There is no doubting Glock’s popularity among new and old handgun shooters. If you’re newer to gun ownership, you may be wondering: how many rounds does a Glock hold?

We break down how many bullets each Glock handgun magazine holds so you can be armed with the information you need to make a smart pistol purchase.

How Many Rounds Does a Glock Have – Glock Capacity Chart

The amount of rounds that a Glock holds will depend on the caliber and model. The following chart shows the standard and optional magazine capacities of the Glock pistol lineup.

Model	Caliber	Standard Capacity	Optional Capacity
Glock 17	9mm	17	19, 24, 31, 33
Glock 19	9mm	15	17, 19, 24, 31, 33
Glock 19X	9mm	17	19, 24, 31, 33
Glock 26	9mm	10	12, 15, 17, 19, 24, 31, 33
Glock 34	9mm	17	19, 24, 31, 33
Glock 43	9mm	6	n/a
Glock 43X	9mm	10	n/a
Glock 45	9mm	17	19, 24, 31, 33
Glock 48	9mm	10	n/a
Glock 44	.22LR	10	n/a
Glock 22	.40S&W	15	16, 22
Glock 23	.40S&W	13	14, 15, 16, 22
Glock 24	.40S&W	15	16, 22
Glock 27	.40S&W	9	10, 15, 16, 13, 14, 22
Glock 35	.40S&W	15	16, 22
Glock 20	10mm	15	n/a
Glock 29	10mm	10	15
Glock 40	10mm	15	n/a
Glock 21	.45ACP	13	n/a
Glock 30	.45ACP	10	9, 13
Glock 36	.45ACP	6	n/a
Glock 41	.45ACP	13	n/a
Glock 37	.45 G.A.P.	10	n/a
Glock 38	.45 G.A.P.	8	10
Glock 39	.45 G.A.P.	6	8, 10
Glock 42	.380ACP	6	n/a
Glock 31	.357 SIG	15	16
Glock 32	.357 SIG	13	14, 15, 16
Glock 33	.357 SIG	9	10, 15, 16, 13, 14

These numbers are for the magazine capacity. This means that technically, each of these pistols can hold one additional round, which would be the round in the chamber. For example, the Glock 17 has a standard capacity magazine of 17 rounds. If you were to chamber a round, then remove the magazine and replace it with a fully loaded magazine, the Glock 17’s capacity would then be 17+1 in the chamber for a total of 18 rounds.

Some states have magazine capacity limits. For example, gun owners in California, Connecticut, D.C., Hawaii, Maryland, Massachusetts, New Jersey, and New York are limited to no greater than 10 round magazines. Those in Colorado and Vermont are limited to 15 round magazine capacities for their handguns. 

9mm Glock Capacity

Glock produces nine different guns that shoot 9mm ammo, including some of their most popular models. The 9mm Glock models include the G17, G19, G19X, G26, G34, G43, G43X, G45, and G48. Let’s take a look at how many rounds each holds.

Model	Caliber	Standard Capacity	Optional Capacity
Glock 17	9mm	17	19, 24, 31, 33
Glock 19	9mm	15	17, 19, 24, 31, 33
Glock 19X	9mm	17	19, 24, 31, 33
Glock 26	9mm	10	12, 15, 17, 19, 24, 31, 33
Glock 34	9mm	17	19, 24, 31, 33
Glock 43	9mm	6	n/a
Glock 43X	9mm	10	n/a
Glock 45	9mm	17	19, 24, 31, 33
Glock 48	9mm	10	n/a

How Many Rounds does a Glock 17 Hold?

The Glock 17 magazine standard capacity is 17 rounds plus one round in the chamber. Optional magazine capacities include 19, 24, 31, and 33 rounds.

How Many Rounds does a Glock 19 Hold?

The Glock 19 magazine standard capacity is 15 rounds plus one round in the chamber. Optional magazine capacities include 17, 19, 24, 31, and 33 rounds.

How Many Rounds does a Glock 43 Hold?

The Glock 43’s standard magazine holds 6 rounds plus one round in the chamber.

