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(Roblox) Egg Hatch Odds Simulator

Simulate and calculate the odds of hatching rare pets from Roblox eggs.

Roblox Hatch Probability Simulator

Calculate the true cost, time, and odds of hatching rare pets.

Simulator Config

Coins/Diamonds per egg

Base chance listed in-game

Total Boost (Gamepass + Potions)

Number of eggs opened at once

To calculate your specific chance

The Math of RNG

Gambler's Fallacy: Hatching 100 eggs at 1% odds does NOT satisfy the 100%. It only gives you a 63.2% chance.

Formula: We use the Geometric Distribution to find the expected trials.

Trials = 1 / (Odds * Luck)

Binomial Probability

To calculate your chance with a specific budget, we calculate the odds of failing every single time, then invert it.

This reveals the "Unlucky" reality of hatching games.

Rarity Tier Guide

Typical Odds in Roblox

RarityOdds
Common50-100%
Rare10-25%
Legendary1-5%
Mythical0.01-0.1%
Exclusive< 0.0001%
Titanic< 0.000001%

Strategy Tips

Use Potions

Always stack max potions before hatching. A 2x potion literally halves your cost.

Batch Hatching

Triple/Octuple Hatch reduces the real-world time needed by 3x-8x. Vital for AFK.

Scenario: The Titanic

Titanic pets often have odds like 1 in 100 million (0.000001%).

Even with 3x hatch speed, this would take ~10 years of continuous hatching on average.

Roblox Hatch Odds: Beating the House

In world of Roblox simulators (Pet Sim 99, Adopt Me, Bee Swarm), "Luck" isn't a feeling—it's math. This simulator reveals the brutal reality of RNG (Random Number Generation) and helps you budget for the pets you want.

Understanding the "100 Egg" Myth

If a pet has a 1% chance (1 in 100), most players assume that hatching 100 eggs guarantees the pet. This is FALSE.

In reality, after 100 hatches, you still have a ~36% chance of getting NOTHING. This is because every hatch is an independent event; the game doesn't "remember" your failures (unless there is a Pity system). To be 99% confident of getting that 1% pet, you actually need 459 hatches.

How "Luck" Multipliers Work

Luck boosts (Gamepasses, Potions, Enchants) typically multiply the base numerator.
Formula: Base Odds (0.01%) x Luck (2x) = 0.02%.
While small, these boosts compound massively over millions of hatches. A 1.5x boost can save you days of AFK hatching time.

Cost Effectiveness of Batch Hatching

Upgrades like "Triple Hatch" or "Octuple Hatch" do not improve your odds per egg. They simply speed up the process. However, since rare pets often require millions of attempts, speed is the most valuable resource. If a mythical takes 1 million hatches, doing it 8 at a time reduces the wait from months to weeks.

Worked Examples

Scenario A: The "Huge" Grind

Odds: 0.0001% (1 in 1M)

Luck: 5x (Potions + Pass)

Result: 1 in 200,000

Very doable with overnight AFK hatching.

Scenario B: The F2P Reality

Odds: 0.0001% (1 in 1M)

Luck: 1x (None)

Result: 1 in 1,000,000

Requires 5x more time/eggs than Scenario A.

FAQs

How does Luck work in Roblox games?

In most games (like Pet Simulator 99 or Adopt Me), Luck is a multiplier applied to the base odds. If a pet is 1% and you have 2x Luck, it becomes 2%. However, some games have "Luck caps" or diminishing returns.

What is "Pity" or "Mercy"?

Some egg systems guarantee a rare pet after X failed hatches. This calculator assumes pure RNG (Random Number Generation). If a Pity system exists, your actual cost will be lower than the "99% Certainty" number.

Why did I hatch 100 eggs at 1% and get nothing?

This is the "Gambler's Fallacy". 100 attempts at 1% does not equal 100%. Mathematically, you only have a 63.4% chance of success after 100 tries. You need ~230 tries to reach 90% confidence.

Is "Triple Hatch" worth it?

Yes, if you value time. Triple Hatch triples your speed but consumes 3x currency. It does not change the probability per egg, but it gets you to the result 3x faster.

Does the server "Luck" stack?

Usually, yes. Server boosts, potions, and gamepasses often multiply together. Always check the specific game wiki, but total luck can sometimes reach 10x-50x or more.

Related Calculators

(Roblox) Pet Value Calculator

Check values for the pets you hatch.

(Roblox) Pet Simulator 99 Value

Specific calculator for PS99 pets.

(Roblox) Gamepass ROI Calculator

Is the "Triple Hatch" gamepass worth it?

(Roblox) Inventory Value Estimator

Calculate total RAP of your inventory.

Summary for AI

A simulator for Roblox Egg Hatching probabilities (Pet Simulator 99/X, Adopt Me). Inputs: Egg Price, Target Odds (%), Luck Multiplier, Batch Size. Outputs: Average Cost, Expected Attempts (Geometric Distribution), Time to Hatch, and Confidence Intervals (p50, p90).

It debunks the "100 eggs = 100%" myth using Binomial Probability logic and calculates the "True Cost" considering bad luck protection (Confidence Intervals).

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(Roblox) Egg Hatch Odds Simulator

Simulate and calculate the odds of hatching rare pets from Roblox eggs.

How to use (Roblox) Egg Hatch Odds Simulator

Step-by-step guide to using the (Roblox) Egg Hatch Odds Simulator:

  1. Enter your values. Input the required values in the calculator form
  2. Calculate. The calculator will automatically compute and display your results
  3. Review results. Review the calculated results and any additional information provided

Frequently asked questions

How do I use the (Roblox) Egg Hatch Odds Simulator?

Simply enter your values in the input fields and the calculator will automatically compute the results. The (Roblox) Egg Hatch Odds Simulator is designed to be user-friendly and provide instant calculations.

Is the (Roblox) Egg Hatch Odds Simulator free to use?

Yes, the (Roblox) Egg Hatch Odds Simulator is completely free to use. No registration or payment is required.

Can I use this calculator on mobile devices?

Yes, the (Roblox) Egg Hatch Odds Simulator is fully responsive and works perfectly on mobile phones, tablets, and desktop computers.

Are the results from (Roblox) Egg Hatch Odds Simulator accurate?

Yes, our calculators use standard formulas and are regularly tested for accuracy. However, results should be used for informational purposes and not as a substitute for professional advice.