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Span Check: rafters only. Floor and ceiling joists, headers and beams are withdrawn; the joist data did not pass a check against IRC 2021. Box Fill: isolated grounding conductors count with the others. Standard breaker sizes start at 10 A (A/C keeps 15 A). Saved calculations in both can read differently. Concrete, Footing: Width is entered in feet; the field was labelled inches. NEC 690 Reference: NEC 2023 or 2026, tables replaced by guides.
62 calculators: HVAC, electrical, plumbing, fire, solar, carpentry + estimates.
Sixty-two field calculators for seven trades in one app, worked against the published codes and running offline. ESTIMATES AND REPORTS - Add to estimate puts a result on a quote; calculators like Wire Size write the line, you price it - Three steps to a price: who it's for, what's on it, and the total, with tax and a price reduction - Export PDF or Share sends your logo, the items and the total to the client; switch views for cost and margin, hidden from them - Estimates print in English, Spanish or Portuguese, independent of app language - Mark each estimate Accepted or Declined (Share sets Sent), and duplicate it for the next similar job - A technical report bundles saved calculations into one PDF for an inspector or customer, Pro WHAT IS INSIDE - HVAC: superheat and subcooling, P-T charts, refrigerant charge, heat load, duct and pipe sizing, airflow, psychrometrics - Electrical: wire size, voltage drop, conduit fill, box fill, dwelling and service load, breaker and conductor, motor circuits, transformers, grounding - Plumbing: water and drainage pipe sizing, fixture units, trap and vent, gas pipe, head loss, slope, septic, water heater, backflow - Fire protection: sprinkler hydraulics, hazard classification, pipe schedules, hanger spacing, standpipes, fire pumps, alarms, extinguishers, water supply - Solar: string sizing, inverter matching, wire and voltage drop, batteries, ground mount layout, production and payback, NEC 690 reference - Carpentry: rafters, stairs, framing, decks, roof area, lumber, drywall, trim, miter and bevel angles, rafter spans - Construction: concrete volume and fence layout CODE REFERENCES BUILT IN - NEC for electrical and solar, cited to the article - NFPA 13, 14, 20, 25, 72 and 10 for fire protection - IPC for plumbing, IRC for framing and stairs - Most code-based results cite the table or section HOW IT WORKS Pick your trade at first launch and the app opens on it. Every other trade is one tap away, and search reaches all sixty-two calculators by name, keyword or code reference. CORE FEATURES - Works offline - US customary and metric units - Feet-and-inches entry: type 12' 6-1/2" or 12.5 - English, Spanish and Portuguese (Brazil) WHAT IT COSTS Fifteen calculations are included at no charge. After that, a short video adds five more, or the Pro upgrade removes the limit for good. The same goes for estimates: one estimate is included, a short video adds one more, and Pro removes the limit there too. One client and one price item are included too, with the same video-or-Pro rule. OPTIONAL PRO UPGRADE - $19.99 ONE-TIME IN-APP PURCHASE A separate one-time purchase, not a subscription. It is not required to use the calculators: - No calculation limit and no ads - Save and reopen calculation history - Export results to PDF, or share them - Dark theme WHAT THE PDF REPORT INCLUDES - Every input entered - The calculated results with units - The code reference the result was worked against - Date and time TYPICAL USES - Sizing and checking before the work goes in - Checking a home's existing service for room to add an EV charger (NEC 2023 220.83) - Verifying a contractor submittal during plan review - Pricing a job on a bid walk - Backing a decision with a PDF for the job file - Studying for a licence or certification exam WHO IT IS FOR - Technicians, electricians, plumbers, fitters, installers and carpenters - Engineers, designers and estimators - Inspectors and plan reviewers - Contractors preparing bids and submittals - Apprentices and trade school students ACCURACY NOTE Results are a design aid, not a stamped design. Verify against the edition of the code adopted in your jurisdiction and confirm with the authority having jurisdiction. NEC, NFPA, IPC and IRC belong to their respective owners. TradeTools is independent, is not affiliated with or endorsed by them, and does not reproduce their codes. tradetools.dev