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Appendix A
This chart converts various odds formats to break-even percentages.
Decimal Odds Fractional Odds American Odds
Break-even Percentage 100 99/1 +9900 1% 50 49/1 +4900 2% 33.33 97/3 +3233 3% 25 24/1 +2400 4% 20 19/1 +1900 5% 16.67 47/3 +1567 6% 14.29 13.3/1 +1329 7% 12.5 23/2 +1150 8% 11.11 10.1/1 +1011 9% 10 9/1 +900 10% 9.09 8.1/1 +809 11% 8.33 22/3 +733 12% 7.69 6.7/1 +669 13% 7.14 6.1/1 +614 14% 6.67 17/3 +567 15% 6.25 21/4 +525 16% 5.88 4.9/1 +488 17% 5.56 4.6/1 +456 18% 5.26 4.3/1 +426 19% 5 4/1 +400 20%
Decimal Fractional American Break-even Odds Odds Odds Percentage 4.76 3.8/1 +376 21% 4.55 3.6/1 +355 22% 4.35 3.4/1 +335 23% 4.17 3.2/1 +317 24% 4 3/1 +300 25% 3.85 2.9/1 +285 26% 3.7 2.7/1 +270 27% 3.57 2.6/1 +257 28% 3.45 2.5/1 +245 29% 3.33 2.3/1 +233 30% 3.23 2.2/1 +223 31% 3.13 2.1/1 +213 32% 3.03 2/1 +203 33% 2.94 1.9/1 +194 34% 2.86 1.9/1 +186 35% 2.78 1.8/1 +178 36% 2.7 1.7/1 +170 37% 2.63 1.6/1 +163 38% 2.56 1.6/1 +156 39% 2.5 1.5/1 +150 40% 2.44 1.4/1 +144 41% 2.38 1.4/1 +138 42% 2.33 1.3/1 +133 43% 2.27 1.3/1 +127 44% 2.22 1.2/1 +122 45% 2.17 1.2/1 +117 46% 2.13 1.1/1 +113 47% 2.08 1.1/1 +108 48% 2.04 1/1 +104 49% 2 1/1 ±100 50%
Decimal Fractional American Break-even Odds Odds Odds Percentage 1.96 1/1 -104 51% 1.92 1/1.1 -108 52% 1.89 1/1.1 -113 53% 1.85 1/1.2 -117 54% 1.82 1/1.2 -122 55% 1.79 1/1.3 -127 56% 1.75 1/1.3 -133 57% 1.72 1/1.4 -138 58% 1.69 1/1.4 -144 59% 1.67 1/1.5 -150 60% 1.64 1/1.6 -156 61% 1.61 1/1.6 -163 62% 1.59 1/1.7 -170 63% 1.56 1/1.8 -178 64% 1.54 1/1.9 -186 65% 1.52 1/1.9 -194 66% 1.49 1/2 -203 67% 1.47 1/2.1 -213 68% 1.45 1/2.2 -223 69% 1.43 1/2.3 -233 70% 1.41 1/2.5 -245 71% 1.39 1/2.6 -257 72% 1.37 1/2.7 -270 73% 1.35 1/2.9 -285 74% 1.33 1/3 -300 75% 1.32 1/3.2 -317 76% 1.3 1/3.4 -335 77% 1.28 1/3.6 -355 78% 1.27 1/3.8 -376 79% 1.25 1/4 -400 80%
Decimal Fractional American Break-even Odds Odds Odds Percentage 1.23 1/4.3 -426 81% 1.22 1/4.6 -456 82% 1.2 1/4.9 -488 83% 1.19 4/21 -525 84% 1.18 3/17 -567 85% 1.16 1/6.1 -614 86% 1.15 1/6.7 -669 87% 1.14 3/22 -733 88% 1.12 1/8.1 -809 89% 1.11 1/9 -900 90% 1.1 1/10.1 -1011 91% 1.09 2/23 -1150 92% 1.08 1/13.3 -1329 93% 1.06 3/47 -1567 94% 1.05 1/19 -1900 95% 1.04 1/24 -2400 96% 1.03 3/97 -3233 97% 1.02 1/49 -4900 98% 1.01 1/99 -9900 99%