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Perimeter CalculatorCalculate perimeter or circumference for rectangles, triangles, and circles.Score 66perimeterregularpolygonKids 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 14perimeterOvertime Pay CalculatorCalculate regular pay, overtime pay, gross pay, and overtime share for a pay period.Score 6regularWall Area CalculatorCalculate net wall area after doors and windows.Score 4perimeterOvertime CalculatorCalculate overtime hours and pay from total hours, regular threshold, rate, and multiplier.Score 4regularMortgage 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 2Trip Budget CalculatorEstimate travel costs for transport, accommodation, food, activities, and business expenses, then see total trip cost, cost per person, cost per day, budget health, and savings guidance.Score 2