How much extra space should I leave in a shipping box?

Add 2 inches on each side of the item (4" total per dimension). This provides room for bubble wrap, packing paper, or foam. A 10×10×10" item needs a 14×14×14" box.

What are standard shipping box sizes?

Common sizes: Small (12×10×6"), Medium (18×14×12"), Large (24×18×18"), Extra Large (24×20×24"). Most carriers also accept custom sizes up to 165" combined length + girth.

ItemFits

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Home / Container & Packing Fit

What Size Box Do I Need for Shipping?

Enter your item dimensions and we'll recommend the smallest standard box that fits — with room for packing material.

Trusted across thousands of fit checks · updated daily

400 questions answered

Room Preview·Visual Results·Simulations

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.

01Item dimensions at the widest points — include any protruding parts (handles, knobs)
02Add 2" on each side for bubble wrap or packing peanuts (4" total per dimension)
03Weigh the item — carrier box size limits are based on both dimensions and weight

Don't make these

Common mistakes.

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

⚠Choosing a box that barely fits — you need 2" of padding on all sides to prevent damage in transit
⚠Using an oversized box — items shift and break during shipping if there is too much empty space
⚠Ignoring carrier dimensional weight pricing — an oversized lightweight box costs as much to ship as a heavy small one

Frequently asked

Questions we keep getting.

How much extra space should I leave in a shipping box?
Add 2 inches on each side of the item (4" total per dimension). This provides room for bubble wrap, packing paper, or foam. A 10×10×10" item needs a 14×14×14" box.
01
What are standard shipping box sizes?
Common sizes: Small (12×10×6"), Medium (18×14×12"), Large (24×18×18"), Extra Large (24×20×24"). Most carriers also accept custom sizes up to 165" combined length + girth.
02

Related fit checks.

What Size PODS Container Do I Need?Calculate the right PODS or portable moving container size. Enter your items for a recommendation based on real packing math.What Size Shipping Container Do I Need?Calculate the right shipping container size for your cargo. Dimensions, weight limits, and packing constraints factored in.Will It Fit in a Suitcase?Check if your items will fit in a suitcase. Compare carry-on, checked, and large suitcase dimensions for packing.Will It Fit in a Bag?Check if your items will fit in a backpack, duffel bag, or tote. Compare bag dimensions and capacity for packing.What Door Width Do I Need for a Washer?Standard washing machines are 27 in wide, so most fit a 30 or 32-inch door — but handles and pedestals add inches. Check your washer and door for an exact verdict.Will a Desk Fit in a Box?Check if a desk will fit in a box. Compare item dimensions with clearances, openings, and practical movement space before you buy or move it.Will a Microwave Fit in a Box?Check if a microwave will fit in a box. Compare item dimensions with clearances, openings, and practical movement space before you buy or move it.

All container fit checks →

Unlock stair simulation, AR visualization, and more.

Will it fit? Know before you buy.

Open the calculator and check any item against any space.

Open the fit calculator

ItemFits

About Blog FAQ Features Pricing Work with us

Home / Container & Packing Fit

What Size Box Do I Need for Shipping?

Enter your item dimensions and we'll recommend the smallest standard box that fits — with room for packing material.

Trusted across thousands of fit checks · updated daily

400 questions answered

Room Preview·Visual Results·Simulations

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.

01Item dimensions at the widest points — include any protruding parts (handles, knobs)
02Add 2" on each side for bubble wrap or packing peanuts (4" total per dimension)
03Weigh the item — carrier box size limits are based on both dimensions and weight

Don't make these

Common mistakes.

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

⚠Choosing a box that barely fits — you need 2" of padding on all sides to prevent damage in transit
⚠Using an oversized box — items shift and break during shipping if there is too much empty space
⚠Ignoring carrier dimensional weight pricing — an oversized lightweight box costs as much to ship as a heavy small one

Frequently asked

Questions we keep getting.

How much extra space should I leave in a shipping box?
Add 2 inches on each side of the item (4" total per dimension). This provides room for bubble wrap, packing paper, or foam. A 10×10×10" item needs a 14×14×14" box.
01
What are standard shipping box sizes?
Common sizes: Small (12×10×6"), Medium (18×14×12"), Large (24×18×18"), Extra Large (24×20×24"). Most carriers also accept custom sizes up to 165" combined length + girth.
02

Related fit checks.

All container fit checks →

Unlock stair simulation, AR visualization, and more.

Will it fit? Know before you buy.

Open the calculator and check any item against any space.

Open the fit calculator

Real checks people ran

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