Open source · MIT license · v0.1.0 on GitHub

AI for heavy civil
construction.

Free tools for estimating, scheduling, and proposals — built by contractors, for contractors. Use the AI, fork the code, contribute what you know.

Try the AI free → Open calculators Star on GitHub ☆

No account. No paywall. Bring your own API key or use rockmud.com directly.

18

Free construction calculators — trench volume, pipe flow, OSHA safety, markup, and more

75

Automated tests across Python 3.10–3.12, running on every pull request

60+

Construction terms in the searchable field glossary, from 811 to work zone

MIT

License. Free to use, fork, and build on. No strings. Forever.

What's in openmud

Everything in one place.

AI that knows heavy civil, calculators that work without an account, and a reference library built from public domain standards.

Multi-model AI (GPT-4o, Claude, mud1) tuned for underground utility and heavy civil. Ask about costs, pipe sizing, scheduling, trench specs, or anything construction — and get answers that make sense in the field.

Chat → openmud.ai/chat

18 construction calculators: trench volume, pipe flow (Manning's), OSHA trench safety, thrust blocks, markup and bid price, unit price builder, change orders, production rates, crew day cost, unit converter, and more. All client-side — works offline.

Calculators → openmud.ai/calculators

Structured reference for the field: OSHA 29 CFR 1926 Subpart P, 811 Blue Stakes guide, confined space standards, utility color codes, pipe specs, soil classification, Manning's n values, YouTube channels, construction news, and a 60-term glossary.

Resources → openmud.ai/resources

Directory of 50+ construction companies: Utah contractors, ENR Top 25 national, ESOP employee-owned firms, publicly traded contractors with tickers. Revenue data, ownership type, what ESOP means, and where the industry market is heading.

Companies → openmud.ai/companies

Python Tool Library

Standalone Python tools you can import into your own projects. Manning's equation, trench takeoff, thrust blocks, unit conversion, markup math, production rates, OSHA safety reference, bid tools. pip install coming. MIT license.

Tools → github.com/masonearl/openmud/tools

The whole thing is open source. Fork it, deploy your own instance, contribute better pricing data, build new tools, improve the AI prompts. 75 automated tests, GitHub Actions CI, issue templates, and a full contributor guide.

GitHub → github.com/masonearl/openmud

Calculators

The math, done right.

Every calculator runs client-side — no account, no server, no API key required. Works on your phone on the job site.

LF × width × depth → excavation CY, backfill, bedding, spoil with swell factor

Pipe Flow (Manning's)

Diameter + slope + n → GPM, CFS, velocity. Full and partial flow. Min velocity check.

Trench Safety (OSHA)

Type A/B/C soil × depth × method → slope setback, bench dims, shield requirements

Thrust Block Sizing

Pipe size + pressure + fitting type → thrust force and concrete bearing area

Markup & Bid Price

Direct cost + overhead + profit → bid price. Or reverse: bid → implied cost.

T&M or unit price basis → CO total with O&P and bond. Print-ready breakdown.

Production Rate

Rate/day × crew cost × equip → duration, cost/LF, total project direct cost

CY ↔ CF ↔ tons · PSI ↔ ft water · BCY ↔ LCY ↔ CCY and more

+ 10 more calculators →

Industry intelligence

Built for the whole industry.

Not just tools — a resource for understanding who the major players are and where the market is going.

Companies · ESOP

What is an employee-owned construction company?

ESOPs are reshaping heavy civil. Emery Sapp & Sons, Achen-Gardner, ESCO, Rummel, Sundt — why employee ownership matters for culture, retention, and bid competitiveness. Plain-language explanation of how it works and why contractors do it.

Market Data · IIJA

$55 billion for water. Where is all this infrastructure money going?

The Infrastructure Investment and Jobs Act is the largest infrastructure bill in U.S. history. Sewer/water grew 23.7% in 2024. Power +18.9%. Telecom +59.7%. See the full breakdown of where the money is flowing and which markets are growing fastest.

Safety · OSHA Subpart P

The complete OSHA trenching and excavation reference.

29 CFR 1926 Subpart P in plain language — soil classification table, required slope angles by type, competent person checklist, trench shield rules, and links to the full text. Public domain. Everything a super needs to know before anyone goes in a trench.

Safety · 811 / Blue Stakes

Call before you dig. Utah law, color codes, and the 5 steps.

811 is not optional. Utah Code 54-8a requires notification at least 3 business days before any excavation. Full guide: the 5 steps, utility color codes (all 9), what Blue Stakes doesn't cover, and how EPR works. Every excavator should know this cold.

Who it's for

Built for people who work in the dirt.

openmud is for the people who actually do the work — not generic AI with a hard hat sticker on it.

Estimators

Quick bid on 1,500 LF of 8" sewer in clay. Material, labor, equipment breakdown in seconds. Unit price builder with overhead and profit. Change order calculator. Production rate cost analysis. All without a subscription.

Project Managers & Supers

Phased construction schedule from scope. Proposal generator for clients. Trench safety reference when you need to remember the Type C slope angle at 2am before a morning pour. Crew day cost calculator for T&M work.

Field Engineers

Pipe flow calculations for storm drain sizing. Minimum slope for 6" PVC sewer. Thrust block bearing area for a 45° bend at 150 PSI. Grade and slope from two elevations. All of it on your phone, no account required.

Developers & Contech Builders

Fork the repo. Import the Python tools. Build on the API. The estimating, hydraulics, safety, and bid math functions are standalone and MIT licensed — use them in your own apps, scripts, and workflows. No vendor lock-in.

Open source

The construction industry deserves open tools.

Most construction software is expensive, locked down, and built by people who've never been on a job site. openmud is the opposite — free, open source, built in the field and for the field. Your experience is worth more than our code. Submit a PR with better pricing data. Open an issue with a field problem that needs a tool. Fork it and build what your company actually needs.

Star on GitHub → How to contribute Join the discussion

Mission

Make AI a practical tool
for every phase of the job.

From bid to closeout. The pricing data, the field math, the safety standards, the company intel — all of it open, free, and getting better because people who actually know construction are contributing to it. That's what openmud is building toward.