Free Bankroll Management Calculator

Why Bankroll Management Matters

Bankroll management is the difference between a winning strategy that makes money and a winning strategy that goes broke. Even bettors with a proven edge can lose 10-15 bets in a row during a cold streak. Without disciplined staking, a bad run can wipe out weeks of profits or your entire bankroll.

The #1 mistake new bettors make is sizing bets based on feelings. After a win, they bet bigger because they are on a roll. After a loss, they bet bigger to chase what they lost. Both behaviors amplify variance and accelerate ruin. A fixed unit system removes emotion from the equation and lets the math work in your favor over time.

Professional bettors treat their bankroll like a business asset. They set a unit size, stick to it, and let their edge compound over hundreds of bets. The goal is not to win any single bet. The goal is to stay in the game long enough for your edge to play out.

Staking Strategies Compared

Flat Betting

Flat betting means wagering the same fixed amount on every bet, regardless of confidence or odds. If your unit is $20, every bet is $20. This is the simplest and most popular approach.

Pros: Easy to implement. Consistent and predictable. No complex calculations. Works well for most recreational and intermediate bettors.
Cons: Does not account for varying levels of edge. A bet where you have a 10% edge gets the same size as one with a 2% edge.

Percentage-Based

Percentage-based staking sets each bet as a fixed percentage of your current bankroll. If your bankroll is $1,000 and you use 3%, your first bet is $30. If you win and your bankroll grows to $1,030, your next bet is $30.90.

Pros: Self-correcting. Your bets grow when you are winning and shrink when you are losing, protecting your downside automatically.
Cons: Slower growth during hot streaks compared to flat betting. Requires tracking your running bankroll total.

Kelly Criterion

The Kelly Criterion is a formula that calculates the mathematically optimal bet size based on your edge and the odds. It maximizes long-term bankroll growth by betting more when your edge is larger and less when it is smaller.

Pros: Maximizes expected growth. Accounts for both edge size and odds. Theoretically the best long-term strategy.
Cons: High variance at full Kelly. Requires accurate probability estimates for every bet, which is extremely difficult. Overestimating your edge leads to over-betting and potential ruin.

Recommendation: If you use Kelly, stick with Half Kelly (bet half of what the formula suggests). This sacrifices a small amount of expected growth for a massive reduction in variance and risk of ruin.

How Betvisors Uses Units

Every pick on Betvisors is denominated in units, typically on a 1u to 5u scale. A 1-unit play is a standard bet with average confidence. A 5-unit play means the advisor has maximum confidence in that selection. This system standardizes bet sizing across different bankroll sizes.

When you see an advisor post a 3u play, you know exactly how to size your bet using this calculator. If your unit is $20, a 3u play costs $60. If another bettor has a $50 unit, their 3u play costs $150. Both bettors are taking the same proportional risk relative to their bankrolls.

This is why tracking profit in units is more meaningful than tracking dollar amounts. An advisor who is up +25 units has generated real edge regardless of what a unit means in dollar terms. You can use this calculator to translate unit-based results into what they mean for your specific bankroll.

Common Bankroll Mistakes

Over-betting: Risking 10-20% of your bankroll on a single bet. Even with a 55% win rate, you can hit a 10-bet losing streak. At 10% per bet, that is half your bankroll gone.

Chasing losses: Doubling your bet size after a loss to make it back. This is the fastest path to going broke. Each bet should be sized independently based on your system, not on what happened before.

No tracking: Not keeping records of bets, unit sizes, and running bankroll. Without data, you cannot evaluate whether your strategy is working or how much variance is affecting your results.

Emotional sizing: Betting more on games you care about or less on sports you do not follow closely. Your unit size should be based on your edge estimate, not your emotional attachment to the outcome.

Related Tools & Guides

• EV Calculator — Find your edge before sizing your bet with Kelly Criterion.
• Odds Converter — Convert odds formats for accurate staking calculations.
• Parlay Calculator — Size your parlay bets appropriately.
• Most Profitable Sports Betting Strategy — Bankroll management in the context of a winning system.
• Today's Picks — See unit-sized picks from verified advisors.