PanaKit / Calculators
Free Online Calculators
155+ unique calculators organized into 9 categories — browse by topic or search below. Fast, accurate, and completely ad-free.
PanaKit's free online calculators cover everything from math and science to health, finance, electrical engineering, and lighting — all in one place. Each calculator delivers instant, accurate results with no downloads, no accounts, and no ads. Whether you need a Percentage Calculator, a BMI Calculator, or an Ohm's Law Calculator, you'll find it below.
Health & Fitness Calculators
Browse all Health & Fitness Calculators →Women's Health Calculators
Browse all Women's Health Calculators →Pregnancy Due Date CalculatorPeriod Tracker CalculatorFertility CalculatorBra Size CalculatorPregnancy Weight Gain CalculatorPregnancy Weight Gain by WeekWomen’s Body Fat CalculatorIdeal Weight Calculator for WomenCalorie Calculator for WomenWaist-to-Hip Ratio CalculatorMenopause Age CalculatorPeriod Blood Loss CalculatorDress Size ConverterOvulation CalculatorMenstrual Cycle CalculatorConception Date CalculatorGestational Age CalculatorImplantation CalculatorIVF Due Date CalculatorFertile Window CalculatorNext Period CalculatorUltrasound Due Date CalculatorMenstrual Phase CalculatorBreastfeeding Calorie CalculatorContraceptive Effectiveness Reference
Time Calculators
Browse all Time Calculators →Grade Calculators
Browse all Grade Calculators →Financial Calculators
Browse all Financial Calculators →Math Calculators
Browse all Math Calculators →Addition CalculatorSubtraction CalculatorMultiplication CalculatorDivision CalculatorPercentage CalculatorPercentage Change CalculatorPercentage Increase CalculatorPercent Error CalculatorAverage CalculatorWeighted Average CalculatorStandard Deviation CalculatorVariance CalculatorFractions CalculatorAdding Fractions CalculatorSubtracting Fractions CalculatorMultiplying Fractions CalculatorDividing Fractions CalculatorSimplifying Fractions CalculatorSquare Root CalculatorRoot CalculatorExponents CalculatorExponential Growth CalculatorFactorial CalculatorLog CalculatorLn CalculatorAntilog CalculatorSine CalculatorCosine CalculatorTangent CalculatorArcsin CalculatorArccos CalculatorArctan CalculatorTrigonometry CalculatorPythagorean Theorem CalculatorQuadratic Equation SolverRatio CalculatorGCF CalculatorLCM CalculatorRemainder CalculatorScientific Notation CalculatorHex CalculatorComplex Numbers CalculatorConvolution CalculatorRandom Number GeneratorOnline Math CalculatorSimple Math Calculator
Wire Calculators
Browse all Wire Calculators →Lighting Calculators
Browse all Lighting Calculators →Candela to Lumens CalculatorCandela to Lux CalculatorLumens to Candela CalculatorLumens to Lux CalculatorLumens to Watts CalculatorLumens to Millicandela CalculatorMillicandela to Lumens CalculatorLux to Candela CalculatorLux to Lumens CalculatorLux to Watts CalculatorLux to Footcandles CalculatorFootcandles to Lux CalculatorWatts to Lumens CalculatorWatts to Lux Calculator
Electrical Calculators
Browse all Electrical Calculators →Ohm's Law CalculatorPower CalculatorPower Factor CalculatorVoltage Divider CalculatorWatts to Amps CalculatorWatts to Volts CalculatorWatts to kWh CalculatorWatts to VA CalculatorWatts to kVA CalculatorWatts to Joules CalculatorAmps to Watts CalculatorAmps to Volts CalculatorAmps to kW CalculatorAmps to kVA CalculatorAmps to VA CalculatorVolts to Amps CalculatorVolts to Watts CalculatorVolts to kW CalculatorVolts to Joules CalculatorVolts to eV CalculatorkW to Amps CalculatorkW to Volts CalculatorkW to kWh CalculatorkW to VA CalculatorkW to kVA CalculatorkWh to kW CalculatorkWh to Watts CalculatorkVA to Amps CalculatorkVA to Watts CalculatorkVA to kW CalculatorkVA to VA CalculatorVA to Amps CalculatorVA to Watts CalculatorVA to kW CalculatorVA to kVA CalculatorJoules to Watts CalculatorJoules to Volts CalculatoreV to Volts CalculatorElectricity Bill CalculatorEnergy Consumption CalculatorEnergy Cost CalculatorWatts-Volts-Amps-Ohms Calculator