🎲 Martingale Calculator

Enter initial bet, multiplier, and losing-streak length to calculate the bet size at each step and cumulative loss. Martingale is not a winning strategy.

🚨 Under Martingale, bet size grows exponentially with each consecutive loss and can lead to bankruptcy very quickly. Do not apply this to real money management.

Cumulative Loss (after N losses)

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Next Bet (N+1)

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Bet Size & Cumulative Loss by Streak

Losing Streak	Bet at This Step	Cumulative Loss

⚠️ Martingale is NOT a "winning system." It does not improve your win rate — with finite bankroll and betting limits, it is an exponentially growing loss structure with a very high probability of ruin.

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GUIDE

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What is the Martingale strategy?

Martingale doubles (or multiplies) your next bet after every loss, so that a single win recovers all prior losses plus a profit equal to the original bet. Bet at step n = initial × multiplier^(n−1); cumulative loss after N straight losses = initial × (multiplier^N − 1) ÷ (multiplier − 1). With a 10,000 initial bet at 2x, 10 straight losses produce a cumulative loss of 10,000 × (2^10−1) = 10,000 × 1,023 = 10,230,000.

Why it grows exponentially dangerous

At 2x, the bet size doubles with each loss — after 10 losses it's 1,024x the original, and after 15 it's 32,768x. Even in a fair 50/50 game, a 10-loss streak (~0.1% chance per attempt) will eventually occur if you play long enough, and when it does the loss is unmanageable. Most casinos and exchanges also cap maximum bet size, which breaks the doubling strategy entirely once you hit the limit.

Why it's not a winning system

Martingale does not change the underlying win probability of any game. It only defers and inflates losses, and only "works" under the unrealistic assumption of infinite bankroll and no betting limit. In reality, finite funds and betting caps mean a long losing streak either bankrupts you or hits the limit, locking in the loss.

Frequently asked questions

What's the loss after 10 straight losses at 10,000 initial, 2x multiplier?

Cumulative loss = 10,000 × (2^10 − 1) = 10,000 × 1,023 = 10,230,000. The next (11th) bet would be 10,240,000.

Does Martingale improve my win rate?

No. It has zero effect on the underlying win probability of any game — it only resizes bets so a single win recovers prior losses.

What does entering a bankroll show me?

It highlights in the table exactly which losing streak causes cumulative loss to exceed your entered bankroll — useful for gauging how much you could realistically absorb.

Should I use this strategy for real investing or gambling?

Not recommended. Martingale's loss grows exponentially with a losing streak, and with finite funds and betting limits the risk of ruin is very high. It is not a winning system — proceed only with careful judgment.