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Pregnancy Due Date Calculator
Estimate a due date from the last menstrual period date.
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Calculators
Browse practical calculators and utilities by topic. Each tool is designed to solve a specific question, with clear inputs and readable results.
Calculator
Body Surface Area Calculator
Calculate an approximate body surface area with a commonly used formula.
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Inflation Calculator
Explore how a chosen inflation assumption changes the future cost equivalent of an amount.
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TDEE Calculator
Estimate total daily energy expenditure from an adult resting-energy formula and activity category.
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BMR Calculator
Estimate basal metabolic rate with a commonly used adult equation.
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BMI Calculator
Calculate body mass index as a general screening measure for adults.
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Invoice Late Fee Calculator
Estimate simple interest on an overdue invoice from rate and days.
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Sales Commission Calculator
Estimate commission pay from sales and a commission percentage.
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Break-Even Calculator
Find the unit sales level where contribution covers fixed costs.
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Freelance Rate Calculator
Estimate a baseline freelance hourly rate using income needs, business costs and billable capacity.
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