How many females are needed?

This little tool helps you to find out your mutation chance, and how many females you might want to use when breeding for mutations in ARK.

The chance to get a specific stat mutation (and therefore the number of females needed) is affected by how many mutable stats the species has and whether one parent has more than 20 mutations. It is also hugely improved by the new trait system introduced with ASA Aberration, or if you are using the S+ Mutator.

Number of stats

ASA water species

Without movement speed and oxygen

ASA normal, and ASE flyers

Without movement speed

ASE non-flyers

Includes movement speed

ASE Gachas

Includes crafting skill

Settings

One parent is mutation capped

One parent has 20 or more mutations

Only accept males

Saves an extra step in the process

I am using the S+ Mutator

Or any mod that guarantees mutations

Traits (Ark: Survival Ascended)

+0% per-roll mutation chance +0 to stat weight +0% to select higher stat

Father

Mother

Traits should usually match your target stat, however using off-stat Mutables can sometimes be beneficial.

Breeding Pool Size

234

20%
failure rate

Average 1 in 5
rounds fail

335

10%
failure rate

Average 1 in 10
rounds fail

436

5%
failure rate

Average 1 in 20
rounds fail

569

2%
failure rate

Average 1 in 50
rounds fail

Here we show the number of females needed for different success rates, measured by the chance of failing to get a specific stat mutation (the percentage) in a single breeding round.

How good is your setup?

Use the slider to check the success rate and the fail rate for your amount of females.

Females:

100

Success rate:

49.7565% (1 in 2 rounds)

Failure rate:

50.2% (1 in 2 rounds)

Base setting overrides

Click to show

If you are using a mod that alters the base values you may change them here.

Mutation rolls % Mutation roll chance % Chance to pick higher stat %

Numbers for nerds

Click to show

Here we'll show all of the steps we use to calculate these results.

Notable Changes

October 28th, 2024

Add overrides for base mutation rolls, mutation roll chance, and chance to pick higher stat.
Allow more than three off-stat Mutables traits.

September 5th, 2024

Added support for Traits from Bob's Tall Tales, massively improving your mutation chances.

October 7th, 2024

Added ability to use off-stat Mutable traits, which can be a little better than Robust before you have enough good target stat Mutables.