Bed frames · King
King bed frame dimensions and outer footprint
A current King frame example measures 82¼ × 83⅛ inches outside (208.9 × 211.1 cm) around a 76 × 79½ inch mattress opening. Other designs vary.
Semrush US · 2,900 searches/mo · KD 14| Label or calculation | Dimensions | What it means |
|---|---|---|
| Nominal King mattress | 76 × 80 in (193 × 203.2 cm) | The mattress-top reference. |
| Example mattress opening | 76 × 79½ in (193 × 201.9 cm) | Current IKEA MALM specification. |
| Example outer frame | 82¼ × 83⅛ in (208.9 × 211.1 cm) | Adds about 6¼ in width and 3⅝ in length. |
Use the exact frame’s assembly and support specifications. A platform, sleigh, canopy, or upholstered King can have a much larger exterior.
Reserve space for the 82-inch-plus exterior
The example footprint needs roughly 6.9 × 6.9 feet before adding walking clearance or nightstands. Rotate the actual exterior dimensions in the room plan.
Split foundations do not shrink the frame
A two-piece King foundation can simplify access, but the assembled bed still uses the King frame’s full outer footprint.
Measurement method
Start with the product and space you actually have.
- 1
Measure the mattress. Record the finished mattress width and length.
- 2
Measure the opening. Check the frame’s internal support opening and ledges.
- 3
Record the exterior. Include rails, upholstery, posts, headboard, and footboard.
- 4
Test the room. Add walkways, furniture operation, doors, and delivery access.
Questions, answered
Frequently asked questions
What is the standard size of a King bed frame?
There is no universal outer-frame standard. The current example is 82¼ × 83⅛ inches around a nominal 76 × 80 inch mattress.
Will a King frame fit a California King?
Not by default. The mattress shapes differ: King is wider and California King is longer.