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The math the books, brokers, and exchanges hope you never bother to run yourself. Free, instant, no email required.

Sports

Odds & Moneyline Converter

Convert between American odds, decimal odds, and implied win probability — instantly, in either direction.

Converted
Decimal Odds
Implied Probability
Fractional (approx.)

Implied probability includes the sportsbook's built-in vig — it's what the odds imply, not necessarily the true probability.

Sports · Stocks

Kelly Criterion Calculator

Given your real edge and the odds offered, Kelly tells you the mathematically optimal fraction of your bankroll to risk.

Suggested Stake
Enter your numbers to calculate.

Full Kelly is aggressive and assumes your win-probability estimate is exactly right — which it rarely is. Most professionals bet a fraction of Kelly (often ¼ to ½) to reduce variance. This tool shows full Kelly; size down accordingly.

Crypto

Liquidation Price Calculator

Estimate the price at which a leveraged long or short position gets liquidated, based on your entry and leverage.

Estimated Liquidation Price
Enter your position details to calculate.

Simplified isolated-margin estimate — actual liquidation price varies by exchange (funding fees, exact maintenance margin tiers, cross vs. isolated margin). Use your exchange's own tool for exact numbers before trading.

Sports · Stocks · Crypto

Compounding ROI Calculator

See what a starting bankroll actually grows to over time at a given return rate — compounded, not simple interest.

Ending Balance
Enter your numbers to calculate.

Assumes a constant return rate every period, reinvested each time — real returns vary and are never perfectly consistent. For illustration only.

Sports · Auto-updates every 12 hrs

Weather Alert Games

Every NFL & college game this week, sorted worst weather first. Red rows are severe, orange is bad, yellow is moderately bad — everything else is clean. Indoor/dome games are excluded automatically.

Showing every outdoor game this week for each league — scroll within a column to see more.

Schedule via ESPN's public scoreboard feed; forecasts via Open-Meteo, matched to each game's kickoff time and venue. Unofficial data sources — always double-check close to kickoff.

Crypto · Live

Crypto Fear & Greed Index

A daily read on crypto market sentiment, from Extreme Fear to Extreme Greed. Extreme fear often means people are overselling; extreme greed often means people are getting careless.

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Extreme Fear Fear Neutral Greed Extreme Greed

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Live data via Alternative.me's public Fear & Greed Index API, updated daily. A sentiment gauge, not a signal to buy or sell on its own.

Sports · Live

NFL Odds Matrix

This week's real NFL lines, side by side across major books. The point isn't to help you bet more — it's so you can see the hold for yourself instead of taking our word for it. See how the math works →

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Odds via SportsGameOdds, cached and refreshed periodically — not tick-by-tick real-time. Lines move; always confirm the current number on the sportsbook itself before betting. NFL odds are only available during the season (roughly September–February).