Precision sports analytics

Betting tools that
measure the edge.

A free, no-nonsense toolkit for finding value in betting markets. Convert any odds, test a price against your own read, size stakes with Kelly, strip the vig, and spot arbitrage - all calculated live, right here, nothing stored.

Open the toolsLive edges on InPlay Radar
5Live calculators
3Odds formats
0Sign-ups required
100%In your browser
01

Value Bet Finder

Compare an offered price against your own win probability. If your edge is positive, the bet has long-run value.

Value bet - your edge is 10.0% over the offered price.
Edge+10.0%
EV / unit+0.100
Fair odds2.00
Book implied45.5%
02

Odds Converter

Move between decimal, American, and fractional odds and read the implied probability for any price.

Decimal2.10
American+110
Fractional11/10
Implied prob.47.6%
03

Kelly Stake Calculator

Turn an edge into a disciplined stake. Pick full, half, or quarter Kelly to match your risk tolerance.

Kelly fraction

Most disciplined bettors stake a fraction of full Kelly to cut variance. Half Kelly keeps ~75% of the growth at a quarter of the swing.

Recommended stake$41.67
% of bankroll4.2%
Full Kelly8.3%
EV / unit+0.125
04

No-Vig & Margin

Strip the bookmaker margin from a two-way market to recover the fair, vig-free probabilities and prices.

Bookmaker margin4.7%
Fair A2.00 · 50.0%
Fair B2.00 · 50.0%

The fair (vig-free) odds strip the bookmaker margin out of the two prices, giving you a cleaner probability estimate to compare against any other book.

05

Arbitrage Check

Test two opposing prices for a guaranteed-profit arb and split your stake so every outcome pays the same.

Arbitrage - lock in 3.7% guaranteed across both books.
Stake on A$246.99
Stake on B$253.01
Payout (either)$518.67
Guaranteed profit+$18.67

How the math works

01

Implied probability

Every price carries a probability baked in. Decimal odds invert directly into the chance the market is pricing for that outcome.

implied = 1 / decimal odds
02

Edge & expected value

Value exists when your estimated win probability beats the price. EV is the average profit per unit if you placed the same bet over and over.

edge = (your prob × decimal) − 1
03

The Kelly criterion

Kelly sizes each stake in proportion to your edge so your bankroll grows fastest without risking ruin. Fractional Kelly trades a little growth for far smaller swings.

f = (b·p − q) / b
04

Removing the vig

Bookmakers build a margin into both sides of a market. Normalising the implied probabilities back to 100% recovers the fair line to compare across books.

fair prob = implied / Σ implied
05

Arbitrage

When two books disagree enough, the inverse odds across both sides sum to less than one - a guaranteed profit regardless of the result if you stake each side correctly.

1/odds A + 1/odds B < 1

Model accuracy benchmark

How the prediction models stack up.

Edge detection is only as good as the win probabilities feeding it. These are out-of-sample hit rates for the prediction models behind the analytics, measured against settled results. InPlay Radar runs the top performer across live markets.

Robin.aiTop
85.4%Highest out-of-sample hit rate across evaluated markets.
Macy.ai#2
80.1%Strong, consistent calibration on mainline markets.
Persie.ai#3
67.1%Baseline model - solid on liquid, high-volume markets.

Hit rate is the share of resolved predictions that landed on the correct side over the most recent evaluation window.

Live markets

Stop running the numbers by hand.

These calculators do the math on one bet at a time. InPlay Radar runs the same edge and value detection across live in-play markets in real time, surfacing the positive-EV lines the moment they appear.

Scan live markets on InPlay Radar

For analytics and informational use only. Nothing here is betting advice, and no outcome is guaranteed. Please bet responsibly and within your means, and only where it is legal to do so.