Convert Minecraft speed to real world speed:
How to convert a Minecraft mob’s in-game speed (igs) to real world speed (rls) per seconds in meters. In Minecraft every block in all angles is equal to 1 meter or 3.28 feet. To convert this first find what is the generic movement speed attribute of the mob then multiply that by 43. The result is how many in-game blocks can a mob move per second. The following step has already been completed for you using the real life average human speed of 1.42 meters (4.66 feet) per second and the default in-game player 4.3 blocks per second then divided by each other to get the result of 0.33. With all this information, you should now be able to convert any mob’s speed using the provided formula below!
(igs x 43) x 0.33 = rls

Convert Minecraft size to real world size:
How to convert a Minecraft area in-game size (b) to real life world size (rlw) in meters. In Minecraft every block in all angles is equal to 1 meter or 3.28 feet but when calculated by igs vs rls on the same amount of generic meters there is a big difference meaning that the b in meters will not at all be the same as rlw in meters and this is where conversion is needed to have an appropriate rlw. To convert we will be relying on the igs to rls conversion. The following step has already been completed for you using the real life average human speed of 1.42 meters (4.66 feet) per second and the default in-game player 4.3 blocks per second then divided by each other to get the result of 0.33. With all this information, you should now be able to convert any size structure or world using the provided formula below!
0.33 x b = rlw