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Solar Panel CalculatorEstimate solar panel count from energy use, sun hours, panel wattage, and system losses.Score 52panelcountRamadan Countdown CalculatorCalculate days remaining to a target Ramadan date from current day number.Score 38countDiscount CalculatorCalculate sale price and savings from a discount percentage.Score 30countHeadcount Growth CalculatorCalculate ending headcount and headcount growth rate from hires and exits.Score 30countPercentage CalculatorCalculate percentages, percent change, discounts, increases, and reverse percentages.Score 24countKids Addition CalculatorPractice addition with visual counters, guided steps, Learn Mode, and friendly checking.Score 24countPresent Value CalculatorCalculate the present value of a future amount using discount rate and time.Score 22countKids Number Line CalculatorPractice addition jumps on a number line with visual movement and guided step explanations.Score 22countEmployee Turnover Rate CalculatorCalculate employee turnover rate from separations and average headcount.Score 16countAge CalculatorCalculate exact age in years, months, days, total days, and next birthday countdown.Score 14countPayroll Cost CalculatorEstimate fully loaded payroll cost including gross pay, employer taxes, benefits, and insurance.Score 14countFTE CalculatorCalculate full-time equivalent headcount from worked hours and standard full-time hours.Score 14countFuture Value CalculatorCalculate the future value of a present amount with interest, compounding, and time.Score 12countPermutation CalculatorCalculate permutations where order matters.Score 12countCombination CalculatorCalculate combinations where order does not matter.Score 12countFactorial CalculatorCalculate factorial, permutations, and combinations from integer inputs.Score 12countAvogadro's Number CalculatorConvert moles to particles using Avogadro's number.Score 12countElectrical Load CalculatorCalculate electrical load from voltage, current, power factor, and quantity.Score 12panelAdvanced Scientific CalculatorEvaluate trig, logarithmic, exponential, root, and power operations from one advanced panel.Score 6panelKids Division CalculatorUnderstand division as equal sharing with guided steps, visual counters, and answer checking.Score 6count