If you manage an ARK: Survival Ascended server with boosted rates, you already know the frustration: you open Dododex, punch in your creature, and get a maturation time that's completely wrong for your server. Not because Dododex is broken — it isn't — but because it has no idea what BabyMatureSpeedMultiplier you're running. Dododex is a vanilla reference. It is excellent for vanilla. The moment your server diverges from default settings, those numbers become fiction.
This is a problem every server admin encounters. Players ask "how long will this Rex take to mature?" You pull up your config, do mental math, get it wrong anyway, and tell them to just wait and see. There's a better way.
In this guide, we'll break down exactly which multipliers control breeding times in ASA, show you the real math, walk through a concrete example, and explain how to stop guessing and start getting your server's actual numbers.
ARK: Survival Ascended has five breeding-specific server multipliers — settings that shift every maturation time, every imprint window, and every mating cooldown on your server. The default value for all of them is 1.0, which means "vanilla speed."
Most private servers don't run vanilla rates. A typical boosted community server might run BabyMatureSpeedMultiplier at 3× or 5×, with a matching adjustment to imprint intervals. Some modded servers crank it to 20× or higher so players can breed during a single gaming session.
The problem is structural: every public ARK calculator — Dododex, the official wiki, online fan sites — is built with the assumption that your server runs at exactly 1.0 on all these multipliers. None of them ask for your server settings. None of them know what GameUserSettings.ini says on your machine. So the numbers they produce are accurate for vanilla ARK and useless for your boosted server.
To be direct and fair about this: Dododex is one of the best vanilla ARK reference tools ever built. Its creature database, taming food lists, and maturation timers are carefully maintained and accurate for default server settings. The ARK wiki carries authoritative base stats. If you are playing on an official server or a server with default rates, these tools are excellent. Use them.
The limitation isn't a flaw in Dododex — it's a category mismatch. Dododex is answering "how long does a Rex take to mature in standard ARK?" You're asking "how long does a Rex take to mature on my server, at my rates?" Those are different questions, and no public vanilla reference tool can answer the second one without knowing your config.
These five settings in your ARK server config are the ones that directly affect breeding calculations. They all live in GameUserSettings.ini under the [ServerSettings] section, except where noted.
This is the big one. It controls how fast babies grow from newborn to adult. Higher = faster maturation. The formula is simple:
A Rex has a base maturation time of roughly 99.97 hours (about 4.2 days) at vanilla speed. At 3×, that becomes 33.3 hours. At 10×, about 10 hours. Importantly, a higher BabyMatureSpeedMultiplier also compresses the imprint window — you have less total time to collect impresses, so you need to adjust BabyCuddleIntervalMultiplier in tandem (more on that below).
Controls how fast fertilized eggs incubate. Only applies to egg-laying creatures — it does not affect live-birth creatures like Raptors or Rex (those use BabyMatureSpeedMultiplier for the entire gestation + growth cycle).
A Wyvern egg, for example, takes roughly 5 hours to hatch at vanilla speed. At 5×, that's 1 hour.
Controls how frequently imprint opportunities appear. Default 1.0 means imprint windows appear every 8 hours (creature-dependent). A lower value means more frequent imprints; a higher value means fewer. The formula:
This multiplier interacts critically with BabyMatureSpeedMultiplier. If you boost maturation speed without also boosting the imprint interval, the baby will finish growing before you can collect enough imprint interactions to reach 100%. For example: a Rex matures in 33.3 hours at 3× BabyMatureSpeed. If imprint windows still appear every 8 hours, you only get 4 windows — nowhere near enough for 100% imprint at vanilla cuddle quality.
Controls the cooldown between when two creatures can mate again. Note the direction: a lower value shortens the cooldown (unlike the others, where higher = faster). The formula:
At vanilla, mating cooldowns range from a few hours to over a day depending on the creature. Most boosted servers set this between 0.01 and 0.1 to make mating nearly instant.
Scales the quality (percentage gained) of each imprint interaction. At vanilla 1.0, each successful imprint gives a creature-specific bonus (typically 10–20% per cuddle, depending on the species). Raising this lets you reach 100% imprint even when maturation is fast and cuddle windows are limited.
Let's work through the full Rex breeding calculation at 3× maturation so you can see concretely what changes. These figures use ASA base stats sourced from the ARK wiki.
| Setting | Vanilla (1×) | 3× Boosted | What Changed |
|---|---|---|---|
| BabyMatureSpeedMultiplier | 1.0 | 3.0 | |
| Rex maturation time | ~100 hours (4.2 days) | ~33 hours (1.4 days) | 3× faster |
| BabyCuddleIntervalMultiplier | 1.0 | 3.0 | Matched to mature speed |
| Imprint window every | 8 hrs | 2.67 hrs | 3× more frequent |
| Imprint windows in maturation | ~12 | ~12 | Same count when matched |
| 100% imprint achievable? | Yes | Yes (if BabyCuddleInterval also boosted) | |
| BabyMatureSpeedMultiplier NOT matched to cuddle | — | 3.0 mature / 1.0 cuddle | |
| Imprint windows in maturation | — | ~4 | Only 4 chances |
| 100% imprint achievable? | — | No (unless BabyImprintAmount raised) | Common admin mistake |
The table makes the key interaction visible: when you boost maturation speed, you must either boost the cuddle interval multiplier in proportion (so you get the same number of imprint windows per maturation cycle) or raise BabyImprintAmountMultiplier so each cuddle gives more quality — or both. If you only boost BabyMatureSpeedMultiplier and leave everything else at 1.0, your players will consistently fail to reach 100% imprint, which is a support headache you can avoid entirely.
If you want to do this manually, here's the full calculation chain:
actual_mature_seconds = base_mature_seconds / BabyMatureSpeedMultiplieractual_cuddle_seconds = base_cuddle_seconds / BabyCuddleIntervalMultiplier. If you don't know the base cuddle interval, it's typically creature-dependent (roughly 14,400 seconds for large creatures like Rex at vanilla).imprint_windows = floor(actual_mature_seconds / actual_cuddle_seconds)base_imprint_per_cuddle × BabyImprintAmountMultiplier. Multiply by imprint windows; if the total reaches 100%, you're set.This works, and if you're comfortable in spreadsheets it's manageable. It becomes tedious when you want to compare different multiplier combinations or check multiple creatures. And it requires finding accurate base values for each creature, which takes time.
NodeMesh's ARK Breeding Calculator is built specifically for this problem. It reads your server's live multiplier settings directly from your server config, then shows you maturation times, imprint windows, and 100% imprint feasibility for any creature — all calculated against your actual numbers, not vanilla defaults.
Each result is labeled by the config key driving it. So instead of a bare "33.3 hours," you see "33.3 hours — driven by BabyMatureSpeedMultiplier 3.0." This makes the calculation auditable and helps you tune your settings confidently.
The public version of the calculator (no login required) defaults to vanilla multipliers (all at 1.0) so you can use it as a vanilla reference too. Once you connect your ARK server to NodeMesh, the calculator automatically reads your actual live config and pre-populates the multiplier fields.
Enter your server's multipliers and get exact maturation times, imprint windows, and 100% imprint feasibility for any creature. No spreadsheet. No guessing.
Open the ARK Breeding CalculatorYou might also want to check the ARK Taming Calculator (for the same server-aware approach to taming speed and food calculations) and the ARK Stats Calculator for creature stat analysis.
For a deep dive into every breeding multiplier — with formulas, tables across popular creatures, and the full explanation of how imprint math works — read the companion guide: How ARK's Breeding Multipliers Actually Work.