The Exacta is the most popular exotic wager in horse racing — and the easiest to learn. Pick the horses that finish 1st and 2nd in exact order, and you win. Payouts are calculated through the pari-mutuel pool, so even a $2 bet can return hundreds (or thousands) when a longshot places.
The challenge? Predicting the exact order gets expensive fast when you start boxing multiple horses. Use our free calculator below to determine the cost of your ticket before you head to the window — whether you’re playing a straight bet, a box, or a key wheel.
Box Cost Chart: 2 to 8 Horses
When you “box” horses, they can finish 1st or 2nd in any order. This removes the need to predict which horse wins — but the number of combinations (and cost) grows with each horse you add.
| # Horses | Combinations | $1 Cost | $2 Cost |
|---|---|---|---|
| 2 | 2 | $2 | $4 |
| 3 | 6 | $6 | $12 |
| 4 | 12 | $12 | $24 |
| 5 | 20 | $20 | $40 |
| 6 | 30 | $30 | $60 |
| 7 | 42 | $42 | $84 |
| 8 | 56 | $56 | $112 |
Combinations = n × (n - 1)Where n = number of horses boxed. Multiply by your stake for total cost.
Bet Types Explained with Examples
1. Straight Bet
The simplest wager. Pick one horse to win and one to place — in that exact order.
Cost ($2 stake): $2.00 — just one combination.
Risk: If they finish 2-5 instead of 5-2, you lose. No flexibility.
2. Box Bet
Removes the need to predict order. Pick a group of horses — any two of them finishing 1st-2nd in any combination wins.
Combinations: 3 × 2 = 6
Cost ($2 stake): $12.00
3. Key Wheel
Use this when you’re confident one horse will win but uncertain about second place. It’s significantly cheaper than boxing.
Covered: 3-2, 3-5, 3-9
Cost ($1 stake): $3.00
Compare: Boxing all 4 horses would cost $12 at $1. Keying saves $9.
4. Part Wheel
The most flexible option. Select different horses for 1st and 2nd position independently.
2nd: #3, #7, #8
Covered: 2-3, 2-7, 2-8, 5-3, 5-7, 5-8
Cost ($2 stake): $12.00 (2 × 3 = 6 combos)
Pro tip: You can also play the reverse (key in 2nd position) if you believe a horse will place but not necessarily win.
Exacta Box vs. Quinella: What’s the Difference?
This is one of the most common questions at the betting window. The short answer: they cover the same outcome but the math is different.
| Feature | Exacta Box ($1) | Quinella ($2) |
|---|---|---|
| What it covers | Two horses, either order | Two horses, either order |
| Cost (2 horses) | $2 (2 × $1 combos) | $2 (single bet) |
| Pool | Exacta pool (larger) | Quinella pool (smaller) |
| Payout when favorite wins | Usually lower | Often higher |
| Payout when longshot wins | Often higher | Usually lower |
| Can include 3+ horses? | Yes | No (only 2) |
Box vs. Key vs. Part Wheel: When to Use Each
✅ Use a BOX when:
- You like 3-4 horses but can’t separate them
- You have no strong opinion on who finishes 1st vs. 2nd
- Short field with fewer than 8 runners
✅ Use a KEY WHEEL when:
- One horse stands out clearly as the winner
- You want to save money vs. boxing
- Also consider keying a horse in 2nd (“underneath”) if it has “seconditis”
✅ Use a PART WHEEL when:
- Your confidence differs by position (e.g., 2 contenders to win but 4-5 for 2nd)
- Large field where boxing is cost-prohibitive
- You want maximum flexibility over your ticket structure
How Payouts Work (Pari-Mutuel)
Unlike sports betting where the payout is based on fixed odds, horse racing uses a pari-mutuel system. All bets on a given wager type go into a shared pool. The track takes its cut (called “takeout,” typically 18-25%), and the remainder is split among winning tickets.
This means your payout depends on two factors: how many people bet on the winning combination, and how large the total pool is. When a longshot finishes first, fewer people hold winning tickets, and the payout per ticket is larger. When favorites dominate, more tickets cash, and individual payouts are smaller.
Payout ≈ (Total Pool − Takeout) ÷ Winning Tickets × $2Actual payouts are displayed as “Probable Payoffs” on the tote board before the race. They update in real time as bets are placed.
How to Use This Calculator
- Bet Mode: Select Box or Wheel (Key)
- Horses: For a Box, enter the total number of horses. For a Wheel, enter the number of horses in 2nd position.
- Stake: Enter your base bet amount ($1 or $2 at most tracks)
- Calculate: See total combinations and ticket cost instantly
Ready for more complex exotics? Try our Trifecta Calculator (top 3 finishers) or Superfecta Calculator (top 4) to build out your full ticket.
Related Horse Racing Calculators
- Trifecta Calculator — Pick the top 3 finishers
- Superfecta Calculator — Pick the top 4 with $0.10 minimum
- Pick 6 Calculator — Winners across 6 consecutive races
- Kelly Criterion Calculator — Optimal bet sizing
- Exotic Bets Explained — Complete guide to all wager types
Frequently Asked Questions (FAQ)
What is the minimum stake?
How much does a 4-horse box cost?
n × (n-1) × stake where n = number of horses.