Voltage Drop Calculator
Calculate AC/DC circuit voltage drop percentage and end-of-line voltage according to NEC standards.
Wire Size Calculator
Determine recommended American Wire Gauge (AWG) based on ampacity and maximum 3% voltage drop.
Power Consumption Calculator
Calculate energy usage in kWh and total operating electricity costs over daily, monthly, and annual cycles.
Battery Runtime Calculator
Estimate battery backup duration under load factoring in battery chemistry, discharge depth (DoD), and inverter loss.
Solar Panel Output Calculator
Estimate daily and monthly solar photovoltaic kilowatt-hour (kWh) generation based on peak sun hours.
Transformer Sizing Calculator
Calculate required kVA rating for single-phase and three-phase electrical transformers.
Motor Power Calculator
Convert mechanical torque and RPM into electric motor horsepower (HP) and kilowatts (kW).
Torque Calculator
Calculate rotational torque from applied force and lever moment arm distance, or from motor power and RPM.
Pipe Pressure Drop Calculator
Estimate fluid pressure drop in smooth pipes using the Darcy-Weisbach / Hazen-Williams equations.
Electrical Cost Calculator
Calculate the true recurring operating cost of industrial or residential electrical machinery.
EV Charging Cost & Gas Savings Calculator
Calculate Electric Vehicle (EV) charging costs per mile, full battery charge price, and annual fuel savings compared to gasoline.
Electricity Bill & Appliance Power Calculator
Calculate electricity running cost, daily/monthly kWh power consumption, and utility bill impact for any home or workshop appliance.
Water Tank Capacity & Volume Calculator
Calculate water storage capacity, total gallons/liters, and water weight for cylindrical, rectangular, and spherical tanks.
Internet Speed & Download Time Calculator
Calculate how long it takes to download or upload games, 4K videos, backups, and large files based on internet bandwidth.
Room AC BTU & Heat Pump Sizing Calculator
Calculate required cooling BTU capacity and air conditioner tonnage based on room dimensions, ceiling height, and sun exposure.
Solar Panel ROI & Payback Period Calculator
Calculate the break-even years, 25-year electricity bill savings, and Return on Investment (ROI) of a residential or commercial rooftop solar system.
Multi-Mode Percentage Calculator
Solve percentage problems: calculate what is X% of Y, find what percentage X is of Y, or determine percentage increase and decrease.
Fraction Arithmetic & Simplifier Calculator
Add, subtract, multiply, and divide fractions. Convert between improper fractions, mixed numbers, and simplified lowest terms.
Chronological Age & Date Difference Calculator
Calculate exact chronological age in years, months, and days, total days lived, hours, minutes, and countdown to next milestone birthday.
Solar Roof Array & Battery Storage Output Calculator
Calculate total photovoltaic roof solar capacity (kW), annual kWh production, battery storage autonomy hours, and grid energy offset.
College & High School GPA Calculator
Calculate semester and cumulative Grade Point Average (GPA) on a 4.0 scale with course credit weighting and target GPA forecasting.
Universal Multi-Unit Engineering Converter
Instantly convert between Imperial, US Customary, and Metric SI units across Length, Mass, Temperature, Pressure, and Speed.