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Solar Panel CalculatorEstimate solar panel count from energy use, sun hours, panel wattage, and system losses.Score 38solarSolar 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 38solarSolar CO2 Saving CalculatorEstimate CO2 savings from solar generation and grid emission factor.Score 38solarSolar Payback CalculatorEstimate solar payback period from net system cost and yearly savings.Score 30solarInverter CalculatorEstimate inverter size from continuous load, surge load, and safety factor.Score 14solarAppliance Energy CalculatorCalculate appliance energy use and cost from wattage, hours, days, and rate.Score 4solarkWh CalculatorCalculate kilowatt-hours from watts and runtime.Score 4solarGenerator Fuel CalculatorEstimate generator fuel use and cost from load, runtime, and fuel rate.Score 4solarElectricity Bill CalculatorEstimate electricity bill with usage tiers, fixed fees, and tax.Score 4solarMortgage CalculatorEstimate monthly mortgage payments, total interest, principal, and payoff cost.Score 2BMI CalculatorCalculate body mass index using metric or imperial units and view the standard BMI category.Score 2Compound Interest CalculatorProject future investment value with compounding frequency and recurring contributions.Score 2Fuel Cost CalculatorEstimate advanced trip fuel cost with distance modes, efficiency units, fuel price units, emissions, commute projections, and vehicle comparisons.Score 2Scientific CalculatorUse a keyboard-friendly scientific calculator with trig, logs, powers, constants, and memory.Score 2Percentage CalculatorCalculate percentages, percent change, discounts, increases, and reverse percentages.Score 2Loan CalculatorEstimate loan payments, total interest, payoff totals, and amortized monthly costs.Score 2Force CalculatorCalculate force, mass, or acceleration using Newton's second law.Score 2Ohm's Law CalculatorCalculate voltage, current, resistance, and power from Ohm's law relationships.Score 2Age CalculatorCalculate exact age in years, months, days, total days, and next birthday countdown.Score 2