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AC Tonnage CalculatorConvert cooling BTU load into AC tonnage.Score 22hvacHeat Load CalculatorEstimate heat load from area, heat gain factor, occupants, and equipment.Score 22hvacDuct Size CalculatorEstimate round duct diameter from airflow and target air velocity.Score 22hvacBTU CalculatorEstimate cooling BTU need from room area, height, occupants, and sunlight factor.Score 14hvacVentilation CalculatorCalculate ventilation airflow from room volume and air changes per hour.Score 14hvacMortgage 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 2PTO Accrual CalculatorCalculate accrued PTO hours, remaining PTO, and estimated payout value.Score 2Employee Turnover Rate CalculatorCalculate employee turnover rate from separations and average headcount.Score 2