Sigma Girl

Sigma Girl is a Legendary brainrot in the Roblox game Steal a Brainrot. It costs 340K and earns 1.8K per second, which works out to 108K per minute, 6.48M per hour and 156M over a full day of earning time. At its base rate, Sigma Girl pays back its own price in about 3 minutes. Among the 21 Legendary brainrots in our database it ranks number 2 for income, and number 196 of 257 across every rarity, which puts it ahead of about 24 percent of all brainrots we track.

This page covers everything you need to decide whether Sigma Girl belongs in your base: its full stats, how much it earns over time and with multipliers, how fast it pays for itself compared with other Legendary brainrots, cheaper or stronger alternatives, how to get it, and how to keep it from being stolen. All numbers are base values before rebirth bonuses, mutations or traits.

Sigma Girl stats

How much does Sigma Girl make?

The table shows how much cash Sigma Girl generates over common play sessions at its base rate. Steal a Brainrot pays income every second while the brainrot sits on a pad in your base, so longer sessions add up quickly, especially for higher rarities.

In one hour, Sigma Girl earns about 19.1 times its own price. That is a very fast return, so buying it early in a session is almost always worth it.

How brainrot income works

Each brainrot standing on a pad in your base adds its income to a collector that fills every second. Walk over or press the collect button to move that cash into your wallet, then spend it on more brainrots, upgrades or rebirths. Income only builds while the brainrot is in your base, so a stolen brainrot stops earning for you immediately and starts earning for the thief. That is why defence matters as much as buying: protecting Sigma Girl keeps its 1.8K per second flowing.

Sigma Girl income with multipliers

Base income is only the starting point. Rebirths, mutations, traits and limited events can multiply what a brainrot earns, and the effects stack in game. Use this table to estimate Sigma Girl with common multipliers, then check exact bonuses in your own game, because multiplier values change with updates.

For your own numbers, open the Steal a Brainrot income calculator and enter Sigma Girl with your multiplier.

Is Sigma Girl worth it?

Compared with the rest of its rarity, Sigma Girl pays back faster than the typical Legendary brainrot, which makes it a good value pick. The median Legendary brainrot costs 255K, earns 1.05K per second and pays back in about 4 minutes. Sigma Girl costs more than that median and earns more.

Value is not the only thing that matters. Your base has a limited number of pads, so in the long run the brainrots with the highest income per second win, even if they took longer to pay back. A good rule is to buy fast-payback brainrots early to build cash, then replace them with the highest earners you can afford, and sell or swap the weakest pad whenever you upgrade.

Sigma Girl vs similar Legendary brainrots

These are the Legendary brainrots ranked closest to Sigma Girl by income, so you can see what a little more or a little less money gets you.

Cheaper or stronger alternatives to Sigma Girl

No brainrot in our database costs the same or less than Sigma Girl while earning more per second, so at its price point it is the strongest earner you can buy.

When you are ready to upgrade, these are the cheapest brainrots that earn more than Sigma Girl:

• Buho de Fuego (Legendary): 345K for 2.3K per second, 1.3 times the income.
• Rhino Toasterino (Mythic): 450K for 2.1K per second, 1.2 times the income.
• Bombardiro Crocodilo (Mythic): 500K for 2.5K per second, 1.4 times the income.
• Bruto Gialutto (Mythic): 600K for 3K per second, 1.7 times the income.
• Spioniro Golubiro (Mythic): 750K for 3.5K per second, 1.9 times the income.

Where Sigma Girl fits in your progression

Sigma Girl is an early to mid-game brainrot. Most players can afford it after a short session of collecting from cheaper brainrots, and it is a common choice while working toward the first rebirths. It earns enough to speed up saving for higher-rarity brainrots, but it is not something to keep forever: once your income per second passes a few thousand, replace the weakest brainrots like this one with higher-rarity earners. Keep an eye on the conveyor so you do not miss better-value options at a similar price.

Rebirths reset your cash and brainrots in exchange for permanent bonuses, and some rebirths require you to own specific brainrots. Before you rebirth, check whether Sigma Girl is needed for your next one, and plan purchases so the brainrots you buy now also help you meet the next requirement.

How to get Sigma Girl

Sigma Girl appears on the red conveyor belt in the middle of the map. When it rolls past, walk up to it and buy it for 340K before another player does; it then walks to an empty pad in your base. You can also steal Sigma Girl from another player whose base is unlocked, carrying it back to your own base without getting hit.

About the Legendary rarity

Legendary brainrots cost from tens of thousands to a few hundred thousand and are a big jump in income. They spawn less often, so other players will compete for them on the conveyor. A base full of Legendaries is a strong mid-game setup and a common requirement around early rebirths. From this rarity up, thieves start paying attention, so use your lock.

Rarity order from lowest to highest: Common, Rare, Epic, Legendary, Mythic, Brainrot God, Secret and OG. See the rarities explained guide for the full breakdown.

How to protect Sigma Girl from thieves

Every brainrot in your base can be stolen, and higher-value ones attract the most attention. Lock your base whenever you leave it: the lock is active for 30 seconds when you join, and after that you can lock it for 60 seconds plus 10 seconds for each rebirth. Stay near your base when the lock is about to run out, and keep your most valuable brainrots on the pads farthest from the entrance so thieves need more time to grab them.

If someone does steal Sigma Girl, chase them. A player carrying a stolen brainrot moves more slowly, cannot use items and triggers an alert, and a single hit sends the brainrot straight back to your base. Using speed upgrades and staying in servers with fewer players also helps. For more defence tips, read the Steal a Brainrot hub.

Sigma Girl FAQ

How much does Sigma Girl cost in Steal a Brainrot?

Sigma Girl costs 340K in in-game cash.

How much money does Sigma Girl make?

It earns 1.8K per second at base rate, or 6.48M per hour.

What rarity is Sigma Girl?

Sigma Girl is a Legendary brainrot, ranked 2 of 21 in that rarity by income.

How long does Sigma Girl take to pay for itself?

About 3 minutes at base income, and less with multipliers.

Is Sigma Girl good?

It pays back faster than the typical Legendary brainrot, which makes it a good value pick.

Can Sigma Girl be stolen?

Yes. Any brainrot in an unlocked base can be stolen, but hitting the thief once sends it back to your base.

Where does Sigma Girl rank overall?

It ranks 196 of 257 brainrots in our database by income per second.

Stats come from a community-maintained list, checked 2026-10-21. Values can change after game updates; verify in game before large trades.