Steal an Egg: Pet Rarity & Income Per Second

This calculator works out how much income per second you gain from stealing an egg in a pet-raising game, based on the pet’s rarity and your current income rate. You enter the egg’s rarity tier and your current income per second, and it returns the new income per second after the egg hatches and is added to your collection. It also shows the exact increase so you can see whether the steal is worth the risk.

Formula

The calculator uses a simple linear formula:

New income per second = Current income per second + (Rarity tier × 10)

Where:

• Current income per second – your base income rate in coins per second (what you earn before the egg bonus).
• Rarity tier – a number from 1 to 5 representing the egg’s rarity (1 = Common, 2 = Uncommon, 3 = Rare, 4 = Epic, 5 = Legendary).
• New income per second – your total income rate after the egg’s bonus is applied.

The multiplier (10 coins per second per tier) is a typical value used in many idle and pet-collecting games. If your game uses a different multiplier, you can adjust the formula by changing the number 10 in the expression.

Worked Example

Using the default values from the calculator:

• Rarity tier = 3 (Rare egg)
• Current income per second = 100 coins/s

Step 1: Multiply the rarity tier by 10: 3 × 10 = 30 coins/s.

Step 2: Add that to your current income: 100 + 30 = 130 coins/s.

So the new income per second is 130 coins/s, an increase of 30 coins/s.

How Pet Rarity Affects Income

In most pet-collecting games, rarity determines the base stats of the pet, including how much income it generates per second. Common pets give a small flat bonus, while Legendary pets give a much larger one. The exact numbers vary by game, but the pattern is consistent: higher rarity = higher income contribution.

Some games also apply a percentage bonus instead of a flat amount. For example, a Rare pet might increase your total income by 5%, while a Legendary might give 20%. This calculator assumes a flat bonus per tier, which is easier to reason about and common in early-game mechanics. If your game uses percentages, you would need to multiply your current income by the percentage instead.

When to Steal an Egg

Stealing an egg usually carries a risk – you might fail, lose resources, or trigger a cooldown. Before you steal, consider:

• Your current income – if you already earn a lot, a small flat bonus may not matter much.
• The egg’s rarity – higher rarity eggs are worth more risk.
• The cost of failure – some games penalize you with a loss of coins or a temporary ban from stealing.
• Your long-term goals – if you are saving for a big purchase, a small income boost might not be worth the risk.

Use the calculator to see the actual increase. If the increase is less than 1% of your current income, it might be better to skip the steal and save your resources.

Common Mistakes and Misconceptions

One common mistake is confusing rarity tier with star level or evolution stage. Rarity is usually fixed at hatch, while stars or levels are upgraded later. This calculator only handles the base rarity bonus.

Another misconception is that a Legendary egg always gives a huge boost. In some games, the bonus is capped or scales with your level, so a Legendary egg at low level might give less than a Common egg at high level. Always check the actual formula in your game.

Also, be careful with units. Some games show income per minute or per hour, not per second. If your game uses per minute, divide by 60 to get per second before using the calculator.

Limits of This Calculation

This calculator assumes a flat, linear bonus. Real games often have more complex formulas involving pet level, synergy bonuses, or multipliers from other pets. The result here is a rough estimate, not a precise prediction.

If your game uses a percentage bonus, you can still use the calculator by converting: for a 5% bonus, multiply your current income by 0.05 and add that as the increase. For example, if your income is 100 coins/s, a 5% bonus gives 5 coins/s, so the new income is 105 coins/s.

For games with exponential growth or diminishing returns, this linear model will not be accurate. In those cases, you need the game’s specific formula.

Frequently Asked Questions

What is the best rarity to steal?

Legendary (tier 5) gives the largest flat bonus, so if you can steal it without too much risk, it is usually the best. However, if the failure rate is high, a Rare (tier 3) might be more reliable. Use the calculator to compare the increase per risk.

Does the egg’s level matter?

In many games, the egg’s level or star rating affects the bonus. This calculator assumes the bonus is based purely on rarity. If your game has levels, you may need to multiply the bonus by a level factor.

How do I convert income per minute to per second?

Divide by 60. For example, 300 coins per minute is 5 coins per second (300 ÷ 60 = 5). Always use per second in the calculator to get the correct result.

What if the game uses a percentage bonus?

Change the formula. Instead of adding a flat amount, multiply your current income by the percentage. For a 10% bonus, the new income is income × 1.10. You can still use the calculator by entering your income and then manually calculating the increase.

Is stealing always worth it?

Not always. If the increase is tiny compared to your current income, or if the risk of failure is high, it might be better to skip. Use the calculator to see the increase, then weigh it against the potential loss.

Can I use this for any pet game?

Yes, as long as the game uses a flat bonus per rarity tier. If the bonus structure is different, you’ll need to adjust the formula. The calculator is a general tool, not tied to a specific game.

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in rarity | Rarity tier | - | 3 | 1 | 5
in income | Current income per second | coins/s | 100 | 0 | 1000000
out new_income | New income per second | coins/s | income + (rarity * 10) | 2
out increase | Increase | coins/s | rarity * 10 | 2