How Much Does a Bathtub Weigh?
Weight by material, from cast iron to acrylic
A cast iron bathtub weighs 300 to 500 pounds; a standard 5-foot alcove tub is about 320. Acrylic and fiberglass tubs are a different animal, just 50 to 100 pounds, light enough for one person to carry out. The material decides everything here: whether you need a crew and a plan, or a helper and a pickup truck.
Bathtub weight at a glance
Weights are for empty tubs. Cast iron is the outlier; every other common tub material comes in under about 150 pounds.
Bathtub weight by material
Five materials cover almost every tub you'll pull out, and they split into two groups: cast iron in a heavy class of its own, and everything else light enough to hand-carry. The weight also tells you the removal plan before you touch a tool.
| Tub type | Empty weight | Removal reality |
|---|---|---|
| Fiberglass | 50–70 lbs | One person; cuts easily with a jigsaw |
| Acrylic | 60–100 lbs | One person; flexes, thicker than fiberglass |
| Porcelain-enameled steel | 60–120 lbs | One or two people; awkward but liftable |
| One-piece tub-shower combo | 100–150 lbs | Bulky; usually cut apart to clear the door |
| Cast iron, 5-ft alcove | 300–350 lbs | Two to three people, or break in place |
| Cast iron, freestanding / clawfoot | 250–500 lbs | Two to three people; no flat side to grip |
Oversized soaking and whirlpool tubs sit above these ranges; a large cast iron soaker can top 500 pounds empty, and any tub gets heavier once you count water left in the trap.
Why cast iron is in its own class
A 5-foot cast iron tub holds 300-plus pounds because the shell is solid iron, roughly a quarter-inch to three-eighths thick, with a fused porcelain enamel coating on top. Iron runs about 450 pounds per cubic foot, and a tub packs a lot of it into the walls, floor, and rolled rim. Acrylic and fiberglass tubs are thin thermoformed shells, a fraction of the mass for the same shape. That single difference, iron versus plastic, is why one tub needs a crew and the other rides out on a shoulder.
Breaking a cast iron tub beats carrying it.
A 350-pound tub does not belong on a staircase in one piece. On an upper floor, break it where it sits: drape a moving blanket to catch shards, wear eye protection and gloves, and crack it with a sledgehammer, or cut it into sections with a reciprocating saw and a metal-cutting blade. Carry the pieces out by hand. Trying to walk a whole cast iron tub down stairs is how backs and feet get hurt.
What this means when you rent a dumpster
One tub never overweights a dumpster. Even a 500-pound cast iron tub is a quarter of a small container's weight allowance, so a bathtub is a handling and placement problem, not a weight-cap problem. In a full bathroom gut, the tile and mortar bed are what fill the weight limit; the tub barely moves the needle.
We recommend keeping cast iron out of the dumpster entirely. It's clean scrap iron, and most yards take it; many pay 50 to 100 dollars, and some will grab it from the curb for free once it's at ground level. Call a scrap yard before you size up to a bigger container just to fit a tub you could sell instead. Don't pay landfill rates to bury metal someone wants.
Light tubs are the opposite case: acrylic, fiberglass, and steel are volume, not weight. A single one fits in a pickup bed, and plenty of towns take it as bulk trash pickup. So rent a dumpster when the tub rides along with a full remodel, drywall, tile, vanity, and flooring all coming out together, and size that container for the debris load. The tub itself is a rounding error against the tile.
Reference Sources
Tub weights come from manufacturer product specifications, since there's no government or trade-association standard for how much a bathtub weighs. Cast iron figures track the published shipping weights for common 5-foot models; the lighter ranges come from thermoformed acrylic, fiberglass, and enameled-steel tub specs across major brands.
- Cast iron weights: Kohler cast iron bathtub specifications, where 5-foot alcove models list product weights near 300 to 340 pounds (for example the Villager at roughly 294 and the Bellwether at roughly 335).
- Acrylic, fiberglass, and steel weights: Kohler and other manufacturer bathtub product data, where thermoformed and enameled-steel tubs list empty weights of roughly 50 to 120 pounds.
Related Pages
The tub is one piece of the debris. These tools size a container for the whole job it's part of.
Common questions
How much does a cast iron bathtub weigh?
300 to 500 pounds. A standard 5-foot alcove tub averages about 320; a freestanding or clawfoot tub can reach 500. That makes it a two or three-person move, and on an upper floor it's often easier to break the tub in place than carry it out whole.
How much does an acrylic or fiberglass bathtub weigh?
Acrylic is 60 to 100 pounds, fiberglass 50 to 70, so both are a one-person carry. Acrylic runs a little heavier since it's thicker and often reinforced. A one-piece tub-shower combo is light for its size (100 to 150 pounds) but bulky enough that it usually gets cut apart to clear the doorway.
Do I need a dumpster to remove a bathtub?
Not for the tub by itself. A light acrylic or fiberglass tub fits in a pickup bed or a curbside bulk pickup, and a cast iron tub is better sent to a scrap yard than a dumpster. Rent a container when the tub is part of a full bathroom gut, and size it for the tile, drywall, and vanity debris.
How do you remove a heavy cast iron tub?
Break it in place or cut it into sections. Drape the tub with a moving blanket to catch shards, wear eye protection and gloves, and crack it with a sledgehammer, or cut it with a reciprocating saw and a metal-cutting blade. Carry the pieces out by hand. For a whole tub, plan on two or three people, and don't walk it down a staircase.
Disclaimer: These are empty-tub weights for common residential bathtubs. Actual weight varies by brand, size, and model; oversized soaking and whirlpool tubs run heavier, and old cast iron can surprise you. Before you plan an upper-floor removal or hire a crew, weigh the tub against your access, since getting it out is usually harder than the pounds suggest. This is general information, not professional or legal advice. See the Terms of Use for full terms and disclaimers.