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Home / Container & Packing Fit

Will It Fit in a Box?

Enter your item dimensions and box size to check the fit — shipping boxes, moving boxes, and storage containers.

Trusted across thousands of fit checks · updated daily
400 questions answered
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Room Preview·Visual Results·Simulations
Fit summaryFIG. FIT

Whether it fits comes down to the measurements most people skip.

measure exactlyMedium box: ~14" × 14" × 14" interior. Large: ~18" × 18" × 18" interior
The spaceMedium box: ~14" × 14" × 14" interior. Large: ~18" × 18" × 18" interior
What decides itItem dimensions + padding allowance vs. box interior dimensions
What to measureVaries — measure your item including any padding needed

Real openings run about 1 to 2 inches under the labeled size, and a single inch can flip the result. Check your own measurements before you buy or move.

About 10 seconds · no signup

Verdicts compare all six item orientations against the space using verified building standards. See our methodology

10,000+ fit checks run·Last check: a few minutes ago

“Checked my carry-on against 3 airlines before a trip. Saved me a gate-check fee.” — Frequent flyer

Measure smart

What to measure.

Four numbers decide nearly every fit check. Get these right and the rest follows.

  1. 01Box interior dimensions — interior measurements are 0.5–1" smaller than exterior dimensions per side due to cardboard thickness
  2. 02Item dimensions with padding — add 2–3 inches per side for bubble wrap, foam, or packing peanuts around fragile items
  3. 03Weight capacity — standard corrugated boxes hold 20–65 lbs depending on wall thickness (single, double, triple-wall)
  4. 04Shipping carrier constraints — USPS, UPS, and FedEx have maximum size limits (length + girth ≤ 130" for most carriers)

Don't make these

Common mistakes.

Most “it didn't fit” stories trace back to one of these oversights.

  1. ⚠Using exterior box dimensions — a "12 × 12 × 12" box has about 11" × 11" × 11" of interior space
  2. ⚠Not adding padding allowance — fragile items need 2–3 inches of padding on all six sides, reducing usable space significantly
  3. ⚠Choosing a box that's too large — items shift during shipping in oversized boxes, leading to damage; the right-size box is better
  4. ⚠Exceeding carrier size or weight limits — oversize boxes incur surcharges; over-weight boxes may be rejected

Frequently asked

Questions we keep getting.

  • What are standard shipping box sizes?

    Small: 8" × 6" × 4". Medium: 14" × 14" × 14". Large: 18" × 18" × 18". Extra large: 24" × 18" × 18". USPS flat rate: Small (8.6" × 5.4" × 1.6"), Medium (11" × 8.5" × 5.5"), Large (12" × 12" × 5.5").

    01

  • How much padding do I need?

    For fragile items, add 2–3 inches of padding (bubble wrap, foam) on all six sides. For sturdy items, 1 inch of crumpled paper is sufficient. The item should not be able to move when you shake the sealed box.

    02

  • What is the maximum shipping box size?

    USPS: 108" max length, 130" max length + girth. UPS/FedEx: 108" max length, 165" max length + girth. Oversize packages incur surcharges. Girth = 2 × (width + height).

    03

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Verified results for this exact item at specific dimensions — see the margin, the tilt, and the constraint that decided each one.

  • Can i fit a 4.6 x4.4x1.5 in box inside a 6x4x4 in box?
  • Can I fit a box with dimensions 47,3 cm x 42,7 cm x 18 cm in a box with dimensions 64 cm x 41 cm x 38 cm?
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