Soviet Anti-Tank Belt Calculations
(Uploaded July 2016)

References:
TM 30-430 Handbook on USSR Military Forces, 1 November 1945
Kursk: Hitler's Gamble, 1943 by Walter Scott Dunn (Mentioned)

Soviet Anti-Tank Belt Equation

G = (T * K) / (S * (A/B) )

where

G = Guns needed per kilometer of frontage
T = number of enemy tanks expected to attack 1 km of front
K = number of rounds required to stop one enemy tank
S = number of rounds fired per minute
A = maximum distance at which a tank can be destroyed (meters)
B = distance a tank can move in one minute (meters)

B can be found using this list:

5 km/h = Approx. 80 meters per minute (Dismounted Infantry on Foot)
10 km/h = Approx. 170 meters per minute
15 km/h = Approx. 250 meters per minute
20 km/h = Approx. 330 meters per minute (WWII Tanks)
25 km/h = Approx. 420 meters per minute
30 km/h = Approx. 500 meters per minute (1970s and later Tanks)

Example 1 (WWII Anti Tank Guns)

Fifty enemy tanks are to attack, and on average 4 rounds are needed to destroy them.

The anti-tank guns can fire 10 rounds per minute and can kill the tanks at 600 meters, while the average cross-country distance the enemy tanks can move in one minute is 300 meters.

G = (50 * 4) / (10 * (600/300) ) = 10 Anti Tank Guns needed

Example 2 (Modern ATGMs)

Fifty enemy tanks are to attack, and on average 1.15 ATGMs are needed to destroy them.

The ATGM launchers can fire 2 missiles per minute and can kill the tanks at 3,000 meters, while the average cross-country distance the enemy tanks can move in one minute is 500 meters.

G = (50 * 1.15) / (2 * (3000/500) ) = 4.79 ATGM Launchers needed