Copy betting: what it is and how to tail picks
By the Match Tail team ·
Copy betting, or tailing, is the simplest way to bet without building every pick yourself. It is also easy to do badly: chasing a stranger’s stake size, taking worse odds than they did, or trusting a record you cannot check. This guide covers how tailing works, the math that decides whether it works for you, and the rules we suggest to protect your bankroll.
What is copy betting?
Copy betting means placing the same bets as another bettor: the same game, the same pick, at close to the same odds. You size the stake to your own bankroll instead of theirs. It is also called tailing. The opposite, betting against someone’s picks on purpose, is called fading.
People tail for different reasons. Some do not have time to research every game. Some want to learn by watching how a more experienced bettor picks spots and sizes stakes. Either way, you are still the one placing the bet, on your own account, with your own money. That means the price you get and the stake you choose are your decisions.
This is the service Match Tail offers. In our own words: "Copy the bets we place. Match Tail notifies you exactly when to open or close a bet, so you follow the same sports bets we do as they happen."
How does tailing picks work in practice?
A pick names the game and the side, and a good one also gives the odds taken and a stake in units. You check the price at your sportsbook, decide whether it is still close enough, then place the bet at your own unit size. Afterwards you record it, so you can judge the results on your own numbers.
- Read the pick: game, market, side, odds taken and units.
- Check your sportsbook’s current price for the same market.
- Compare it with the worst price you decided in advance you would accept.
- Convert the units to your own stake, not the tipster’s dollars.
- Place the bet and log it: date, pick, odds you got, units, result.
Speed matters because prices move. When a well-followed bettor posts a pick, the line can shift before you place it. With Match Tail, you get an alert when to open or close each bet we place, so you can act on it quickly.
Why does the price you get matter when you copy a bet?
The price decides how often a bet must win to break even. If a pick is posted at +120 and you only get +105, you need to win 48.78% of the time instead of 45.45%. Over many bets, that gap can turn a profitable record into a losing one for you, even when you copy every pick exactly.
| Odds you get | Profit if it wins | Break-even win rate |
|---|---|---|
| +120 | $24.00 | 45.45% |
| +110 | $22.00 | 47.62% |
| +105 | $21.00 | 48.78% |
| +100 | $20.00 | 50.00% |
Break-even for plus odds = 100 ÷ (odds + 100)
+120: 100 ÷ 220 = 45.45%
+105: 100 ÷ 205 = 48.78%
Profit for plus odds = stake × (odds ÷ 100): 20 × 1.20 = $24.00, 20 × 1.10 = $22.00, 20 × 1.05 = $21.00, 20 × 1.00 = $20.00
Over 10 winning bets at $20: (24 − 21) × 10 = $30 less profit at +105
Set your limit before you look at the line, for example "no worse than +110". If the price has moved past it, skip the bet. Our guide on how to read American betting odds covers the break-even formula for minus odds too.
How do you size stakes when you copy someone else’s units?
Copy the number of units, never the dollar amount. If a tipster bets two units and their unit is $100, they stake $200. If your bankroll is $500 and your unit is 1%, your unit is $5, so your two-unit bet is $10. The risk to each bankroll is then the same.
| Bettor | Bankroll | Unit (1%) | Two-unit stake |
|---|---|---|---|
| Tipster (hypothetical) | $10,000 | $100 | $200 |
| You (hypothetical) | $500 | $5 | $10 |
| Another bettor (hypothetical) | $2,000 | $20 | $40 |
Each row uses unit = bankroll × 1% and stake = 2 × unit: 10,000 × 1% = $100, so 2 × 100 = $200; 500 × 1% = $5, so 2 × 5 = $10; 2,000 × 1% = $20, so 2 × 20 = $40. If you do not know a tipster’s bankroll, units still work: you only need your own. Our guide to bankroll management and betting units explains how to choose a unit size and when to recalculate it.
How do you judge a tipster before you tail them?
Look for a complete record in units, with every bet listed, including losses, the odds taken and a time stamp from before the game started. Then check the sample size. A short record says very little, because luck alone moves results a lot over a hundred bets at standard odds.
Profit per win: 100 ÷ 110 = 0.9091 units. Loss per loss: 1 unit
55 wins, 45 losses: (55 × 0.9091) − 45 = +5.00 units
Return on stakes: 5.00 ÷ 100 = 5.0%
52 wins, 48 losses: (52 × 0.9091) − 48 = −0.73 units
Three extra wins in a hundred separate a loss from a solid profit. Now look at luck. Assume independent bets and a bettor who exactly breaks even at -110, winning 110 ÷ 210 = 52.38% of the time on average. Then the standard deviation of their win count over 100 bets is √(100 × 0.5238 × 0.4762) = 4.99 wins. Using a normal approximation, about 95% of the time they land between 52.38 − 1.96 × 4.99 = 42.6 and 52.38 + 1.96 × 4.99 = 62.2 wins. A record of 55 wins sits well inside that range, so it does not prove skill on its own.
- Every bet listed, including losses and voids.
- Odds recorded at the time of the pick.
- Picks time-stamped before the game started.
- Stakes in units, so results are not inflated by bet size.
- Several hundred bets, not a hot week.
How do you copy bets without blowing your bankroll?
Use a fixed unit of 1% to 2% of your bankroll, cap how many units you risk in a day, and never raise stakes to win back losses. Skip any pick whose price has moved past your limit. Track your own results, at your own prices, because that is the record that decides your outcome.
Bankroll $1,000, unit $10
Four one-unit picks in a day: 4 × $10 = $40 at risk
If all four lose: 40 ÷ 1,000 = 4% of the bankroll
- Fix the unit before you start, and stake in units only.
- Set a daily cap, for example five units, and stop when you reach it.
- Do not chase. A larger stake after a loss increases the potential loss.
- Do not stitch copied picks into your own parlays. Our parlay math guide shows how the margin compounds.
- Review results monthly, in units, against the prices you actually got.
Copying a good bettor removes the research, not the risk. A pick can be sound and still lose, which our expected value guide explains with numbers. Only bet money you can afford to lose.
What else should you know?
What does tail and fade mean in betting?
To tail is to place the same bet as someone else. To fade is to bet the opposite side of their pick on purpose.
What does Match Tail do?
In our own words: "Copy the bets we place. Match Tail notifies you exactly when to open or close a bet, so you follow the same sports bets we do as they happen."
Do I need the same sportsbook as the person I copy?
Not always, but it helps. Prices differ between sportsbooks, so the same pick can need a different win rate to break even.
Only bet money you can afford to lose. If betting stops being fun, call or text the National Problem Gambling Helpline at 1-800-MY-RESET (1-800-697-3738).