What Size Cordless Caulk Gun Do You Need?
For most home jobs, including showers, tubs and windows, you need a gun that fits a standard 10 oz cartridge. Only choose a larger gun, built for 28 to 29 oz cartridges, if you have long exterior runs or a lot of sealant to lay down. One caution: none of the top ten guns on our comparison page run on a battery, so true cordless models are a separate category.
WORKPRO W024006Best overall
Cocew scraper varKit with scraper included
Newborn 250Steel frame, 18:1 thrustStart with the cartridge, not the gun
Caulk guns are sized by the cartridge they hold. Cartridge size is the number that decides whether a gun fits your sealant, so check the tube label before you shop.
The standard tube is 10 oz, and it covers the bathroom, kitchen, trim and window jobs most homeowners do. Larger cartridges, usually labeled 28 or 29 oz, show up on bigger exterior projects. A gun built for one size will not hold the other, so match the two before you buy.
A quick note on "cordless"
True cordless caulk guns run on a battery and push the sealant without hand squeezing. Our best cordless caulk gun page is upfront about this: none of the ten products on it are battery-powered. All are manual guns.
If battery power is a firm requirement, look in a separate battery-powered category. If a manual gun is fine for you, the same sizing rules below still apply, and the specs on that page can help you cut hand fatigue.
Which size fits which job
Think about how much sealant you will use and where you will use it. A tub surround takes far less than a house perimeter.
| Cartridge size | Typical jobs | What to look for |
|---|---|---|
| 10 oz (standard) | Showers, tubs, sinks, windows, baseboards, small repairs | Light weight, drip control, smooth rod |
| 28 to 29 oz (large) | Long exterior runs, siding, large projects | Higher thrust, comfortable grip, patience with the extra weight |
| Sausage packs (soft foil) | Commercial or high-volume work | A gun made for sausage packs, not a standard frame |
What size for a 10 oz cartridge
Every product in our top ten that lists a cartridge size takes 10 oz cartridges except one, which takes 29 oz. That tells you how common the 10 oz format is. If your tube is a standard size, you have plenty of choices.
Weight varies a lot within that group. Among the models that list weight, the range runs from 0.625 lb to 3 lb. Our top pick lists 0.625 lb and a 10 oz capacity, while another 10 oz option lists 1.76 lb. If you work above your head, the lighter end will be easier on your arm.
What size for a 28 oz cartridge
A 28 oz tube needs a full-size gun. A standard 10 oz frame will not hold it, so do not try to force the fit.
On our page, the one model that lists a 29 oz capacity also lists an 18:1 thrust ratio and a weight of 2.44 lb. That is a good example of the tradeoff. Bigger cartridges mean fewer reloads on long runs, but the gun and the loaded tube are heavier to hold for long stretches.
If you are not sure you need that much sealant, a 10 oz gun and a few tubes is often easier to handle.
What size for a shower
A shower is a 10 oz job. You will use one or two tubes at most, and you need control more than capacity. Silicone sealants are thin, so a lower or switchable thrust ratio works well.
For example, our top pick switches between 18:1 and 9:1, with the lower setting meant for acrylic materials. Another model switches between 20:1 and 10:1, with the lower setting suited to silicone. Drip control also helps in a tight, wet space, because it stops flow between passes.
A rotating barrel keeps the bead on target around corners, which matters in a shower.
Other specs to check once you know the size
After cartridge size, these specs shape how the gun feels:
- Thrust ratio: higher numbers, such as 26:1, push thick adhesives with less effort. Lower numbers, such as 8:1, suit thin sealants. A switchable gun covers both.
- Rod type: a smooth rod needs less effort and makes less noise than a ratchet rod.
- Drip control: this stops the flow between passes so beads stay clean.
- Built-in tools: a spout cutter and a seal puncture tool save you from carrying extras. Some models add a ladder hook.
Safety notes
Wear safety glasses, especially when you caulk overhead. Sealant can drip or squirt without warning.
Open windows and run a fan when you use silicone or adhesives, and read the label for ventilation advice. If you work from a ladder, set it on level ground and use a ladder hook or a belt to keep the gun secure. Release the plunger pressure before you remove a cartridge.
Frequently asked questions
Can I use a 10 oz gun with a larger cartridge?
No. The frame is built for one cartridge size, so a 28 or 29 oz tube needs a gun made for it.
Is a higher thrust ratio always better?
Not always. High ratios suit thick adhesives, while lower ratios give better control with thin sealants such as silicone. A switchable gun lets you choose.
Does a heavier gun mean a better gun?
No. Weight mostly affects fatigue. Among listed models, weights range from 0.625 lb to 3 lb, so a lighter gun is easier for ceilings and long runs.
Do I need a spout cutter?
It is handy. Several models include a built-in spout cutter and seal puncture tool, which means fewer separate tools to carry.