Electricity & Construction
Free electrical and construction calculators: Ohm's Law, voltage drop, resistor codes, BTU sizing, concrete, roofing, tile, and stair calculations.
Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law. Essential tool for electronics and electrical engineering.
Voltage Drop Calculator
Calculate voltage drop in electrical wires. Essential for ensuring proper wire gauge selection and NEC compliance.
Resistor Color Code Calculator
Decode resistor values from color bands or find the color code for a specific resistance value.
Electricity Cost Calculator
Calculate electricity consumption and costs for your appliances. Track power usage and estimate monthly bills.
BTU Calculator
Calculate heating and cooling requirements for your room. Find the right BTU capacity for air conditioners and heaters.
Concrete Calculator
Calculate concrete volume needed for slabs, columns, footings, and other shapes. Estimate bags and ready-mix yards required.
Square Footage Calculator
Calculate area in square feet for rooms, properties, and various shapes. Convert between different area units.
Roofing Calculator
Calculate roofing materials needed including shingles, underlayment, and accessories. Estimate costs for your roofing project.
Tile Calculator
Calculate tiles needed for floors and walls. Estimate grout, mortar, and total project cost.
Stair Calculator
Calculate stair dimensions including rise, run, and number of steps. Ensure code compliance for safe, comfortable stairs.
Electrical Calculations
Calculate voltage, current, resistance, and power with Ohm's Law. Determine voltage drop for proper wire sizing and decode resistor color codes for electronics projects.
Construction Materials
Calculate concrete volumes, roofing materials, tile quantities, and stair dimensions. Plan your construction projects with accurate material estimates.
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