Steal a Brainrot Value Calculator
Total up your income per second, see what each mutation is worth, and check whether a trade is fair — all in your browser, with numbers you set yourself.
Add each brainrot with its income per second, its mutation, and how many you own.
Everything runs in your browser from the numbers you enter — no login, nothing uploaded, nothing kept after you close the tab. A fan-made helper, not official game data.
This is a three-in-one companion calculator for the Roblox game Steal a Brainrot, where the characters you collect sit in your base earning cash every second — and rival players try to snatch your best earners. Use the Income tab to add up how much your line-up makes per second, minute, hour, and day; the Mutation tab to see what a Gold, Diamond, or Rainbow version is really worth; and the Trade tab to check whether a swap is fair before you agree to it. Everything runs on your device from numbers you type in, so there is no login, nothing is uploaded, and no value list buried in the page can quietly go out of date.
Add up what your brainrots really earn
The whole point of the game is passive income, but a base full of brainrots makes your true rate hard to eyeball. Add each one with its base income per second, pick its mutation, and set how many you own; the tool multiplies it out and shows your total per second, then projects that to a minute, an hour, and a full day. There is also a goal box: type the amount you are saving toward — a pricey brainrot, an upgrade — and it estimates how long your current rate will take to get there. Because earnings in this game climb into the millions and billions, the projections are shown in shortened form (K, M, B, T) so the numbers stay readable instead of running off the screen.
See what a mutation is actually worth
Mutations such as Gold, Diamond, and Rainbow multiply the income a brainrot produces, which is why a mutated copy can be worth several times the plain one. Enter a base income and choose a mutation to see the multiplier applied and the new per-second figure. Every multiplier here is editable, and the values you set are the same ones the Income tab uses — so when an update rebalances a mutation or a new variant appears, you change the number once and both tabs follow. You can add your own entries to the list as well, which is handy for limited or event mutations that come and go.
Check a trade is fair before you accept
Line up what you are giving on one side and what you are receiving on the other, each with a value and a quantity. The calculator totals both columns, shows the gap between them, and gives a plain verdict — fair, you win, or you lose — along with how far apart the sides are as a percentage. Many players price a brainrot by its income per second, so you can drop those figures straight in; if your trading group keeps its own value list, use those numbers instead. Set the “fair range” to the imbalance you are willing to accept, and the verdict updates as you type.
Why the numbers are yours to set
Brainrot income, mutation multipliers, and what any character is “worth” in a trade all shift as Steal a Brainrot is updated, and the game publishes no official value feed. Rather than hard-code a list that would be wrong within a week — or pull “live” numbers from a source that might be stale or gone — this tool does the maths and lets you supply the numbers. That keeps it honest and permanently current: the formulas never rot, and you plug in whatever your version of the game actually shows. Nothing you enter leaves your device, and closing the tab clears it. This is a fan-made helper for sanity-checking your own figures, not official game data.
Frequently Asked Questions
Does this show live in-game values, prices, or stock?
No. Steal a Brainrot has no official value or price feed, so instead of showing numbers that would quickly be wrong, the tool does the calculations and you enter the current figures. That way nothing it shows can go stale between game updates.
How does the income projection work?
For each brainrot you add its base income per second, its mutation, and how many you own. The tool multiplies base by the mutation multiplier by quantity, adds up every row for a total per second — then scales that to a minute, an hour, and a day. The goal box divides your target amount by that rate to estimate how long it will take to reach.
What do the Gold, Diamond, and Rainbow mutation multipliers do?
A mutation multiplies a brainrot’s income, so a Diamond or Rainbow copy earns several times what the plain version does. The exact multipliers change with updates, so they are editable — set them to match your game and the Income tab uses the same values.
How is a trade judged fair, win, or lose?
It adds up the value of every item on each side (value times quantity), compares the two totals, and shows the difference as a percentage. If the gap is inside the fair range you choose it reads “fair”; otherwise it tells you which side comes out ahead and by how much.
Is this tool official or affiliated with the game?
No. It is an independent, fan-made calculator with no connection to the game or its developers. Treat every result as an estimate to help you make your own decision, not as official data.
Do I need an account, and is anything uploaded?
Neither. The whole calculator runs in your browser, there is no sign-up, and nothing you enter is sent to a server or saved after you leave the page. It is a private scratchpad for income, mutations, and trades.