TradeTools: Trade Calculators

ZkDev

Contains adsIn-app purchases

About this app

Sixty-two field calculators for seven trades in one app, worked against the published codes and running entirely offline.

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, span tables
- Construction: concrete volume and fence layout

CODE REFERENCES BUILT IN
- NEC for electrical and solar work, cited to the article
- NFPA 13, 14, 20, 25, 72 and 10 for fire protection
- IPC for plumbing, IRC for framing and stairs
- Every result names the table or section it came from, with the edition, because standards renumber between cycles

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. Recently opened tools stay within reach.

CORE FEATURES
- Works offline, no signal needed on site
- US customary and metric units throughout
- Feet-and-inches entry: type 12' 6-1/2" or 12.5
- Calculation history you can reopen and reuse
- PDF export for submittals and field records
- English and Spanish
- Material Design 3 interface

WHAT IT COSTS
Fifteen calculations are included at no charge. After that, a short video restores the allowance, or the Pro upgrade removes the limit for good.

OPTIONAL PRO UPGRADE - $19.99 ONE-TIME IN-APP PURCHASE
A separate one-time purchase. It is not required to use the calculators:
- No calculation limit and no ads
- Unlimited saved history
- PDF export of results
- Dark theme

WHAT THE PDF REPORT INCLUDES
- Every input you entered
- The calculated results with units
- The code reference the result was worked against
- Date and time of the calculation

TYPICAL USES
- Sizing and checking on site before the work goes in
- Verifying a contractor submittal during plan review
- Pricing a job on a bid walk without the code book
- Backing a field 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.

tradetools.dev

What’s new

Wire Size: the ambient temperature correction is right again for temperatures that fell between two rows of the table — 51, 60, 69, 78, 87, 96, 105 and 114 °F picked up the wrong factor and over-rated the conductor. Every whole degree is now tested.