Three steps, then just play.
Bankroll Lab turns a pile of tournament results into a bankroll plan you can actually follow — no spreadsheet surgery required.
Three steps, then just play
Add your tournaments
Import your grid or a full Excel, or add your rooms by hand. Buy-in, structure, field — Bankroll Lab handles the rest.
Calculate
One click computes ROI, variance and your bankroll shots across the whole field — with your own risk model and markup tiers.
Play your grid
Generate the optimal session under your table cap, then follow it live in Grind mode. History tracks every unlock as your roll grows.
Bankroll decisions, taken off gut feel
Most players size their bankroll with a rule of thumb — "keep 100 buy-ins" — and shot-take on feel. The problem is that variance in MTTs isn't one number: a 2,000-runner turbo swings very differently from a 180-man deepstack. Treating them the same either keeps you stuck too low or busts you moving up.
Bankroll Lab replaces the rule of thumb with your own numbers. It models expected value and standard deviation per tournament, then converts that into the exact bankroll each stake requires under the risk level you choose. The result is a plan: the games you can play today, the ones to unlock next, and the precise roll that separates them — updated every time you log results.
Poker bankroll questions
How many buy-ins do I need for MTTs?
MTTs carry far more variance than cash games, so most serious grinders keep a deep roll — commonly 100+ buy-ins for a given average buy-in, and often 200-300+ for large-field, top-heavy tournaments. Bankroll Lab computes the exact roll for each stake from your own ROI and variance instead of a rule of thumb.
What is a good ROI in MTTs?
It depends on field size and stakes, but a solid online MTT winner often runs roughly 10-30% ROI over a large sample; softer or smaller fields can be higher. Small samples are dominated by variance, so thousands of tournaments are needed before ROI stabilises. Bankroll Lab tracks your realised ROI and models its expected range.
How is poker variance calculated?
Variance is the spread of possible results around your expected value, driven mainly by field size and payout structure — top-heavy tournaments have higher variance. Bankroll Lab derives standard deviation per tournament from these inputs so you can size your roll to the swings, not just the average.
When should I take a shot at a higher buy-in?
A shot makes sense when your bankroll can absorb the extra variance without threatening your ability to keep playing your regular stakes. Bankroll Lab shows the exact bankroll each shot needs under your chosen risk model (Climb vs Stability), so you take shots deliberately.