Free Roulette Systems
Strategy Lab & Tools
Tools & calculators

Roulette tools that show the real math behind systems.

No hype. Just probability, expected value and streak risk – in your browser.

This tools hub is the “lab bench” for FreeRouletteSystems.com. Use these calculators to see the true odds, long-run expectations and losing-streak risks behind any roulette bet or system. They all run locally in your browser – no downloads, no sign-ups.

Start with the Probability Calculator for raw odds, move to the EV Calculator to translate that into money, and finish with the Losing Streak Calculator to see where progressions like Martingale and Fibonacci get truly dangerous.

🎡 European & American wheels 📊 Odds, EV & streak risk 🧠 Designed for system analysis

Roulette calculators

Roulette Probability Calculator

Choose wheel type, bet type and number of spins to see:

  • Odds
    Exact win / lose probabilities for each bet.
  • Hit chance
    Chance of hitting a result at least once in a session.
  • Wheel impact
    How European vs American wheels change the math.
Open Probability Calculator

Expected Value (EV) Calculator

Enter your stake and session length to find out:

  • EV per spin
    Average gain or loss per spin for your bet.
  • Session EV
    Long-run expected profit or loss over many identical sessions.
  • House edge
    House edge and RTP for each bet type and wheel.
Open EV Calculator

Losing Streak Calculator

Explore how often scary streaks appear and how they affect systems:

  • Streak odds
    Probability of hitting L losses in a row in N spins.
  • System stress
    Martingale & Fibonacci max bets and bankroll exposure.
  • Risk insight
    How streaks collide with table limits and finite bankrolls.
Open Losing Streak Calculator

How to use these tools together

A simple 3-step analysis flow

  1. Step 1
    Use the Probability Calculator to understand the raw odds and hit frequencies for your chosen bet.
  2. Step 2
    Use the EV Calculator to convert those odds into long-run money expectations for your stake and session length.
  3. Step 3
    Use the Losing Streak Calculator to see how often the kind of runs that break systems are likely to occur, and what they would do to your bankroll.

When you combine these three angles – odds, expectation and streak risk – roulette systems become much easier to judge without illusions.

Tools + systems + responsible play

These calculators are most powerful when used alongside the systems library and the responsible gambling guide. If the numbers here make you less excited about betting big or chasing losses, that’s a healthy reaction.

Remember: tools don’t change the house edge. They just make it visible.