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Perimeter CalculatorCalculate perimeter or circumference for rectangles, triangles, and circles.Score 30perimeterKids Geometry Area CalculatorLearn rectangle area and perimeter with a live shape preview, highlighted dimensions, and steps.Score 24perimeterTriangle CalculatorCalculate triangle area, perimeter, and semi-perimeter from side lengths.Score 14perimeterRectangle CalculatorCalculate rectangle area, perimeter, and diagonal.Score 14perimeterSquare CalculatorCalculate square area, perimeter, and diagonal.Score 14perimeterRoom Area CalculatorCalculate room floor area, perimeter, and wall area.Score 14perimeterWall Area CalculatorCalculate net wall area after doors and windows.Score 4perimeterMortgage 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 2Annual Salary to Hourly CalculatorConvert annual salary into hourly, weekly, biweekly, monthly, and daily pay estimates.Score 2Overtime Pay CalculatorCalculate regular pay, overtime pay, gross pay, and overtime share for a pay period.Score 2Payroll Cost CalculatorEstimate fully loaded payroll cost including gross pay, employer taxes, benefits, and insurance.Score 2