28 Code-Compliant Trade Calculators
Built for electricians, HVAC technicians, and contractors. NEC 2023, ASHRAE, IRC & ACI references. Works 100% offline.
Three trades. 28 calculators. Every code referenced.
Results you can trust on the job site, offline, with no account required.
Electrical
- Ohm's Law Free
- Voltage Drop Free
- Wire Sizing Pro
- Conduit Fill Pro
- Load Calculator Pro
- Motor FLA Pro
- Transformer Sizing Pro
- Breaker & Fuse Sizing Pro
- Power Factor Correction Pro
HVAC
- BTU Heat Load Free
- CFM Airflow Free
- Duct Sizing Pro
- Equipment Sizing Pro
- Refrigerant Charge Pro
- Ventilation Rate Pro
- Psychrometric Pro
- Heat Exchanger Pro
- Cooling Tower Pro
Construction
- Concrete Volume Free
- Paint Coverage Free
- Lumber Framing Pro
- Drywall Estimator Pro
- Roof Pitch & Area Pro
- Gravel & Aggregate Pro
- Brick & Block Pro
- Rebar Spacing Pro
- Staircase Calculator Pro
- Tile Estimator Pro
Built for the field, not the office.
Every feature designed for tradespeople who need accurate answers on site, fast.
Code-Compliant
NEC 2023, ASHRAE 62.1, IRC 2021, ACI 318-19. Every calculator cites the applicable standard with edition year.
100% Offline
All calculations run locally on your device. No internet, no account, no data collection. Designed for the job site.
Job-Site Photos New
Attach up to 3 photos per calculation. Document panels, equipment, and site conditions alongside your results.
Batch Calculations New
Compare up to 20 scenarios side-by-side. Run the same calculator across different inputs and export the comparison.
PDF Reports
Generate branded reports with your company logo and license number. Share or print directly from the job site.
CSV Export New
Export project calculations or batch results to spreadsheet-ready CSV files for estimating and documentation.
Imperial & Metric
Toggle between unit systems on any result. All outputs convert automatically with one tap.
Calculation History New
Searchable log of every calculation you've run, filterable by trade and date. Your complete calculation trail.
Simple pricing. Start free.
6 calculators free forever. Upgrade to Pro for the full toolkit.
Free
- 6 calculators (2 per trade)
- 1 project
- Code references
- Offline access
Monthly
- All 28 calculators
- Unlimited projects
- PDF reports + CSV export
- Photos, batch calc, history
- 7-day free trial
Yearly
- Everything in Monthly
- Best value for professionals
- 7-day free trial
Subscriptions auto-renew. Cancel anytime in your Apple ID settings.
Common questions
A professional trade calculator app with 28 code-compliant calculators for electricians, HVAC technicians, and contractors. References NEC 2023, ASHRAE, IRC 2021, and ACI 318-19.
Yes. Every calculation runs locally on your device. No internet, no account, no data collection. Built for the job site.
6 calculators are free: Ohm's Law, Voltage Drop (Electrical), BTU Heat Load, CFM Airflow (HVAC), Concrete Volume, Paint Coverage (Construction). Pro unlocks all 28.
NEC 2023 for electrical, ASHRAE 62.1-2022 for HVAC ventilation, ACCA Manual J/S for HVAC loads, IRC 2021 for stairs, and ACI 318-19 for concrete/rebar.
Go to Settings > Apple ID > Subscriptions on your device. You can cancel anytime and retain access until the end of your billing period.