A toilet that rocks is either loose at the two bolts that hold it to the floor or sitting on an uneven floor. Snug the bolts a little at a time, alternating sides, and stop when they are firm. If it still rocks, slide plastic toilet shims under the low side and trim them. Fix it soon: a rocking toilet can break the wax seal underneath.
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The part most wobbly toilets need: plastic toilet shims. Check Wobble Wedge shims on Amazon
First, Check for a Leak
Look for water, staining or a sewer smell at the base, and press on the floor around the toilet with your foot. A rocking toilet can break the wax seal, and Wobble Wedge, the shim maker, notes that it can lead to floor damage. If the base is wet or the floor feels soft, stopping the rock is not enough: see toilet leaking at the base, and read the plumber section below about a soft floor.
How to Fix a Toilet That Rocks
- Snug the closet bolts. Pop off the plastic caps at the base. If the nuts are loose, tighten them a quarter turn at a time, alternating sides, and stop as soon as they are firm. Overtightening is the classic way to crack the porcelain, so do not crank them to stop a rock.
- If it still rocks, shim it. Rock the toilet gently to find the side with the gap. Slide plastic toilet shims under the base there until the toilet sits solid, then snug the bolts again, alternating sides. Wobble Wedge recommends soft plastic shims because they cushion the porcelain.
- Trim the shims. Cut off the exposed ends with a utility knife so they sit flush with the base.
- Do not use caulk to stop a rock. Caulk does not hold a toilet steady, and Wobble Wedge notes that caulking the base can hide leaks. Whether to caulk at all is up to your toilet maker’s instructions.
If the Bolts Spin or Will Not Tighten
A nut that spins without tightening usually means the bolt has slipped out of its slot in the toilet flange or the flange itself is broken. That fix means pulling the toilet, repairing the flange and setting it on a new wax ring. Start with our guides to a toilet flange that is too low and how to replace a toilet wax ring.
I send an occasional note when a new guide goes up — repairs worth doing yourself, and the parts that actually last. No spam, no course funnel; written by a licensed Georgia plumber.
Parts That Fix It
Each part below was sold or shipped by Amazon, new and in stock, when we checked on September 23, 2026; details come from each Amazon listing.
- Toilet shims. Wobble Wedge flexible plastic shims, clear, 30-pack: the listing says they fix a tilting or wobbly toilet and can be trimmed to fit.
- A wax ring, if you have to pull the toilet. Eastman 40145 jumbo wax ring with flange: per the listing it is 1-1/4 inches thick, fits 3-inch or 4-inch waste lines and is meant for when a regular ring does not provide enough wax. Our wax ring guide compares it with the other options.
When to Call a Licensed Plumber
- The floor around the toilet is soft, spongy or stained. That can mean the subfloor is rotting, and the repair goes beyond the toilet.
- The flange is cracked or broken, especially a cast-iron flange, and you are not comfortable pulling and resetting the toilet.
- Water still shows at the base after the bolts are snug and the toilet is shimmed.
- The porcelain is cracked. A cracked bowl or base gets replaced, not repaired; our best toilet picks list the rough-in, height and flush limit to check before you buy one.
FAQ
Is a wobbly toilet a big deal?
Yes, fix it soon. A toilet that rocks can break its wax seal, which lets water and sewer gas out at the base, and Wobble Wedge notes a rocking toilet can lead to floor damage. Tightening the bolts or shimming it takes a few minutes.
How tight should toilet bolts be?
Snug, not cranked. Tighten the nuts in small, alternating turns until they are firm, then stop. Porcelain cracks if the bolts are overtightened, so if the toilet still rocks, shim it instead of tightening further.
Should I caulk around a wobbly toilet?
Caulk does not fix a rocking toilet; shims do. Wobble Wedge notes that caulking the base can hide a leak; whether to caulk at all is up to your toilet maker’s instructions.
Why Trust Plumbing Picks
Plumbing Picks is written by a Journeyman Plumber — State of Georgia Licence #JP507711 — and the license is verifiable through the Georgia Secretary of State’s license verification portal. The steps on this page follow the manufacturer sources listed below, and product details come from the Amazon listing, not from hands-on testing. Nobody pays to be included here. Where a link goes to Amazon we may earn a commission at no extra cost to you. More on who writes this and how we pick.
Sources
Bottom Line
Snug the closet bolts in small alternating turns, then shim any gap with soft plastic toilet shims and trim them flush. If the bolts spin, the base is wet or the floor is soft, the fix is under the toilet: a flange repair and a new wax ring, or a licensed plumber.