WattsWise is a professional Electrical Calculator built for engineers, electricians, and technical students.

STOP WORKING HARDER THAN YOUR TOOLS.
The architect changed the plans. Again.
A simple 10% load increase changes everything. Now you have to recalculate the Current, check the Voltage Drop, and verify the Power Factor correction.
Doing this manually means writing values on your hand and re-typing them into separate apps. It is slow, it is risky, and it takes 15 minutes. With WattsWise, it takes 30 seconds.
? THE "SMART ECOSYSTEM" DIFFERENCE
Most apps are isolated forms. WattsWise is a living system.
• Interconnected Core: Change the Active Power (kW) in the Power module, and watch the Current (Amps) update instantly in the Voltage Drop calculator.
• Reactive Logic: Adjust the Power Factor, and the Active Power (kW) and Reactive Power (kVAR) recalculate automatically across the core tools.
• Instant Updates: Toggle Efficiency, and the entire circuit logic adapts in real-time.
It acts as your digital Technical Notebook, keeping your Load Calculation consistent. No more re-typing values. No more continuity errors.
⚡ PROFESSIONAL MODULES
1. Voltage Drop Calculator (The K-Constant Method)
Don't settle for estimates. We use the K-Constant Method (Resistivity) to calculate Voltage Drop Percentage and absolute values with engineering precision.
• Capabilities: Supports Single Phase and Three Phase systems perfectly.
• Flexibility: Seamlessly toggle between AC and DC calculations.
• Smart Input: Pulls Amps directly from your Power settings or allows manual overrides.
2. Power Triangle Analysis
Master the relationship between Active Power, Reactive Power, and Apparent Power.
• Instant Conversions: Watts to Amps made effortless.
• Dynamic Solving: Edit any variable (V, I, PF, S) and the app solves the rest of the triangle instantly using complex algebra principles.
3. Short Circuit & Fault Current
Safety first. Perform quick Short Circuit estimations using the Point-to-Point method at the end of a run.
• Input: Enter Transformer Impedance (%Z) and source voltage.
• Output: Get the Fault Current at the load to help you estimate panel ratings.
4. Conductor & Conduit Tools
Essential utilities for the daily workflow:
• Wire Gauge Converter: Instant AWG to mm² conversion.
• Conduit Fill (Pipe Fill): Calculate fill percentage based on cable and conduit diameters. Avoid impossible pulls before you buy the material.
5. Advanced Diagnostics (Pro Tools)
• PF Correction: Calculate the exact Capacitor Bank size (kVAR) needed to improve efficiency and avoid utility penalties.
• Current Imbalance: Detect motor-damaging asymmetry. Includes a PRO mode using Symmetrical Components (Negative Sequence) for precise forensic analysis of the feeder.
• Insulation Resistance: Log your Megger Test results. The app calculates temperature-corrected resistance, DAR Index, and PI Index strictly following IEEE 43 guidelines.
? NORM-AGNOSTIC (Global Presets)
WattsWise works globally. Whether you are in the US, Europe, or South America, use our Global Presets to instantly configure system Voltage and Frequency (50Hz/60Hz).
• Philosophy: We calculate the Physics (the raw engineering truth), so you can ensure compliance with your local code (NEC, IEC, or NTC).
? BUILT FOR THE FIELD
• Offline Calculation: The only electrician app that works 100% without internet. Perfect for remote sites.
• Save Projects (Pro): Export your data to JSON files. Act as a Project Manager by saving "Building A" configurations and restoring them months later.
• Ad Free: Distraction-free option available.
Whether you are an Electrical Contractor commissioning a panel or an Engineering Student analyzing complex AC circuits, or an engineer estimating an Electricity Bill with our Energy Cost module, WattsWise is the fastest Field Tool in your pocket.
Designed by Engineers, for Engineers.
Download WattsWise today and turn the next plan-change headache into a 30-second tap.