-check the numbers when prices change; most results scale directly with the unit price.
Common mistakes to avoid
- Confusing watts (power) with watt-hours or kilowatt-hours (energy).
- Comparing prices without bringing them to the same unit first.
- Ignoring one-off costs such as installation, delivery or replacement parts.
Inputs explained
| Field | What to enter |
|---|---|
| Region | Choose one: North America, Europe |
| Height of the tallest sleeper | Units: in, cm, ft |
| Sleepers | Choose one: One, Two |
What each result means
- Minimum bed length = [Height of the tallest sleeper] + 0.1
- Comfortable bed length = [Height of the tallest sleeper] + 0.2
Example values
How the main result changes when Height of the tallest sleeper changes and everything else stays at the example values above:
| Height of the tallest sleeper (in) | Comfortable bed length (in) |
|---|---|
| 35 | 43 |
| 52.5 | 60 |
| 70 | 78 |
| 87.5 | 95 |
| 105 | 113 |
| 140 | 148 |
Formula
Minimum length = height + 10 cm (4 in)Comfortable length = height + 20 cm (8 in)Standard lengths: Twin/Full 75 in, Queen/King/Twin XL 80 in, California King 84 in; Europe 190, 200, 210, 220 cmWorked example
Inputs — Region: North America; Height of the tallest sleeper: 70 in; Sleepers: Two.
Results — Minimum bed length = 74 in; Comfortable bed length = 78 in; North American size = Queen (60 × 80 in); European size = 160 × 200 cm.
Frequently asked questions
What bed size do I need if I am 6 ft tall?
At least 76–80 in long – a Queen, King or Twin XL (80 in); a Full (75 in) will feel short.
What is the difference between King and California King?
A King is wider (76 × 80 in); a California King is narrower but longer (72 × 84 in).
How wide should a bed for two be?
At least a Queen (60 in / 160 cm); a King (76 in / 180 cm) gives each person as much room as a single bed.
What formula does the Bed Size Calculator use?
Minimum length = height + 10 cm (4 in).