How to Use
Quick Start:
  • Enter your vehicle's horsepower and weight
  • Add weather conditions for accurate results
  • View real-time calculations below
Advanced Tools:
Engine Building: Compression ratios, displacement, airflow
Performance Calcs: Fuel requirements, turbo sizing
Tech Articles: Professional tuning guides

Quarter Mile Performance Calculator

Calculate ET times, trap speeds, gear ratios, and horsepower with atmospheric corrections

Tools & Resources
Auto: 15%, Manual: 12% | Converter slip defaults to 0%
Enter ZIP for local weather or leave empty for GPS
DENSITY ALTITUDE
--
WATER GRAINS
--
gr/lb
Fuel Requirements Calculator
Turbo Sizing Calculator
Optional - defaults to 85%
Static Compression Ratio
COMPRESSION RATIO
--
:1
Dynamic Compression Ratio
DYNAMIC COMPRESSION RATIO
--
:1
Rod-to-Stroke Ratio
ROD-TO-STROKE RATIO
--
:1
Mean Piston Speed
MEAN PISTON SPEED
--
ft/min
Engine Displacement
DISPLACEMENT (CI)
--
ci
DISPLACEMENT (L)
--
L
Volumetric Efficiency
VOLUMETRIC EFFICIENCY
--
%
Engine Airflow Requirement
AIRFLOW REQUIREMENT
--
CFM
Boost Required for Target HP
BOOST REQUIRED
--
PSI

Performance calculators will be available here.

Tech Articles
Jul 22, 2025
Why Your VE Table Is Lying to You: The Truth About MAP Sensor Scaling in Holley EFI

Learn why your VE table becomes inaccurate after changing MAP sensors and how Holley EFI users can avoid fueling errors with proper scaling. Fix it with our VE

Jul 21, 2025
How to Choose the Right Fuel Injectors for Boosted Gas, E85, and Methanol Builds

Learn how to choose the right fuel injectors for gas, E85, and methanol setups. Covers sizing, tuning tips, and what matters most when selecting injectors.
Jul 20, 2025
Holley EFI Troubleshooting: The Complete Professional Guide

Master Holley EFI troubleshooting with this comprehensive guide covering common issues, installation mistakes, sensor problems, and tuning solutions.
Jul 19, 2025
Front Tire Pressure: The Most Overlooked Factor Costing You ET

Learn how front tire pressure affects launch performance, weight transfer, and trap speed in drag racing.
Jul 18, 2025
Drag Racing Shock Technology & Tuning 🏁

Learn how drag racing shock technology affects launch, traction, and consistency. Discover the differences between single, double, and four-way adjustable shock
Jul 12, 2025
How Density Altitude Affects ET Times in Drag Racing

Learn how atmospheric density altitude impacts quarter mile ET performance and discover proven tuning strategies for varying weather conditions.
Jul 08, 2025
Trap Speed vs Horsepower: The True Power Indicator

Discover why trap speed is the most accurate measure of engine power in drag racing.
Jul 05, 2025
Gear Ratio vs Shift Point Optimization

Master gear ratio selection and shift point optimization to maximize quarter mile performance.
Jul 02, 2025
Convert Crank HP to Wheel HP: Understanding Drivetrain Losses

Learn how to accurately convert between crank horsepower and wheel horsepower.
Jun 28, 2025
Why Weather Matters in Drag Racing

Discover how atmospheric conditions dramatically affect drag racing performance.
Performance Results

Live calculations update as you adjust parameters

1/8 Mile Performance
E.T.
--
seconds
TRAP SPEED
--
mph
1/4 Mile Performance
E.T.
--
seconds
TRAP SPEED
--
mph
Starting Line Ratio (SLR)
EFFECTIVE RATIO
--
:1

Eighth Mile
Enter vehicle data to see analysis
Quarter Mile
Enter vehicle data to see analysis
All calculations are for estimation purposes only and should not be used in lieu of real testing.