フォーキャスト計算機 - 競馬連勝式ベット
無料フォーキャスト計算機。競馬のストレート・リバースフォーキャストのペイアウトを計算。
この計算機の使い方
- フォーキャストタイプを選択 — ストレート(特定の1-2順序)またはリバース(両方の順序)
- 1位に選んだ馬のオッズを入力
- 2位に選んだ馬のオッズを入力
- 単位ベットを入力
- 合計ベット、結合オッズ、リターン、利益を表示
公式
結合オッズ = オッズ₁ × オッズ₂
ストレートフォーキャスト: 1ベット、合計ベット = 単位ベット。
リバースフォーキャスト: 2ベット(両方の順序)、合計ベット = 2 × 単位ベット。正しい順序のみ勝つ;支払い = 単位ベット × 結合オッズ。
よくある質問
What is a forecast bet?
A forecast (also called exacta in the US) is a bet on which two horses will finish 1st and 2nd in a race. A straight forecast requires the exact order; a reverse forecast covers both orders for double the stake.
How is forecast different from each-way?
Each-way is two independent bets (one to win, one to place) on a single horse. A forecast is a single bet specifying the relationship between two horses’ finishing positions. Forecasts pay much more but have lower probability of winning.
Should I use straight or reverse forecast?
Use straight if you have a strong opinion on which horse wins. Use reverse if you think two horses will fill 1st and 2nd but you’re unsure of the order — you double your stake but cover both possibilities.
Are forecast odds the same as the multiplied book odds?
Most UK bookmakers use Computer Straight Forecast (CSF) dividends declared by Tote/SP, not pure multiplied odds. Multiplied odds are a useful approximation but actual payouts can differ by ±10-20% depending on the field strength formula used.