📈 FREE Sports Betting Tracker & Staking Calculator

The Free Sports Betting Tracker That Serious Bettors Actually Need

Most bettors lose money not because they pick badly, but because they have no system. This free sports betting tracker gives you the same analytical tools used by professional sharp bettors — without spreadsheets, subscriptions, or sharing your data with anyone.

Log every wager, measure Closing Line Value (CLV), calculate your true betting ROI, and simulate how three proven staking strategies would have handled your exact same bets. Your data never leaves your device — it lives in your browser's localStorage, fully private.

How to Use This Staking & Profit Tracker

1. Log a wager — Enter the league, selection, odds you took, and your actual stake. Optionally add closing odds to track CLV.
2. Set your confidence — Enter your estimated win probability (%) to power the Kelly Criterion advisor and the Confidence vs Reality analytics.
3. Analyse your edge — View your running ROI, bankroll curve, CLV per bet, and compare your actual results against Flat, 5% Percentage, and Kelly Criterion simulations.

Staking Plans Explained

The tracker simulates three common staking plan strategies on your historical bets, letting you see which approach would have been most profitable given your exact record:

• Flat Staking ($100) — Bet the same fixed amount every single time. Simple and consistent, great for building a baseline.
• Percentage Staking (5%) — Bet a fixed percentage of your current bankroll. Automatically scales up when winning and de-risks during losing streaks.
• Kelly Criterion — Sizes bets based on your perceived edge vs. the odds. Mathematically optimal for long-run bankroll growth, but requires honest confidence estimates.

Frequently Asked Questions

What is Closing Line Value (CLV) in sports betting?

CLV measures whether your bet was placed at better odds than where the market settled (the closing line). A consistently positive CLV is the strongest predictor of long-term profitability — it proves you are identifying value before the market corrects.

How is betting ROI calculated?

ROI = (Total Profit ÷ Total Amount Staked) × 100. This tracker calculates it automatically, excluding push/void bets from the denominator for accuracy. A +5% ROI over 100+ bets is considered very strong.

How does the Kelly Criterion staking calculator work?

Kelly formula: f = (b × p − q) / b, where b = decimal odds − 1, p = your estimated win probability, and q = 1 − p. The result is the optimal fraction of your bankroll to bet. This tracker caps Kelly at 25% per bet to prevent catastrophic losses from overconfident estimates.

Is my betting data private?

Yes, completely. All your data is stored exclusively in your browser's localStorage and never sent to any server. Clearing your browser data or switching devices will reset the tracker. For backups, use your browser's developer tools to export localStorage.

Does this work with American odds AND decimal odds?

Yes. Enter American odds (e.g. -110, +150) or decimal odds (e.g. 1.90, 2.50) — the tracker auto-detects and normalises both formats for all CLV, profit, and strategy calculations.