How to Size Your Poker Bankroll and Choose Stakes

Poker bankroll management starts with money you can afford to lose without affecting everyday life, followed by stakes at which that money covers your chosen number of full buy-ins. You also need written rules for moving down, spending limits and a record of results. For cash games, you can calculate a model-based risk of ruin; for multi-table tournaments (MTTs), the presets used here are buy-in guidelines, not safety probabilities.

This guide is for adults playing poker against other people. Neither a bankroll nor a calculator creates an edge. If you have no reliable basis for assuming a positive win rate, set an affordable learning or entertainment budget and choose low stakes rather than treating hoped-for profitability as a measured fact.

What Counts as a Bankroll, and How Much Should You Set Aside?

Your bankroll is the money available for poker, separate from living expenses, emergency savings and tax reserves. Decide how much you can afford to lose first, then choose a format and stake that fit that amount.

Do not start by asking how much you need to deposit to play higher. Start with a personal spending limit. If your available funds do not support the stake you want, choose a cheaper game or do not play; borrowing is not the solution.

Replenishing a bankroll is a separate budget decision, not a way to chase losses. A deposit is not profit. For a losing player, a larger bankroll may delay running out of money, but it does not make the game profitable.

Beginners should separate two questions:

• How much am I willing to spend on learning or entertainment? This is a personal budget limit.
• What reserve does the calculation suggest for an assumed edge? This is a conditional model result that applies only under its assumptions.

The general bankroll management guide explains how to separate playing funds from household money. Here, the focus is poker-specific units, calculations and practical decisions.

Why Is There No Single Buy-In Rule for Every Format?

A rule such as “20, 50 or 100 buy-ins” cannot suit every format because the range of possible results and the structure of costs differ. The same number of buy-ins does not necessarily mean the same risk.

PokerStars Learn gives educational examples of 20–30 buy-ins for cash games and 50–100 for tournaments. These are operator-provided learning guidelines, not universal safety thresholds or an assessment of your edge.

Large fields, fast structures and uneven payouts need separate planning. Do not automatically transfer an SD estimate from one cash variant to another or treat a deep stack as a standard 100-big-blind buy-in.

For live poker, keep travel and accommodation costs outside your playing bankroll; PokerStars Learn also highlights these expenses. Fewer hands per hour do not, by themselves, reduce the reserve required by a fixed-stakes, unlimited-horizon model. They change the pace of play in calendar time, not the eventual probability of reaching zero. There is no basis here for a universal live-poker discount on bankroll requirements.

How Do You Convert Cash Stakes into Money and Buy-Ins?

In the calculations below, one full cash buy-in equals 100 big blinds. NL10 with blinds of $0.05/$0.10 therefore has a $10 buy-in, while NL25 has a $25 buy-in.

In formulas, bb means big blinds. This table shows arithmetic only: the full buy-in multiplied by 30 or 50. It does not label either reserve as safe.

The formulas are:

number of buy-ins = bankroll / buy-in cost

reserve = number of buy-ins × buy-in cost

If you sit down with a smaller or larger stack, do not silently substitute it for the 100-big-blind unit. Keep units consistent throughout the calculation and separately account for the actual stack and its appropriate SD.

Choosing a cheaper table still requires attention to opponent strength and rake. Lower stakes reduce the monetary cost of a buy-in, but do not prove a positive win rate.

How Is Cash-Game Risk of Ruin Calculated?

Risk of ruin (RoR) here is the probability of first reaching a zero bankroll in a fixed-stakes, unlimited-horizon model. It is not the probability of ending a particular session down, a drawdown from your peak, or a guarantee of surviving a specified number of hands.

For a positive win rate, the formula is:

RoR = exp(-2 × w × B / s²)

The inverse formula for the required bankroll is:

B = -s² × ln(r) / (2 × w)

The variables are:

• w: expected net win rate in big blinds per 100 hands, not the percentage of hands won;
• s: standard deviation (SD) of a 100-hand result, in big blinds;
• B: the entire bankroll in big blinds;
• r: the selected risk as a decimal—for 2.5%, use 0.025, not 2.5.

SD and variance are different quantities: variance equals s². Under independent increments, an SD of 90 big blinds per 100-hand block corresponds to 9 big blinds per hand, not 0.9.

