Almost every safe owner we talk to says the same thing a year in: they wish they had bought one size up. A safe is a 20–30 year purchase. Getting the size right the first time costs nothing extra. Getting it wrong means buying twice — and moving a several-hundred-pound safe twice.
Here is the five-step method we walk customers through on the phone every day.
Take everything you plan to store — documents, firearms, jewelry, hard drives, cash, heirlooms — and lay it out on a table. Measure the footprint and the height of the tallest item. This is your starting volume, and most people are surprised how fast it adds up.
Collections grow. Paperwork accumulates. The firearm you buy next year needs a slot too. A good rule: whatever space today's items need, add 30% or more on top. An extra shelf now is far cheaper than a second safe later.
Rule of thumb: if your layout needs about 3 cubic feet today, shop for a safe with at least 4 cubic feet of usable interior.
Fire-rated walls are thick. A safe that measures 24 inches wide outside can have far less usable width inside — insulation and steel eat 2 to 4 inches per side on many models. Always check the interior dimensions and interior cubic feet in the spec table, not the outside measurements.
The scoped-rifle rule: a “24-gun” safe realistically holds 10–14 rifles once scopes, bipods and pistol grips enter the picture.
Quality safes commonly run from a few hundred pounds to well over a thousand. Before you choose, pick the spot — the spot often decides the size.
Ground floor or a concrete slab is ideal for heavier models. For upper floors, check your floor's load capacity before committing to a 900 lb safe.
Leave room for the door to swing fully open, plus space to stand beside it. A safe you can't comfortably open gets used less.
Put it against a wall where it can be bolted down. Anchoring is what stops a safe from being tipped over or walked out the door.
Measure your door widths, hallway turns, and any stairs on the route from the curb to the safe's final spot. Freight shipping is free on orders over $499, and when your safe ships we hand it to our nationwide delivery partner, In the Nick of Time, who manages curbside delivery, liftgate service, and lead-time scheduling with you directly. Inside delivery isn't included, so line up help (or a local mover) for the final move from the curb.
Walk the route from the curb to the safe's final spot and record the tightest point of each. Compare every number against the safe's exterior dimensions plus about 2″ of clearance.
Tip: screenshot this filled-in checklist and keep it with your order confirmation — it's exactly what a mover will ask for.
Check everything you plan to protect. We'll point you at the right size class — growth room already included.
Select at least one item above to see a recommendation.
| What you're protecting | What to look at |
|---|---|
| Documents, passports, a pistol or two | Compact home safe, roughly 1–2 cu ft interior |
| Documents + jewelry + drives + cash | Mid-size home safe, roughly 2–5 cu ft interior |
| Long guns (check the scoped-rifle rule above) | Gun safe sized by realistic capacity and interior height |
| Business cash or high-value items | Burglary-rated (TL-15 / TL-30) or depository safe |
Multiply the footprint's width × depth × the height of your tallest item (all in inches), then divide by 1,728. Example: 30″ × 14″ × 12″ = 5,040 ÷ 1,728 ≈ 2.9 cu ft. Add 30% and you're shopping for roughly 4 cu ft of interior.
Paper chars around 420°F, so look for a genuine fire rating (60–120 minutes is typical for home safes). For digital media and drives, interior temperatures need to stay far lower — a fire-rated safe with a media-rated inner box, or a dedicated data safe, is the safer route.
Measure your longest firearm including muzzle devices. Most gun safes list interior height in the spec table; some models offer barrel-up/barrel-down racking or corner racks that buy you extra inches. If you're within an inch or two, call us — we'll check the exact model.
Often yes — residential floors are commonly built for 40 lb per square foot of live load, and a safe spreads its weight over its footprint near a wall. But above roughly 700–800 lb, or in older homes, have the floor checked. Placing the safe against a load-bearing wall and across joists helps significantly.
Only when the delivery path can't take it or the floor can't hold it. That's why Steps 4 and 5 come before checkout. If the biggest safe that fits your path is smaller than your contents need, two safes in different locations can be the right answer — and it's a nice security bonus, too.
Tell us what you're protecting and your budget, and we'll shortlist two or three models that fit — sized right the first time.
Call (888) 717-48198:00 AM–8:00 PM ET, 7 days a week — or use the live chat on this site.