1. What is an Eighth Mile to Quarter Mile Calculator?

Definition: This calculator estimates a vehicle's quarter-mile elapsed time (ET) based on its eighth-mile performance.

Purpose: It helps drag racers and performance enthusiasts predict quarter-mile times when only eighth-mile data is available.

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 — Conversion factor (average multiplier)

Explanation: The eighth-mile time is multiplied by 1.45, which is the typical ratio between quarter-mile and eighth-mile times for most vehicles.

3. Importance of ET Conversion

Details: Many drag strips are only 1/8-mile long, making this conversion valuable for comparing performance to standard 1/4-mile times.

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 multiplier?
A: It's an average that works well for most street cars. High-powered drag cars may use 1.35-1.40, while stock cars might be closer to 1.50.

Q2: Can I use this for trap speed too?
A: No, this only converts elapsed time. Speed conversion requires a different formula.

Q3: Why doesn't this work for all vehicles?
A: Vehicles with different power curves (like turbocharged vs supercharged) may have different conversion ratios.

Q4: Where does the 1.45 factor come from?
A: It's derived from statistical analysis of thousands of drag racing time slips showing the average relationship between 1/8 and 1/4 mile times.

Q5: How can I get more accurate predictions?
A: For your specific vehicle, track actual 1/8 and 1/4 mile times to determine your personal conversion factor.