About GarageCalcs

Who runs this site

GarageCalcs is run by Chris Jensen, an independent individual based in Florida. It is not a company. I started it because information people were looking for was missing or hard to find, and I wanted the numbers in simple tools that show their method. Where the site says “we”, that is me. You can reach me at rusticreckoner@gmail.com or through the contact page.

Why this site exists

A garage project runs on numbers: displacement and compression ratio, gear ratios and speedometer error, tire diameter and wheel offset, injector and pump sizes, paint and primer quantities, torque specs and bolt patterns. The answers exist in parts catalogs, service manuals and forum threads, but they are scattered, and a small arithmetic slip can cost a weekend or a part. GarageCalcs puts the working in one place and says plainly where a figure is an estimate.

What you will find here

• Engine: displacement, compression ratio, piston speed, horsepower and torque, cam timing, headers, coolant mix and rebuild cost.
• Fuel & Forced Induction: injectors, fuel pumps, carburetor CFM, boost and turbo airflow.
• Drivetrain: gear ratios, speedometer correction, driveshaft speed, drag strip estimates.
• Wheels & Tires: tire size comparison, plus sizing and wheel offset.
• Shop & Body: paint, filler, primer, powder coat, wire gauge, brake pedal ratio, budgets, shop heating and cleaning dilution.
• Converters & Lookups: torque specs, lug patterns, spark plug gaps, tap and drill sizes, hitch classes and compressor CFM.
• Finders: three short quizzes for blasting media, paint finishes and a first project car.

Where the numbers come from

Each calculator explains its method on the page. The engine and drivetrain tools use standard formulas, such as displacement from bore, stroke and cylinder count, compression ratio from swept and clearance volume and horsepower from torque and rpm. The lookup pages collect commonly published specifications. The how we calculate page explains our approach and its limits. Defaults, prices and typical amounts are examples, and your vehicle's own service manual and your products' labels have the last word.

What this site does not do

• It does not replace the factory service manual for your vehicle, or the instructions for your tools and materials. Read our disclaimer and safety notes.
• It does not give professional mechanical, engineering or engine-tuning advice, and it does not know your specific parts.
• It does not sell products or services, and it does not take payment to favor a brand.
• It is not affiliated with, endorsed by or sponsored by any manufacturer, retailer or organization named on it. Names appear only to identify products and standards.

Corrections

Standards, prices and rules change, and people who use the tools often spot a mistake before we do. If a result looks wrong or a page is out of date, use the Report an Issue form and name the calculator. If you want a tool that is not here, suggest it.

Part of the Calcs family

GarageCalcs shares its layout and standards with a group of free reference and calculator sites. You can see the others on the Meet the Calcs Family page.