Strike Rate Calculator

This strike rate calculator finds the break-even hit rate any American odds price demands for NFL, NBA, MLB, and NHL bettors - the exact share of your bets you must win at odds like -200 or +150 to stay even, as a percentage.

What Is Strike Rate?

Strike rate is the percentage of your bets that win. On its own, that number tells you little - what matters is comparing it to the break-even strike rate a price demands, the win percentage at which you neither gain nor lose. Every American odds price carries its own break-even mark, which is simply the odds’ implied probability. Favorites carry a high break-even strike rate because they are expected to win more often, while longshots carry a low one because they win less often. Betting favorites priced at -200 demands a punishing 66.7% strike rate just to stay level, while betting +300 longshots needs only 25% to do the same job.

Once you know the required rate for a given price, every selection becomes a clearer question. It stops being just “will this bet win?” and becomes “will my strike rate on bets like this clear the bar the price sets?” Instinct usually judges a strike rate in isolation, when it only means something once measured against the price that produced it.

This is also where strike rate differs from a plain win-loss record. A record simply counts what already happened and looks backward. Strike rate looks forward: it sets the target you need to hit before you place the bet, based on the price you are offered.

How Strike Rate Is Calculated

The break-even strike rate is the implied probability built into the price itself, and how you calculate it depends on whether you are backing a favorite or an underdog. For a favorite, priced with negative odds, the formula is the absolute value of the odds divided by the absolute value of the odds plus 100. Run a price of -200 through that formula and it works out to a break-even strike rate of 66.7%. A shorter favorite at -110 works out to 52.4%.

For an underdog, priced with positive odds, the formula flips to 100 divided by the odds plus 100. A price of +150 works out to 40.0%, a bigger price of +300 works out to 25.0%, and a price of +500 works out to 16.7%.

Either direction, the result answers the same question: the exact share of bets at that price you must win to come out even. Win at a higher rate than that break-even number over a run of bets at those odds, and you turn a profit; win at a lower rate, and you lose money over time. The calculation does not care how a price is written - it only cares what probability the price implies, so a -200 favorite and a +150 underdog are each judged against their own break-even number, never against each other’s.

What the Calculator Shows You

Enter an American odds price and the calculator returns the decimal odds equivalent alongside the break-even strike rate - the exact win percentage that price requires before you turn a profit. That break-even figure is the headline number: it is the line your actual results need to clear. From there, you can hold your own strike rate up against the break-even mark to see whether you are ahead of the target, right on it, or falling short. Because the same output format applies at any price, you can check a heavy favorite and a big longshot side by side and see how differently they treat the same actual hit rate. The calculator does not track your results for you - it only tells you, for any price, the number your results must beat.

Worked Example

Take a bettor who backs underdogs at +150 and wants to know what strike rate keeps them even. Converted to decimal odds, +150 is 2.50. Run that price through the formula for positive odds - 100 divided by the odds plus 100 - and the break-even strike rate comes out to 40.0%.

That means a +150 bettor has to win 40% of these bets just to break even, with no profit and no loss left over. Anything above that rate turns a profit; anything below it loses money over time, no matter how the individual results feel.

Hit 45% of +150 bets and the bettor is comfortably ahead of the 40.0% break-even line, banking real profit over the long run. Hit 35% instead, and that same bettor is losing money, even though winning barely more than a third of their bets does not intuitively feel like a poor result. That gap between how a record feels and what it actually means is exactly why the break-even strike rate matters: without it, a 35% hit rate and a 45% hit rate look similarly unremarkable side by side, when one is a losing strategy and the other is comfortably profitable.

The wider principle holds along the odds line: the longer the odds a bettor takes, the lower the strike rate they can survive on and still turn a profit. Knowing the exact break-even number for +150, rather than estimating it, is what lets this bettor judge a 45% run or a 35% run correctly instead of relying on a gut sense of whether the results look good or bad.

Break-Even Strike Rate by Price

The break-even strike rate moves with the price: shorter odds demand a much higher hit rate, longer odds a much lower one. A -200 favorite requires 66.7% just to break even, while a -110 price requires 52.4%. An even-money +100 line sits exactly at 50.0%, and the underdog prices below show how quickly the bar drops: 40.0% at +150, 25.0% at +300, and just 16.7% at +500.

Strike Rate Needed vs a Comfortable Margin

Break-even is the floor, not a target worth settling for - it is the point where a bettor makes nothing at all, so most want cushion above it before calling a price worth playing. The table below sets the break-even percentage for three common prices next to a comfortable margin above that line, high enough that ordinary variance is unlikely to drag results back down.

When a Low Strike Rate Is Actually Winning

The most counter-intuitive part of strike rate is that a low number can be an outstanding result, while a high number can be a losing one. A bettor who hits 30% of their +300 longshots is crushing the market, because the break-even mark at +300 is only 25% - they are winning meaningfully more often than the price requires. Meanwhile, a bettor winning 60% of their -200 favorites is actually losing money, because -200 demands 66.7% just to break even, and 60% falls short of that bar.

This is why a strike rate on its own tells you almost nothing - the same percentage can be a triumph at one price and a disaster at another. A 30% strike rate sounds low next to a 60% strike rate, yet the 30% bettor is the one turning a profit.

Variance compounds the problem, and it bites hardest on low-strike-rate strategies. Winning only one bet in four, as a +300 longshot bettor does even when performing well, means long dry spells between wins. A genuinely profitable longshot approach can still produce a losing stretch far longer than a favorites-based approach would, simply because the wins are spaced further apart. A longshot strategy needs a deeper bankroll to survive those gaps, even when the underlying strike rate is comfortably ahead of break-even.

When Strike Rate Makes Sense

Strike rate is most useful as a planning tool, applied before you place a bet rather than only after. If you tend to back favorites around -200, you can ask honestly whether you can sustain a 66.7% win rate over a long run, and if the answer is no, that tells you something before the bankroll takes the hit. The same check works in reverse: a bettor drawn to longshots at +300 or +500 should confirm they can tolerate the swings that come with needing only 25.0% or 16.7% to break even.

Bankroll management follows directly from this. A favorites-heavy approach clears its break-even bar more often, so results run smoother and more predictable, but the margin for error is thin - a modest drop below 66.7% turns a solid strategy into a losing one. A longshot-heavy approach can absorb a much lower hit rate and still profit, but it needs a bankroll built to survive extended losing streaks between the wins that make it work.

Strike rate makes the most sense as a filter applied consistently, price by price, rather than one number chased across every bet. A bettor who tracks actual hit rate at -110, at +150, and at +300 separately, comparing each to its own break-even line, learns more than one tracking a single blended rate across every bet placed. When a strategy’s real strike rate sits comfortably above its break-even mark, that is the signal worth trusting.

Common Mistakes

Reading a low strike rate as automatically bad, without first checking the odds it was earned at, leads to misjudging genuinely profitable longshot strategies as failures. Chasing favorites because their strike rate looks high ignores that a high break-even bar, like the 66.7% required at -200, can be hard to sustain over the long run. Forgetting that longshot strategies need a deeper bankroll to survive the dry spells between wins can turn a profitable approach into one that runs out of money before it pays off. Comparing strike rates across very different price ranges as though they mean the same thing overlooks that each price sets its own separate bar to clear.

Strike Rate vs the Price It’s Judged Against

The same strike rate can be a winning number or a losing one depending purely on the price it was earned at. A 30% strike rate is a disaster at -200 but a strong profit at +300, while a 60% strike rate is a loss at -200 and dominant at +300. The table below shows both prices judged against the same two actual strike rates.