Wire & Load vs BaseCalc HVAC Calculator

Stop guessing the right wire size. Wire & Load is the no-internet-needed reference every electrician and maintenance tech wants in their pocket. GET AN INSTANT RECOMMENDATION for AWG / mm² wire size, voltage drop percentage, and the matching standard circuit breaker — driven by NEC 2023 / 75°C ampacity tables and the 240.6(A) breaker series. WHAT'S INSIDE • Voltage-drop calculator — single- and three-phase, copper or aluminum • Configurable voltage-drop limit (0.5% – 10%) • NEC 240.4(B) next-size-up breaker rule applied automatically • 60°C limits for 14/12/10 AWG copper and 12/10 AWG aluminum pre-applied per NEC 240.4(D) • Continuous-load (≥ 3 hr) 1.25× multiplier toggle • Power-mode input — enter watts and power factor, the app derives the working current OFFLINE REFERENCE TABLES • AWG ↔ mm² ↔ diameter (ASTM B258) • Copper and aluminum ampacity (NEC 310.16, 75°C) • Standard breaker sizes (NEC 240.6(A)) • Motor starting inrush multipliers — DOL, star-delta, soft starter, VFD (NEMA MG-1) DESIGNED FOR THE FIELD • Works on any job site, no signal needed • Search built into every reference table • Both AWG and mm² always shown on results • Switch between metric (mm² / m) and imperial (AWG / ft) • Localized in English, Spanish, Japanese, French, German, and Portuguese PRIVACY FIRST No accounts. No analytics. No ads. No tracking. Your inputs never leave your device. PRICING Try Wire & Load free for 7 days. After that, unlock lifetime access for a single $1.99 purchase — no subscription, no recurring charges, free updates. DISCLAIMER This app provides general reference information based on commonly-used electrical engineering tables and formulas. Results are estimates and do not constitute professional engineering advice. Always follow the electrical code applicable in your jurisdiction and consult a licensed electrician or engineer.

BaseCalc HVAC Calculator is an HVAC calculator for field math, worksheets, materials, and saved calculation history. Run BTU, CFM, duct sizing, airflow, psychrometrics, manufacturer-data refrigerant checks, planning load, hydronics, and other HVAC calculator arithmetic on site, then save the result for the job. 18 CALCULATORS FOR DAILY FIELD WORK • BTU ↔ Tons — convert between BTU/hr and refrigeration tons. • CFM from BTU — airflow from load and temperature rise/drop. • BTU from CFM — load from airflow and temperature difference. • Duct Sizing — round and rectangular duct from CFM and velocity. • Air Velocity — velocity from CFM and cross-sectional area. • Psychrometrics — total, sensible, and latent BTU/hr estimates at standard atmospheric pressure. • Refrigerant Lines — check entered manufacturer line data against an entered equivalent-length limit. • Superheat / Subcooling — record the exact target supplied by the equipment manufacturer. • Room Load — preliminary area-factor planning math using your supplied factor; not Manual J. • Heat Pump Balance — interpolate a bracketed balance point from entered manufacturer capacity data. • Hydronics — BTU, GPM, and ΔT relationships. • Mixed Air — mixed-air temperature from outdoor and return air. • Air Changes — ACH from CFM and room volume. • Evaporative Cooling — supply temperature and sensible air-side estimate. • Filter Velocity — filter face velocity; use manufacturer data for pressure drop. • O₂ Excess Air — theoretical dry-flue-gas dilution estimate from measured O₂; not a safety result. • Refrigerant Weight — additional charge from an entered manufacturer allowance and rate. • Outdoor Airflow — breathing-zone airflow arithmetic from user-supplied per-person and per-area rates. EVERY RESULT IS EXPLAINED • Explicit input validation, assumptions, and calculation boundaries. • Final arithmetic and a calculation breakdown where the supplied data supports one. • Saved local history so you keep a job-site record. BaseCalc HVAC is a professional reference tool. Always verify against current industry standards, manufacturer data, and local codes. The authority having jurisdiction has the final say. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/