//Directory
Calculator categories
Seven practical subject areas. Counts and links reflect published calculators only; tools in review remain outside this directory.
Electrical Power CalculatorCapacitor Charge CalculatorInductor Energy CalculatorElectricity Cost CalculatorSeries Resistors CalculatorParallel Resistor CalculatorBattery Runtime CalculatorOhm's Law CalculatorVoltage Divider CalculatorLED Series Resistor CalculatorCapacitor Energy CalculatorBattery Capacity CalculatorTransformer CalculatorPCB Trace Resistance CalculatorMotor Current Calculator
Construction
Materials, areas and volumes.
2 published
Manufacturing
Machining, tolerances and process.
6 published
Math
Everyday and applied mathematics.
21 published
Fraction Subtraction CalculatorFraction SimplifierSignificant Figures CalculatorRounding CalculatorFraction CalculatorPercentage CalculatorLCM CalculatorGCF CalculatorModulo CalculatorPrime Factorization CalculatorHex CalculatorOctal CalculatorPrime Number CheckerFactors of a Number CalculatorDivisors CalculatorBase ConverterRoman Numeral ConverterScientific Notation CalculatorPercentage Change CalculatorCombination Calculator (nCr)Permutation Calculator (nPr)
Time & Date
Durations, ages and scheduling.
2 published
Everyday
Practical day-to-day tools.
3 published
Health & Fitness
Body metrics, energy and training (non-clinical).
7 published
Converters
Units, measures and conversions.
9 published