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Solar Panel CalculatorEstimate solar panel count from energy use, sun hours, panel wattage, and system losses.Score 90solarpanelcountSolar System Size CalculatorEstimate solar system size from monthly usage, sun hours, and system efficiency.Score 38solarSolar ROI CalculatorCalculate solar ROI from installation cost, yearly savings, incentives, and maintenance.Score 38solarRamadan Countdown CalculatorCalculate days remaining to a target Ramadan date from current day number.Score 38countSolar CO2 Saving CalculatorEstimate CO2 savings from solar generation and grid emission factor.Score 38solarDiscount CalculatorCalculate sale price and savings from a discount percentage.Score 30countHeadcount Growth CalculatorCalculate ending headcount and headcount growth rate from hires and exits.Score 30countSolar Payback CalculatorEstimate solar payback period from net system cost and yearly savings.Score 30solarPercentage 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 14countInverter CalculatorEstimate inverter size from continuous load, surge load, and safety factor.Score 14solarFuture 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 12count