CalcRigThe calculator built for trade professionals
CalcRig: Built for the trades. Fast, accurate, and designed for job-site conditions. No more fumbling with generic calculators or paper tables.
Features
Everything you need on the job site
Purpose-built calculators that understand trade-specific requirements — no more generic math apps that waste your time.
Material Estimation
Calculate exact material quantities for any project — lumber, drywall, concrete, pipe, wire, and more. Minimize waste and save money.
Unit Conversions
Instantly convert between imperial and metric, plus trade-specific units like board feet, wire gauge, BTU, and pipe schedules.
Code-Compliant Calculations
Built-in NEC, IRC, and mechanical code references ensure your calculations meet current building standards.
Offline Ready
Every calculator works without internet — because job sites don't always have signal. Your data syncs when you're back online.
Save & Share Results
Save calculation history, export to PDF, and share results with your team or clients directly from the app.
Job Cost Tracking
Track material costs across projects. Get real-time pricing estimates and stay on budget with built-in cost calculators.
Built for Tough Conditions
Large touch targets, high-contrast display mode, and glove-friendly interface designed for real job-site use.
Custom Formulas
Create and save your own calculation templates for recurring project types. Share custom formulas across your team.
Built for your trade
Specialized tools for every trade professional
Construction
Framing, concrete, roofing, and general construction calculations trusted by contractors and builders.Stud & Joist Spacing
Calculate on-center spacing, load-bearing requirements, and span tables for residential and commercial framing.
Concrete & Masonry
Volume calculators for footings, slabs, walls, and columns. Includes rebar spacing and mix ratio calculations.
Roof Pitch & Rafter
Compute roof pitch, rafter length, ridge height, and material quantities for any roof geometry.
HVAC
Heating, ventilation, and cooling calculations for installers and service technicians.Load Calculations
Manual J heating and cooling load calculations for residential and light commercial buildings.
Duct Sizing
Calculate duct dimensions, airflow rates, and static pressure for balanced HVAC system design.
Refrigerant Charge
Subcooling, superheat, and charge calculators for common refrigerant types with real-time reference tables.
Electrical
NEC-referenced electrical calculations for journeymen, masters, and apprentices.Wire Sizing & Voltage Drop
NEC-compliant wire sizing with voltage drop calculations for any circuit length and load.
Conduit Fill
Calculate conduit fill percentages per NEC Chapter 9. Supports all common conduit types and wire combinations.
Panel Scheduling
Balance loads across panel phases and calculate total connected and demand loads per NEC Article 220.
Plumbing
Pipe sizing, fixture unit, and drainage calculations for plumbing professionals.Pipe Sizing & Flow
Calculate pipe diameter, flow rate, and velocity for water supply, drainage, and gas piping systems.
Fixture Units
DFU and WSFU calculators per IPC/UPC for sizing drain, waste, vent, and water supply piping.
Grade & Slope
Compute drain slope, percent grade, and fall-per-foot for gravity drainage systems.
Pricing
Simple, honest pricing
Start free with essential calculators. Upgrade when you need the full suite.
Free
Essential calculators for every trade
- 10 core calculators
- Unit converter
- Offline mode
- Calculation history (last 50)
Pro
Full suite for serious professionals
- 50+ specialized calculators
- All 4 trade categories
- Unlimited calculation history
- PDF export & sharing
- Custom formula builder
- Job cost tracking
- Code reference tables
- Priority support
Team
For crews and companies
- Everything in Pro
- Team formula sharing
- Admin dashboard
- Bulk licensing
- Company branding
- Dedicated support
FAQs
Frequently Asked Questions
Got questions about CalcRig? We've got answers.
Does CalcRig work offline?
Yes — every calculator works 100% offline. We know job sites don't always have cell service. Your calculations are saved locally and sync to the cloud when you're back online.
Which building codes are referenced?
CalcRig references NEC (National Electrical Code), IRC (International Residential Code), IPC (International Plumbing Code), and IMC (International Mechanical Code). Code tables are updated with each code cycle.
Can I use it on both iOS and Android?
Absolutely. CalcRig is available on both the App Store and Google Play. Your account syncs across all your devices, so you can start a calculation on your phone and review it on your tablet.
Is there a free version?
Yes. The free tier includes 10 core calculators, unit conversions, and offline mode — no credit card required. Upgrade to Pro when you need the full suite of 50+ specialized calculators.
Can my whole crew use it?
Our Team plan offers per-user pricing with shared custom formulas, an admin dashboard, and bulk licensing. Perfect for contractors managing multiple crews.
How accurate are the calculations?
All calculators are verified against industry reference standards and code tables. We maintain 99.9% accuracy and our formulas are reviewed by licensed trade professionals in each discipline.
Start calculating
like a pro
Join thousands of trade professionals who trust CalcRig on every job site.Free to download. No credit card required.