What Size Mattress Fits My Bed Frame? Complete Mattress Size Guide 2026

Mattress Dimensions by Size Guide

Trying to figure out what size mattress fits my bed frame? You're not alone! Mixing up sizes is a common mistake. This guide breaks down every standard mattress size in Canada and matching bed frame dimensions so you get the perfect fit.

Canadian Mattress Size Comparison Chart to Answer: What Size Mattress Fits My Bed Frame
Size Inches Best For Frame Needed
Twin / Single 38" × 75" Kids, guests 38–39" × 75–76"
Twin XL 38" × 80" Tall teens, dorms 38–39" × 80–81"
Full / Double 54" × 75" Solo adults, teens 54–55" × 75–76"
Queen 60" × 80" Couples (most popular) 60–62" × 80–82"
King 76" × 80" Spacious couples, families 76–78" × 80–82"
California King 72" × 84" Tall couples, narrow rooms 72–74" × 84–85"

Quick tips: • Typical mattress thickness: 6–16 inches. • Always measure the inside of the bed frame where the mattress sits.

How to measure your bed dimensions and get the right mattress

How to Measure Your Bed Frame (Step-by-Step)

  1. Remove old mattress and bedding.
  2. Measure inside width (rail to rail).
  3. Measure inside length (head to foot).
  4. Allow 1–2 inches of wiggle room.
  5. Compare to the chart above.

Pro tip: Exact 60" × 80" inside = Queen frame.

Common Search Questions Answered

• What size mattress fits a queen bed frame? → Standard Queen (60" × 80"). 

• Will a king mattress fit a queen frame? → No – it’s 16" wider and will overhang or not fit.

• What size bed frame for a full mattress? → Full/Double frame (54–55" × 75–76" inside).

• California King vs King frames? → NOT compatible! King = wider, Cal King = longer.

• What size mattress for Twin XL frame? → Only Twin XL. Regular Twin is 5" too short.

Best Sizes for Different Sleepers

Situation Best Size Why
One adult who likes space Full or Queen Full saves room, Queen feels luxurious
Couple under 6' tall Queen Perfect balance of size & cost
Tall couple or with kids/pets King or Cal King More room to stretch
Kid or guest room Twin / Twin XL Saves floor space
Growing teen (future dorm) Twin XL Fits college bunks later

Note for Canadian Shoppers

Canada uses identical sizes to the US. “Double” = Full.

Final Checklist

  • Measured inside dimensions?
  • Added 1–2" clearance?
  • Checked thickness vs side-rail height?
  • Not an antique/custom weird size?

Happy sleeping on a mattress that actually fits! 🛏️

Last updated: November 2025