Panel Planner vs HVAC Calculator

Plan, visualize, and manage your home's electrical system — right from your iPhone. Circuit Breaker Panel is an interactive residential electrical panel simulator that lets you map out every circuit in your home, track real-time current loads, and plan new circuits before you ever call an electrician. BUILD YOUR PANEL Install single-pole (120V) and double-pole (240V) breakers in any configuration. Choose from 15A, 20A, 30A, 40A, 50A, and 60A ratings. Support for 24, 30, and 40-slot panels with 100A, 150A, 200A, and 400A main breakers. ADD YOUR DEVICES Populate each circuit with the real appliances and devices in your home. Choose from 20 common presets — refrigerator, HVAC, EV charger, dryer, and more — or enter any custom wattage. Toggle devices on and off to simulate real-world usage scenarios. LIVE LOAD CALCULATIONS Current draw is calculated automatically for every circuit (Amps = Watts ÷ Voltage). Watch each breaker's load bar update in real time as you switch devices on and off. COLOR-CODED SAFETY STATUS Know at a glance which circuits are safe and which are at risk: Green glow — circuit is within safe range (under 70% load) Yellow glow — load is climbing, approaching capacity (70–90%) Red pulsing glow — circuit is overloaded, breaker would trip (over 90%) SAVE UP TO 10 PANELS Save and restore up to 10 complete panel configurations. Perfect for planning a renovation, comparing layouts, or managing panels across multiple properties. DESIGNED FOR CLARITY A realistic panel enclosure with a center bus bar, physical breaker switches, and load bars on every circuit give you an intuitive feel for your home's electrical system — no electrical engineering degree required. FULLY OFFLINE & PRIVATE No account. No internet connection. No data collection of any kind. Your panel configurations are stored only on your device.

Size any system in seconds. HVAC Calculator gives technicians, installers, and DIY homeowners fast, accurate BTU and load numbers — no spreadsheets, no guesswork. WHAT YOU CAN CALCULATE • BTU & Cooling Load — find the right AC size for any room by square footage, climate, and sun exposure • Ductulator — duct sizing by friction rate, velocity, and CFM • Tonnage Converter — instant BTU ⇄ ton conversions • Room & Area — square footage and volume in metric or imperial BUILT FOR THE FIELD • Works offline — no signal needed on the job site • Metric and imperial units • Clean, fast interface designed for gloved hands • Save and share your results • Formulas based on current HVAC industry standards TRUSTED BY HVAC PROS From apprentices studying for the EPA 608 to seasoned installers, HVAC Calculator replaces bulky charts and slide rules with one tool in your pocket. Download HVAC Calculator free and size your next job right the first time.