Before we tell you how to replace a toilet flange, we must be sure that you have properly identified the problem. It's a lot of work, and you don't want to start the project if it's not necessary.
Also referred to as a closet flange, this metal fitting connects the toilet to the drain pipe with a wax ring sealing the deal. A flange doesn't necessarily need to be replaced, it can be reinforced with a closet ring.
If water is leaking from the base of your toilet, then I have bad news for you...you might need to replace your toilet flange. The good news is this part is affordable but is it's not a fun job to perform. You will want to catch any issue before it becomes a leak, so in this case you would look for poor anchoring (the bolts may be bent, or may have stripped out the slot). Check to see if the toilet rocks.
If the toilet is rocking then it will eventually lead to a break in the seal. The seal is made of wax and is designed to mold into place and fill any uneven surfaces. If your toilet is rocking and/or moving it will smash the beeswax, making it thinner and thinner until it no longer functions as designed. This is a serious problem because often toilets leak slow enough that it goes unnoticed underneath the flooring causing structural damage before you are aware it's there. Once the sub-flooring gets waterlogged it will swell and begin to flake apart, but because it is usually covered with tile or linoleum all the damage goes unseen. Though water around your toilet could mean you need a new flange, more often than not it will be the supply lines and shut off valves and not the flange.
If the toilet does not rock, then you probably don't need to replace the flange. If it does rock, try tightening the bolts (be careful not to tighten too much and crack the bowl). If they don't tighten, then you will need to replace the flange.
Hopefully, this guide on how to replace a toilet flange will prove helpful with your plumbing project. Please give us feedback. Thanks for visiting PlumbersStock, and please share your project with us on social media. If you are wanting to update your toilet seat, tank, etc., we have plenty of deals.