The basis is the continuous Brownian boundary-hitting model described by Karl Sigman, 2006, §1.8. The formula is exact for that model and an approximation for discrete poker results. The source describes the mathematics, not measured player performance.

What Assumptions Limit the Calculation?

The calculation assumes a constant win rate and SD, fixed stakes, independent increments in results, and no deposits or withdrawals. It does not account for changes in your play, opponents or table conditions.

Use a win rate after rake. If rakeback is already included in the expected net result, do not add it again.

A recently measured win rate remains an uncertain estimate, with uncertainty affected by sample size. An all-in-adjusted results line does not prove a true edge. All positive win rates used below are therefore example assumptions, not claims about your ability.

With a nonpositive w, this unlimited-horizon model gives a probability of eventually reaching zero of 1. A finite reserve does not guarantee that you can keep playing forever. This is not a prediction of an immediate loss or a claim about when funds will run out.

How Does the Number of Buy-Ins Affect Model Risk?

With the assumed values w = 5 and s = 90, a larger bankroll reduces calculated RoR. Each buy-in in this example contains exactly 100 big blinds.

The displayed 0.01% is not zero. Both the table and chart show conditional model results, not a personal forecast.

How Many Buy-Ins Are Needed for a Target Risk?

For a strict requirement that risk must not exceed the target, round the fractional buy-in requirement upward. The interface rounds to the nearest whole number, which does not always produce the same result.

For example, the interface may round 37.302 to 37, but a strict “no more than 1%” target requires 38 full buy-ins under these assumptions.

The calculation is highly sensitive to its inputs: halving a positive win rate doubles the required reserve, while doubling SD increases it fourfold. See the bankroll risk of ruin guide for more on the limits of this approach.

How Do You Reproduce the Cash Calculation in the Calculator?

Open the bankroll calculator, select Cash, and enter the values below. These are hypothetical inputs; presets and examples do not replace data about your own game.

1. Enter 5 in Win rate.
2. Enter 90 in Std. deviation.
3. Enter 500 in Current bankroll.
4. Enter 10 in Cash buy-in (100bb). The bb in this control label means big blinds.
5. Select Standard, with a target risk of 2.5%.

Cash calculator inputs: win rate 5, SD 90, current bankroll 500, and cash buy-in 10

Inputs for the hypothetical example. The calculator screenshots in this guide were captured in the separate English localhost interface; they do not verify the live website.

The result shows 50 current buy-ins, 30 required buy-ins after rounding, and a required bankroll of $300. The interface displays current RoR as 0.2%; before rounding it is 0.2089%, or approximately 0.21%.

Cash calculator result showing 50 current buy-ins, 30 required buy-ins, and 0.2% risk of ruin

At a $10 buy-in, a $500 bankroll contains 50 full buy-ins. In this example, 30 also matches upward rounding for the 2.5% target.

With the same bankroll and assumed parameters, changing the buy-in to $25 gives 20 buy-ins and an RoR of 8.47%. A $500 balance alone does not justify moving to NL25. Comparing stakes shows the effect of buy-in cost, not your skill at the new stake.

How Do You Count Tournament Entries and Average Buy-In?

For tournaments, count the full paid entry cost, including fees. A re-entry is another full buy-in, not a free continuation of the first entry.

For example, an entry of $5 plus a $0.50 fee costs $5.50. Calculate average buy-in as:

average buy-in = total full paid entry costs / number of entries

The average buy-in for this set is 40.70 / 10 = 4.07, or $4.07.

An average does not make every expensive tournament affordable. Set both a maximum cost per entry and a total session spending limit.

For a $5.50 tournament with two permitted re-entries, the maximum cost of three entries is $16.50 before any additional expenses. Decide the permitted number of entries in advance. If the structure allows additional chip purchases, budget for those too rather than treating them as covered by the regular entry.

Which Tournament Guidelines Does the Tool Use?

The tool uses its own buy-in-count guidelines, determined by format and profile. These are design heuristics, not universally accepted safety recommendations or calibrated probabilities of ruin.

The profile name describes the selected reserve guideline, not your playing style. Large fields, very fast structures, tournaments with additional chip purchases, or an unknown ROI may call for caution beyond these guidelines.

In this tournament context, ROI is net tournament profit divided by the full cost of paid entries. It is not cash-game win rate. One tournament win does not establish a positive expected ROI.

