How to use the calculator
Choose two outcomes for an exhaustive A/B market or three for home/draw/away. Enter decimal odds above 1 for each outcome. The budget is the total of all stakes, in one common currency unit. Extra flat costs are entered separately and deducted from the net result.
Press Calculate after changing your inputs. The result shows each stake, the minimum payout after rounding, the total stake and calculated net. The example button returns to a teaching example; these are not live prices.
Read the smallest payout first
The relevant result is the smallest payout among all covered outcomes. Net = minimum payout − total stake − entered costs. A positive inverse-odds margin may disappear when rounding or costs are included.
At odds 2.15 and 2.20 with 1,000 units and no costs, the example returns at least 1,087.35, giving 87.35 calculated profit. Add 20 units of known costs and the same combination gives 67.35. Fees above 87.35 eliminate that positive minimum net.
The formula behind the allocation
S = 1/o₁ + 1/o₂ (+ 1/o₃). Before rounding, each stake equals B × (1/oᵢ) / S and the equal gross payout is B/S. For S < 1, the theoretical result before costs is positive. The tool uses whole hundredths of a currency unit and calculates the actual minimum payout of the displayed stakes.
The yield is calculated net divided by total stake. For example, 87.35 on 1,000 is 8.735%. This is neither a prediction of how much you will earn each day nor a probability of successful execution.
Worked 1X2 example
At odds 2.10 / 4.20 / 4.20, allocate 500 / 250 / 250 from a total stake of 1,000. Every normal covered match result then pays 1,050 before costs. With 10 units of extra costs, the calculated net is 40.
If the first price falls to 1.80, keeping the old 500 stake would pay only 900 for a home win. Recalculate the entire combination: the old positive result does not survive unchanged odds assumptions.
What the tool does not include
The calculator does not fetch prices or send bets. It cannot detect personal stake limits, available balances, settlement exceptions or currency conversion. Flat entered costs are only the costs you supply. An exchange’s commission on winnings and available liquidity must be assessed separately.
Only use mutually exclusive outcomes that cover the same market completely. Double chance, back/lay, handicaps with pushes and combinations of overlapping markets need a different outcome model. This simple calculator is not designed for them.
Questions before using a result
Why does the tool show no arbitrage? The sum of inverse odds may be at least 1, or the displayed rounded stakes and entered costs may leave no positive net. Raising your budget does not repair a fundamentally unprofitable set of prices.
Where are the best odds? This calculator uses manually entered prices for learning and checking. ArbiScan’s account-based odds comparison uses the shared central observations. Read the beginner and methodology guides to understand freshness, availability filters and the difference between estimates and settlement.
How much cost can the calculation absorb?
The default example with 1,000 and odds 2.15 / 2.20 produces a lowest calculated net of 87.35 before costs after rounding to cents. A fixed total cost of 20 reduces this to 67.35; a cost of 100 makes it −12.65. Commission that depends on the winning outcome cannot be replaced with an arbitrary flat estimate: calculate each outcome separately.