How Many Rounds does a Glock 43X Hold?

The Glock 43X holds 10 rounds plus one in the chamber in its standard capacity magazines.

How Many Rounds Does a Glock 26 Hold?

The Glock 26 holds 10 rounds in its standard capacity magazine plus an additional round in the chamber. Optional magazine capacities include 12, 15, 17, 19, 24, 31, and 33 rounds.

.40S&W Glock Capacity

Glock currently has five pistols chambered in .40S&W: G22, G23, G24, G27, and G35. They range in standard capacity from 9 rounds to 15 rounds, but optional magazines size up to 22 rounds.

Model	Caliber	Standard Capacity	Optional Capacity
Glock 22	.40S&W	15	16, 22
Glock 23	.40S&W	13	14, 15, 16, 22
Glock 24	.40S&W	15	16, 22
Glock 27	.40S&W	9	10, 15, 16, 13, 14, 22
Glock 35	.40S&W	15	16, 22

How Many Rounds does a Glock 23 Hold?

The Glock 23 holds 13 rounds in its standard capacity magazine, but optional magazines hold 14, 15, 16, and 22 rounds of .40S&W ammo.

10mm Glock Capacity

The lineup of 10mm Glocks are the G20, G29, and G40. They range in capacities from ten rounds to 15 rounds.

Model	Caliber	Standard Capacity	Optional Capacity
Glock 20	10mm	15	n/a
Glock 29	10mm	10	15
Glock 40	10mm	15	n/a

.45ACP Glock Capacity

The G21, G30, G36, and G41 are all of the Glocks chambered in .45ACP. The G36 has the lowest capacity, holding 6 rounds of .45ACP ammo, while the G21 has the largest standard capacity magazine of 13 rounds.

Model	Caliber	Standard Capacity	Optional Capacity
Glock 21	.45ACP	13	n/a
Glock 30	.45ACP	10	9, 13
Glock 36	.45ACP	6	n/a
Glock 41	.45ACP	13	n/a

.45 G.A.P. Glock Capacity

The .45 G.A.P. is a caliber designed by Glock and Speer in order to shorten the length of the .45 ACP round while keeping a similar energy level. Glock has three pistols chambered in .45 G.A.P.: G37, G38, and G39. They range in magazine capacities from six rounds up to ten rounds.

Model	Caliber	Standard Capacity	Optional Capacity
Glock 37	.45 G.A.P.	10	n/a
Glock 38	.45 G.A.P.	8	10
Glock 39	.45 G.A.P.	6	8, 10

.357 SIG Glock Capacity

The three Glocks chambered in .357 SIG are the G31, G32, and G33.

Model	Caliber	Standard Capacity	Optional Capacity
Glock 31	.357 SIG	15	16
Glock 32	.357 SIG	13	14, 15, 16
Glock 33	.357 SIG	9	10, 15, 16, 13, 14

Glock Magazine Extensions

Besides the magazines that Glock offers, there are other options to add more rounds to your Glock magazine. A magazine extension is a piece of aluminum and a magazine spring that replace the factory basepad and spring of your magazine. This adds room for extra rounds in your magazine. Companies like Springer Precision and Shield Arms offer magazine extensions that can add up to five additional rounds to some 9mm Glock magazines.

Aftermarket Glock Magazines

Some companies offer aftermarket Glock magazines with larger ammo capacities than Glock factory magazines. For example, Elite Tactical Systems produces clear polymer magazines in various calibers and capacities that you might not see from Glock.

Magpul offers a 50-round drum magazine that is compatible with double stack 9mm Glocks.

How Many Rounds Do You Need?

Now you may be wondering, “how many rounds should I carry?” It’s impossible to say how many rounds you need. The type of gun you are able to comfortably carry will play a role in how many rounds you can carry in one magazine. It’s not a bad idea to have a second magazine on you, no matter how many rounds your gun holds. That way, you will have spare rounds if you need them and you have a backup magazine in the case you have a magazine failure. Just be sure you practice your reloads!