civilequations.com
About CivilEquations
Free, professional-grade civil engineering calculators — built by a licensed P.E. for engineers in the field.
What Is CivilEquations?
CivilEquations is a free online reference tool built specifically for civil engineers, engineering technicians, and students who need fast, reliable results in the field or at the desk. Every calculator on this site was designed, verified, and documented by a licensed Professional Engineer with over three decades of hands-on experience in transportation and infrastructure design.
The goal is simple: reduce the friction between a design question and a verified answer. Whether you're confirming a stopping sight distance on a rural roadway, sizing a storm pipe using Manning's equation, or checking earthwork volumes against a field survey — CivilEquations gives you the calculation, the formula, and the engineering context in one place, at no cost.
This site is not affiliated with any software vendor, standards organization, or government agency. All calculators are provided as independent reference tools. Results should always be reviewed by a qualified engineer before use in a design or construction document.
Why CivilEquations?
PE-Verified Formulas
Every calculation based on AASHTO, FHWA, and HCM standards and reviewed by an active licensed Professional Engineer registered in Rhode Island, Massachusetts, and Connecticut.
Built for Speed
No accounts, downloads, or paywalls. Clean interfaces designed to get you from input to result in seconds.
Engineering Context
Each calculator includes formula references, variable definitions, and practical notes so you understand what the numbers mean — not just what they are.
About the Engineer
Licensed Professional Engineer
Rhode Island · Massachusetts · Connecticut · Civil Engineering · 35+ Years
CivilEquations was created and is maintained by a Professional Engineer licensed in Rhode Island, Massachusetts, and Connecticut, with more than 35 years of experience in civil engineering practice. The site grew out of decades of fieldwork, plan review, and design projects — and a recurring frustration with the lack of clean, fast, context-aware reference tools for working engineers.
Core areas of professional specialization include:
Professional experience spans municipal and government infrastructure, commercial and retail site development, and transportation corridor projects. The calculators on this site reflect the tools and methods used daily in that practice — adapted for quick, reliable use by engineers at any level.
The calculators and results provided on CivilEquations are intended as reference tools for qualified engineering professionals and students. They do not constitute engineering advice and are not a substitute for professional judgment. All results must be reviewed and verified by a licensed Professional Engineer before incorporation into any design, construction document, or permit application. CivilEquations makes no warranty, express or implied, regarding the accuracy, completeness, or fitness for a particular purpose of any calculation result.
Get in Touch
Have a question about a calculator, a formula, or a suggestion for a new tool?
✉ contact@civilequations.com