Package = Reaction Time + (Actual ET − Dial-In) | Lower package wins | Source: NHRA bracket racing rules & Wikipedia
Breakout = Actual ET < Dial-In (car ran faster than predicted) — driver loses unless opponent breaks out worse
Red light = Reaction Time < 0.000 — immediate disqualification (foul start)
MOV (feet) = Package difference × Winner's trap speed (mph) × 1.4667 | Conversion: 1 mph = 1.4667 ft/s (exact: 5280/3600)
How to Use This Calculator
This tool simulates a complete bracket drag race between two drivers using the same logic that the timing computers at the track use. Here's a step-by-step guide:
- Choose the track distance — most local strips run ⅛ mile (660 ft); NHRA bracket events are commonly ¼ mile (1,320 ft).
- Set the double-breakout rule — most clubs award the win to whichever driver breaks out by the least; some clubs DQ both.
- Enter Driver A's numbers — dial-in (the predicted ET you wrote on your window), the actual ET from your time slip, your reaction time (RT), and your trap speed in mph.
- Enter Driver B's numbers — same four data points from their slip.
- Hit Calculate — the tool instantly shows each driver's package, who won, any fouls, the margin of victory in seconds, and (if trap speed is provided) the estimated gap in feet at the stripe.
You can also use it before a race as a strategy tool: enter your historical dial-in, a target ET, and your expected RT to see what package you need to beat a known opponent.
When & Why Bracket Racers Use a Package Calculator
After a race — especially one you lost — it's common to be confused about why. You might have crossed the finish line first, run closer to your dial-in than your opponent did, and still lost. The package formula is the reason why.
A strong reaction time advantage can allow a driver to win even while running further off their dial-in. Conversely, a poor reaction time can cost you a race even when your car is dead-on the number. This calculator makes the math visible so you can identify exactly where you're leaving time (and wins) on the table.
Common Scenarios Explained
- Holeshot win: Driver B ran .325 over their dial-in but had an outstanding .062 RT. Driver A ran only .133 over but had a .270 RT. B's package (.387) beats A's (.403) — B wins despite being further off the number.
- Double breakout: Both drivers run quicker than their dial-ins. The standard rule awards the win to whoever broke out by the smaller margin (closest to their dial-in). Both packages go negative — the less-negative one wins.
- Red-light foul: Any negative RT (leaving before the green light) is a foul start. A red-light DQ overrides everything else — even a breakout by the opponent.
- Tie: If both packages are exactly equal and neither fouled, the race is a tie — essentially impossible with modern timing equipment accurate to 0.00001 seconds.
Understanding Package Numbers
A "perfect package" is 0.000 — the driver reacted with a perfect 0.000 RT and ran exactly their dial-in. In practice, even elite bracket racers average packages in the 0.020–0.060 range. A package under 0.020 is elite-level. New racers often see packages of 0.150–0.400+.
The package formula matters most in close races. On the stripe, where both cars are near 100+ mph, even a 0.010 package difference (ten thousandths of a second) translates to roughly 1.5 feet of physical separation.
Margin of Victory in Feet
The time-based MOV (package difference) can be converted to a physical distance using the winner's trap speed. The formula is:
MOV_feet = MOV_seconds × trap_mph × 1.4667
This is an approximation because it assumes both cars are travelling at trap speed at the finish line, which isn't exactly true. However, it's the standard method used in the bracket racing community and gives a realistic sense of the physical gap. At 130 mph, a 0.010-second package difference is approximately 1.9 feet.
Frequently Asked Questions
What is a bracket racing package?
A bracket racing package is the sum of a driver's reaction time and their ET deviation from their dial-in. Specifically: Package = RT + (ET − Dial-In). The lower the package number, the better. The driver with the lower package wins the round — provided neither has committed a disqualifying foul such as a red-light start or an absolute breakout. It's the single number that tells you how close to a perfect run each driver got, combining starting-line reflexes and car consistency into one figure.
What counts as a breakout in bracket racing?
A breakout occurs when a driver's actual elapsed time is numerically lower (faster) than their dial-in — meaning the car was quicker than predicted. In standard bracket rules, a breaking-out driver loses the round unless their opponent also breaks out by a greater margin (a "double breakout"). In some classes, such as NHRA Competition Eliminator, breakout rules don't apply at all. In other situations, "absolute breakout" limits exist (e.g. a Top Dragster faster than 5.999 seconds is immediately disqualified regardless of the opponent).
What is a holeshot win in drag racing?
A holeshot win happens when one driver wins despite running a slower elapsed time than their opponent. Because bracket racing uses a handicap start, a driver who cuts a significantly better reaction time can physically reach the finish line before a faster car, as long as they don't break out. The term describes winning "off the hole" (the starting line) purely through reaction-time advantage. It's completely legal and is one reason why reaction time training is critical in bracket racing — it gives the starting-line winner a lead they can choose to protect by feathering the throttle near the stripe if needed.
How is margin of victory calculated in bracket racing?
The time-based MOV is simply the difference between the two package scores: the winner's package subtracted from the loser's package. To convert this to a physical distance in feet at the finish line, multiply the MOV in seconds by the winner's trap speed converted to feet per second (trap MPH × 1.4667). For example, a 0.025-second MOV at a 125 mph trap speed equals roughly 4.6 feet. This is an approximation — it assumes both cars are traveling at roughly the trap speed at the stripe.
What is a perfect reaction time in bracket racing?
On modern NHRA and IHRA timing systems (which have used LED bulbs for years), a perfect reaction time is displayed as 0.000 on your time slip. This means your front tire broke the stage beam at the precise instant the green light activated. Older incandescent-bulb timing systems calibrated perfect reaction time as 0.500 seconds (sportsman/full tree) or 0.400 seconds (pro tree), but those values were already offset by the system. Any negative reaction time displayed on a modern slip indicates a red-light foul — you left before the green.
Does reaction time affect ET in bracket racing?
No — reaction time and elapsed time are measured completely independently. The ET clock starts the moment your front tire clears the stage beam, regardless of when the green light came on. A 5-second reaction time produces the same ET as a 0.040 reaction time if everything else is equal. However, RT affects your package and thus determines the winner. A great ET with a terrible RT can still lose — and vice versa.
What does "closest to the number" mean in a double breakout?
When both drivers break out (both run quicker than their dial-ins), the standard rule awards the win to whichever driver broke out by the smallest amount — i.e., whose ET was closest to (but still under) their dial-in. For example, if Driver A broke out by 0.012 seconds and Driver B broke out by 0.040 seconds, Driver A wins the double breakout. Some local clubs and bracket series instead DQ both drivers in a double breakout, which you can select in this calculator's options.
What is the handicap start in bracket racing?
The handicap start (also called the head start) is the difference between the two dial-ins. The slower car (higher dial-in number) is given the green light first, with the faster car's tree held for exactly that many seconds. If Driver A dials 12.50 and Driver B dials 10.80, Driver A gets a 1.70-second head start. Theoretically, if both run exactly their dial-ins, both cars cross the stripe at the same instant — turning a horsepower mismatch into a test of driver skill and car consistency.