The Königs were armed with a main battery of ten 30.5 cm SK L/50 guns in five twin turrets.
Two turrets were mounted forward of the main superstructure in a superfiring pair, the third was placed on the centerline between the two funnels amidships, and the fourth and fifth turrets were arranged in another superfiring pair aft of the rear conning tower.
The centerline arrangement was an improvement over the preceding Kaiser class, as all ten guns could fire on a wide arc on the broadside, and four guns could fire directly ahead, as opposed to only two on the Kaisers.
The guns were supplied with 90 shells per gun, and they had a rate of fire of about three shots per minute.
The barrels had an expected life of two hundred full-power shots before they would need to be replaced.

The guns were mounted in DrL C/11 turrets, which were electrically controlled, though the guns were elevated hydraulically.
Each turret had a working chamber beneath it that was connected to a set of revolving ammunition hoists leading down to the magazine below it.
One set of hoists retrieved the shells and propellant charges from the magazines and brought them to the working chamber, and  another transferred them up to the gun house through flash-tight doors; this arrangement was adopted to reduce the risk of fire in the gun house from reaching the magazines.
In an effort to reduce the possibility of a fire, everything in the turret was constructed of steel.
The guns had a range of elevation from -8 to 15.5 degrees, which provided a maximum range of 16,200 m (53,100 ft).
Later in their careers, their mounts were modified to increase maximum elevation at the expense of depression, with the range now -5.5 to 16.5 degrees, increasing their range to 20,400 m (66,900 ft).
Muzzle velocity was 855 m/s (2,810 ft/s).

Secondary armament consisted of fourteen 15 cm SK L/45 quick-firing guns, each mounted individually in casemates in the forecastle deck, seven guns per broadside.
Each casemate had its own set of magazines and ammunition hoists.
These guns were intended for defense against torpedo-armed destroyers, and were supplied with a total of 2,240 shells.
Their rate of fire was 4 to 5 shots per minute.
The guns could depress to −7 degrees and elevate to 20 degrees, for a maximum range of 13,500 m (14,800 yd).
Their muzzle velocity was 835 m/s (2,740 ft/s).

The ships also carried six 8.8 cm SK L/45 quick-firing guns, mounted in casemates; previous German capital ships had carried a larger number of these guns, but by the time the König class was designed, the growth of destroyers had rendered the 8.8 cm gun of marginal use.
The six guns were located on either side of the forward conning tower and were all directed forward.
These guns were supplied with a total of 3,200 rounds, or 200 shells per gun, The guns could be elevated up to 25 degrees for a maximum range of 10,694 m (35,085 ft).
In addition, they were slated to carry four 8.8 cm SK L/45 anti-aircraft guns, which were to be mounted on either side of the rear conning tower.
Production remained behind schedule and competing demands after the start of the war caused further delivery problems.
Grosser Kurfürst received her original complement in 1915 and König and Kronprinz had two guns installed that year.
Kronprinz had another pair installed by 1918, by which time Markgraf received two of the guns.

As was customary for capital ships of the dreadnought era, the ships were armed with five 50 cm (19.7 in) submerged torpedo tubes, which were supplied with a total of sixteen torpedoes.
One tube was mounted in the bow and the other four were placed on the broadside, two on each side of the ship.
The torpedoes were the G7*** type, which carried a 195 kg (430 lb) warhead.
They could be set at three speeds: 35 knots (65 km/h; 40 mph) for a range of 5,000 m (5,468 yd), 28.5 knots (52.8 km/h; 32.8 mph) for a range of 10,700 m (11,702 yd), or 25.5 knots (47.2 km/h; 29.3 mph) for a range of 12,510 m (13,680 yd).
The Königs were armed with a main battery of ten 30.5 cm SK L/50 guns in five twin turrets. Two turrets were mounted forward of the main superstructure in a superfiring pair, the third was placed on the centerline between the two funnels amidships, and the fourth and fifth turrets were arranged in another superfiring pair aft of the rear conning tower. The centerline arrangement was an improvement over the preceding Kaiser class, as all ten guns could fire on a wide arc on the broadside, and four guns could fire directly ahead, as opposed to only two on the Kaisers. The guns were supplied with 90 shells per gun, and they had a rate of fire of about three shots per minute. The barrels had an expected life of two hundred full-power shots before they would need to be replaced.
The guns were mounted in DrL C/11 turrets, which were electrically controlled, though the guns were elevated hydraulically. Each turret had a working chamber beneath it that was connected to a set of revolving ammunition hoists leading down to the magazine below it. One set of hoists retrieved the shells and propellant charges from the magazines and brought them to the working chamber, and  another transferred them up to the gun house through flash-tight doors; this arrangement was adopted to reduce the risk of fire in the gun house from reaching the magazines. In an effort to reduce the possibility of a fire, everything in the turret was constructed of steel. The guns had a range of elevation from -8 to 15.5 degrees, which provided a maximum range of 16,200 m (53,100 ft). Later in their careers, their mounts were modified to increase maximum elevation at the expense of depression, with the range now -5.5 to 16.5 degrees, increasing their range to 20,400 m (66,900 ft). Muzzle velocity was 855 m/s (2,810 ft/s).
Secondary armament consisted of fourteen 15 cm SK L/45 quick-firing guns, each mounted individually in casemates in the forecastle deck, seven guns per broadside. Each casemate had its own set of magazines and ammunition hoists. These guns were intended for defense against torpedo-armed destroyers, and were supplied with a total of 2,240 shells. Their rate of fire was 4 to 5 shots per minute. The guns could depress to −7 degrees and elevate to 20 degrees, for a maximum range of 13,500 m (14,800 yd). Their muzzle velocity was 835 m/s (2,740 ft/s).
The ships also carried six 8.8 cm SK L/45 quick-firing guns, mounted in casemates; previous German capital ships had carried a larger number of these guns, but by the time the König class was designed, the growth of destroyers had rendered the 8.8 cm gun of marginal use. The six guns were located on either side of the forward conning tower and were all directed forward. These guns were supplied with a total of 3,200 rounds, or 200 shells per gun, The guns could be elevated up to 25 degrees for a maximum range of 10,694 m (35,085 ft). In addition, they were slated to carry four 8.8 cm SK L/45 anti-aircraft guns, which were to be mounted on either side of the rear conning tower. Production remained behind schedule and competing demands after the start of the war caused further delivery problems. Grosser Kurfürst received her original complement in 1915 and König and Kronprinz had two guns installed that year. Kronprinz had another pair installed by 1918, by which time Markgraf received two of the guns.
As was customary for capital ships of the dreadnought era, the ships were armed with five 50 cm (19.7 in) submerged torpedo tubes, which were supplied with a total of sixteen torpedoes. One tube was mounted in the bow and the other four were placed on the broadside, two on each side of the ship. The torpedoes were the G7*** type, which carried a 195 kg (430 lb) warhead. They could be set at three speeds: 35 knots (65 km/h; 40 mph) for a range of 5,000 m (5,468 yd), 28.5 knots (52.8 km/h; 32.8 mph) for a range of 10,700 m (11,702 yd), or 25.5 knots (47.2 km/h; 29.3 mph) for a range of 12,510 m (13,680 yd).
König-class battleship