Free betting calculator widgets

Put a TheRundown calculator on your own site. Copy one snippet below and paste it into your page. It is free to use and needs no sign-up. The widget sets no cookies and shows no ads; the only request it makes outside therundown.io is Cloudflare's cookieless page-speed beacon.

Each snippet includes a small credit line under the calculator. Please keep it, so your readers can find the full calculator.

The widget fits the column you put it in: two columns in a space 560 pixels or wider, one column in anything narrower, up to 720 pixels wide. It needs no script.

Parlay Calculator

Combined odds, payout and profit for a parlay with any number of legs.
<div style="container-type:inline-size;contain-intrinsic-inline-size:340px;max-width:720px">
<iframe src="https://therundown.io/embed/parlay-calculator" title="Parlay Calculator" loading="lazy" width="100%" height="660" style="display:block;border:0;border-radius:12px;height:clamp(420px,calc((560px - 100cqw) * 9999),660px)"></iframe>
<p style="margin:8px 0 0;font:13px/1.4 system-ui,sans-serif"><a href="https://therundown.io/betting-calculators/parlay-calculator">Parlay Calculator</a> by TheRundown</p>
</div>
Open the full Parlay Calculator

Bet Payout Calculator

Total payout and profit from the odds and your stake.
<div style="container-type:inline-size;contain-intrinsic-inline-size:340px;max-width:720px">
<iframe src="https://therundown.io/embed/bet-payout-calculator" title="Bet Payout Calculator" loading="lazy" width="100%" height="670" style="display:block;border:0;border-radius:12px;height:clamp(400px,calc((560px - 100cqw) * 9999),670px)"></iframe>
<p style="margin:8px 0 0;font:13px/1.4 system-ui,sans-serif"><a href="https://therundown.io/betting-calculators/bet-payout-calculator">Bet Payout Calculator</a> by TheRundown</p>
</div>
Open the full Bet Payout Calculator

Odds Converter

Convert between American, decimal and fractional odds and implied probability.
<div style="container-type:inline-size;contain-intrinsic-inline-size:340px;max-width:720px">
<iframe src="https://therundown.io/embed/odds-converter-calculator" title="Odds Converter" loading="lazy" width="100%" height="690" style="display:block;border:0;border-radius:12px;height:clamp(440px,calc((560px - 100cqw) * 9999),690px)"></iframe>
<p style="margin:8px 0 0;font:13px/1.4 system-ui,sans-serif"><a href="https://therundown.io/betting-calculators/odds-converter-calculator">Odds Converter</a> by TheRundown</p>
</div>
Open the full Odds Converter

Implied Probability Calculator

The win probability implied by any price, and the break-even rate.
<div style="container-type:inline-size;contain-intrinsic-inline-size:340px;max-width:720px">
<iframe src="https://therundown.io/embed/implied-probability-calculator" title="Implied Probability Calculator" loading="lazy" width="100%" height="530" style="display:block;border:0;border-radius:12px;height:clamp(330px,calc((560px - 100cqw) * 9999),530px)"></iframe>
<p style="margin:8px 0 0;font:13px/1.4 system-ui,sans-serif"><a href="https://therundown.io/betting-calculators/implied-probability-calculator">Implied Probability Calculator</a> by TheRundown</p>
</div>
Open the full Implied Probability Calculator

No-Vig Calculator

Remove the vig from a two-way or three-way market to get fair odds.
<div style="container-type:inline-size;contain-intrinsic-inline-size:340px;max-width:720px">
<iframe src="https://therundown.io/embed/no-vig-calculator" title="No-Vig Calculator" loading="lazy" width="100%" height="650" style="display:block;border:0;border-radius:12px;height:clamp(400px,calc((560px - 100cqw) * 9999),650px)"></iframe>
<p style="margin:8px 0 0;font:13px/1.4 system-ui,sans-serif"><a href="https://therundown.io/betting-calculators/no-vig-calculator">No-Vig Calculator</a> by TheRundown</p>
</div>
Open the full No-Vig Calculator

Hedge Calculator

The hedge stake and what you net on either outcome.
<div style="container-type:inline-size;contain-intrinsic-inline-size:340px;max-width:720px">
<iframe src="https://therundown.io/embed/hedge-bet-calculator" title="Hedge Calculator" loading="lazy" width="100%" height="700" style="display:block;border:0;border-radius:12px;height:clamp(480px,calc((560px - 100cqw) * 9999),700px)"></iframe>
<p style="margin:8px 0 0;font:13px/1.4 system-ui,sans-serif"><a href="https://therundown.io/betting-calculators/hedge-bet-calculator">Hedge Calculator</a> by TheRundown</p>
</div>
Open the full Hedge Calculator

Arbitrage Calculator

Stakes and guaranteed return for an arbitrage across books.
<div style="container-type:inline-size;contain-intrinsic-inline-size:340px;max-width:720px">
<iframe src="https://therundown.io/embed/arbitrage-calculator" title="Arbitrage Calculator" loading="lazy" width="100%" height="730" style="display:block;border:0;border-radius:12px;height:clamp(480px,calc((560px - 100cqw) * 9999),730px)"></iframe>
<p style="margin:8px 0 0;font:13px/1.4 system-ui,sans-serif"><a href="https://therundown.io/betting-calculators/arbitrage-calculator">Arbitrage Calculator</a> by TheRundown</p>
</div>
Open the full Arbitrage Calculator

Kelly Criterion Calculator

Bet size from the odds, your win probability and your bankroll.
<div style="container-type:inline-size;contain-intrinsic-inline-size:340px;max-width:720px">
<iframe src="https://therundown.io/embed/kelly-criterion-calculator" title="Kelly Criterion Calculator" loading="lazy" width="100%" height="750" style="display:block;border:0;border-radius:12px;height:clamp(490px,calc((560px - 100cqw) * 9999),750px)"></iframe>
<p style="margin:8px 0 0;font:13px/1.4 system-ui,sans-serif"><a href="https://therundown.io/betting-calculators/kelly-criterion-calculator">Kelly Criterion Calculator</a> by TheRundown</p>
</div>
Open the full Kelly Criterion Calculator

Expected Value Calculator

Expected value of a bet from the odds and your win probability.
<div style="container-type:inline-size;contain-intrinsic-inline-size:340px;max-width:720px">
<iframe src="https://therundown.io/embed/expected-value-calculator" title="Expected Value Calculator" loading="lazy" width="100%" height="650" style="display:block;border:0;border-radius:12px;height:clamp(410px,calc((560px - 100cqw) * 9999),650px)"></iframe>
<p style="margin:8px 0 0;font:13px/1.4 system-ui,sans-serif"><a href="https://therundown.io/betting-calculators/expected-value-calculator">Expected Value Calculator</a> by TheRundown</p>
</div>
Open the full Expected Value Calculator

All betting calculators