1. What is an Eighth to Quarter Mile Calculator?

Definition: This calculator converts 1/8-mile elapsed time (ET) to estimated 1/4-mile elapsed time for drag racing applications.

Purpose: It helps drag racers and performance enthusiasts estimate quarter mile times based on eighth mile performance.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( ET_{1/4} \) — Quarter mile elapsed time (seconds)
• \( ET_{1/8} \) — Eighth mile elapsed time (seconds)
• \( 1.45 \) — Standard conversion factor

Explanation: The eighth mile time is multiplied by 1.45 to estimate the quarter mile time, accounting for typical vehicle performance characteristics.

3. Importance of ET Conversion

Details: Many drag strips are 1/8-mile long, but quarter mile times are the standard performance metric in drag racing.

4. Using the Calculator

Tips: Enter your vehicle's 1/8-mile elapsed time in seconds. The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is the 1.45 conversion factor?
A: It's a general estimate that works well for most street cars and mild race cars. High-powered drag cars may have different multipliers.

Q2: When would the conversion factor change?
A: The factor can range from 1.25 for top fuel dragsters to 1.6 for very slow vehicles. Adjust based on your vehicle's performance characteristics.

Q3: Does this work for trap speed too?
A: No, this only converts elapsed time. Trap speed conversion requires a different formula.

Q4: Why is the quarter mile time not exactly double the eighth mile?
A: Vehicles typically slow down in the second half of the quarter mile due to aerodynamic drag and other factors.

Q5: Can I use this for motorcycles?
A: Yes, but sport bikes might use a slightly lower multiplier (around 1.35-1.4) due to their different acceleration characteristics.