Electrical & Engineering Calculators
Technical engineering estimators for electrical circuits, voltage drop, wire ampacity ratings, and component color coding. Browse all 5 calculators below with automatic unit conversions.
Voltage Drop Calculator (NEC 3% & 5% Standards)
Calculate voltage drop across AC/DC single-phase circuits based on wire gauge, conductor material, and distance.
Ohm's Law & Power Calculator
Calculate voltage (V), current (I), resistance (R), and electric power (P) across DC and single-phase circuits.
Tire Size & Dimension Calculator
Convert metric tire specification (e.g., 265/75R16) into diameter, width, sidewall height, and speedometer revs per mile.
Wire Gauge Sizing Calculator (AWG)
Find the minimum recommended electrical wire gauge (AWG) based on amperage, circuit voltage, distance, and maximum allowable voltage drop.
Resistor Color Code Calculator (4-Band)
Decode 4-band electronic resistor color bands to resistance value and manufacturing tolerance range.