Build converting to actual size

[JasonW]

I am not sure if this is mentioned in the 7e rule book or not but is there any way to relate Build to actual size in dimensions???

I know page 145 gives you build in terms of vehicle sizes eg build 32 would be the size of a cruise ship, is there anywhere else?

 

 

 

[nclarke]

Not Build but BRP 4e page 26 has a chart that gives height and weight ranges for all SIZ up to 25 (p277 has a table for SIZ of various objects that probably mirrors the  table in 7e).

Build can be extrapolated from SIZ+STR as per the table on p33 of the 7e Keeper's book. Build 9  (a Giant Snake from Two -Headed Serpent is 100 feet long by 4 feet in diameter & STR 300, SIZ 400) is SIZ+STR 685-744 from the table for example and almost every creature has at least a STR and SIZ in the Keeper book or Malleus Monstrorum. If it's inanimate objects you're seeking then you might have to fudge it via the BRP 4e book.

Working backwards is fairly simple mathematics

[Atgxtg]

The BRP SIZ table is messed up though. It's a cut & paste from older edtions of CoC which in turn a messed up and taken from RQ3. The RQ3 table is a modified version of the Superworld SIZ table. 

With some info on the CoC Build stat and table (I think I got it, somewhere), I could probably work up a relationship to dimensions based on mass, but that would be mostly good for people and animals - and maybe some Mythos creatures. Vehicles are a bit tougher, since they are not solid objects and have a good deal on empty space. For instance a 60 ton airship is going to be a lot (like 5000 times) bigger that a 60 ton tank.

[Arnold-C]

On ‎10‎.‎08‎.‎2017 at 4:54 PM, Atgxtg said:

The BRP SIZ table is messed up though. It's a cut & paste from older edtions of CoC which in turn a messed up and taken from RQ3. The RQ3 table is a modified version of the Superworld SIZ table.

The BRP SIZ Table in the BGB is a cut-down version of the SIZ Table published in Stormbringer 1st/4th Edition (page 22), the "Heavy" Body Frame colum only (for both height and weight, in English and metric Units), while the RQ3 SIZ Table is a slightly changed version of the one published in the second Cthulhu companion, Fragments of Fear (page 5). There are some significant differences between the RQ3/Fragments of Fear and the Stormbringer/BRP BGB SIZ Tables on the weight ranges for a certain SIZ.

The RQ3 Version ranges from SIZ 1 to SIZ 48, using +1 SIZ increments, the Fragments of Fear one ranges from SIZ 1 to SIZ 330, using varying SIZ increments of +4 and +8. For weight only, and while the RQ3 table uses both English and metric units, the one in Fragments of Fear does only use English units. Though on both SIZ 1 ranges from 1-12 lbs, SIZ 4 from 38-51 lbs, SIZ 8 from 109-210 lbs, and so on.

Stormbringer ("Heavy" Body Frame)/BRP BGB SIZ 1 ranges from 0-20 lbs, SIZ 4 from 31-80 lbs and SIZ 8 from 80-160 lbs, and neither the "Light" nor "Medium" Body Frame colums do exactly match the ranges given in the Fragments of Fear/RQ3 tables.

The Superworld SIZ Table differs largely from the one published in Fragments of Fear and RQ3 the higher the SIZ number is:

Superworld SIZ 16 ranges from 220-238 lbs, while on the Fragments of Fear table it would be 220-239. Just 1 lbs difference. Superworld SIZ 120 is 901 tons, while on the Fragments of Fear table it would be only 144 tons. Thats 757 tons difference. IMO the Superworld SIZ Table is a complete different approach, just as the tables in Stormbringer/BRP BGB are.

 

@JasonW The preview PDF for the Fragments of Fear product on DriveThru (http://www.drivethrurpg.com/product/1686/Fragments-of-Fear?cPath=74_79&it=1) contains the "classic" CoC SIZ Equivalency Table on its last page. That PDF can be saved to your hardrive.

A 1/5th SIZ value from the examples on page 37 of the CoC 7e rules book does more or less match the weight ranges given on that table. The easiest (and least expensive) way to get on a "Build" value would be looking up the weight range on that SIZ Equivalency Table, find the corresponding SIZ value, multiply that with 5 and look for the "Build" value for that SIZ on the table on page 33 of the CoC rules book, counting STR as 0.

So something weighing between 880 and 959 pounds would have an old SIZ of 32, multiplied by 5 you'll get a new SIZ of 160. Which would be of a "Build" of 2 on the "Damage Bonus & Build" table.

[Atgxtg]

The BRP SIZ table has some errors. The English and metric values don't match up with each other. Either because of a cut & paste error when porting over the tables, or a mental mistake- that is someone didn't know that one metric ton equals 1000 kilograms, but 1 short ton equal 2000 pounds. 

 

The SIZ table in RQ3 is from Superworld. The differences are that the Superworld SIZ table stuck with the doubling progression at the high and low ends, while RQ3 diverts. That Superworld is the source can be confirmed since it was written by Steve Perrin, who did most, if not all of the game mechanics back then.