How Do You Reproduce the MTT Calculation?

Select MTT, enter a current bankroll of 500 and a full buy-in of 5, then select Standard. The tool shows 100 current buy-ins, 100 required buy-ins, and a $500 bankroll guideline.

The 5 here means the complete entry cost. If the actual entry is $5 plus $0.50, use $5.50 for that tournament rather than copying the example value.

MTT calculator result showing 100 current buy-ins, 100 required buy-ins, and a dash for risk of ruin

The Standard MTT guideline is 100 full buy-ins. The dash means that tournament RoR is not calculated.

This tab has no ROI field and no calibrated tournament RoR calculation. You cannot conclude that 100 buy-ins correspond to a 1% risk—or any other specific probability.

How Should You Plan to Move Up or Down in Stakes?

Before moving up, write down the entry condition, maximum loss for a short shot, and bankroll threshold for returning to your previous stake. This plan limits spending; it neither proves an edge nor represents a calculated optimal strategy.

Here is a conditional discipline example using the same assumed w = 5 and s = 90:

• NL10 bankroll floor: 30 × 10 = 300, or $300.
• NL25 floor, with the required buy-in count rounded upward: 30 × 25 = 750, or $750.
• With a bankroll of $800, the limited NL25 shot budget is $50, or two $25 buy-ins.
• At $750, stop the shot and return to NL10.
• If the next possible loss would cross the chosen bankroll floor, end the attempt beforehand.

Starting a shot requires more than enough money: reassess your play, opponents and rake. Your true win rate at NL25 is unknown. Carrying over the example value of 5 does not make it a measured rate.

Three useful planning points—the buy-in reserve for an attempt at each stake, the size of the attempt, and the plan for moving down—appear in Timothy Allin’s 888poker article dated 2019-10-03.

Original English 888poker checklist covering the reserve for a higher-stakes attempt, shot size, and plan for moving down

Source: Timothy Allin, 888poker, 2019-10-03. The image preserves the original 22-word English quotation; it is not a translation.

Do not replenish the shot budget during a losing attempt to chase losses. After moving down, review results and decision quality. This plan promises no timetable for rebuilding your bankroll.

How Should You Track Withdrawals, Results and Downswings?

Track money transfers separately from playing results, and recalculate available buy-ins after every deposit or withdrawal. The basic reconciliation is:

opening bankroll + deposits - withdrawals + net poker result = closing bankroll

Record the date, format, stakes, full tournament entry costs and fees, net result, volume played, and opening and closing balances. For cash games, record hands played; for tournaments, record paid entries.

A deposit is not profit. A withdrawal reduces your current reserve: withdrawing $100 from $500 leaves $400. At NL10, that is 400 / 10 = 40 full buy-ins. Recheck the calculation and stake rules after withdrawing.

Do not count table chips twice alongside a client balance that already includes them. An unavailable bonus is not a substitute for freely available funds. Living, emergency, tax and travel reserves stay outside the poker bankroll; there is no universal tax rule here for every reader.

A downswing is a period of unfavorable results; a drawdown measures the bankroll’s decline from an earlier level or peak. Such a period alone proves neither skill nor a lack of it. Review decisions, sample size and adherence to your budget.

A stop-loss helps limit spending and stop play when tilt affects decisions. It does not change outcome probabilities or turn a losing game into a profitable one. For fluctuations over a specified amount of play, use the variance simulator; for downswing analysis, see the poker variance and downswings guide. That is a different question from reaching zero over an unlimited horizon.

What Should You Do Before Your Next Session?

Before playing, write down your budget, calculation units and stopping rules. This keeps stake decisions from being made under the pressure of current results.

• Separate your bankroll from living funds and choose an amount you can afford to lose.
• Define the format and full buy-in cost: 100 big blinds for the cash example, or the entry plus fees for a tournament.
• Check that cash-model inputs are supported estimates or clearly stated assumptions.
• Set a session spending limit, permitted re-entries, and a short-shot budget if you plan one.
• Set a threshold for moving down, and do not let the next attempt take you through it.
• Keep records, separate deposits from profit, and recalculate your reserve after withdrawals or changes in conditions.

If the calculation calls for money you cannot afford to lose, choose lower stakes or do not play. Bankroll management helps control financial decisions; it does not guarantee profit.