Writing calculators
Choose a focused calculator for writing planning, estimation, and decision-making.
22 calculators available
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Writing Percentage Calculator
Compute percentages, percent of, percent change, and percent add/subtract for writing planning.
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Writing Tip Calculator
Calculate tip amount, total bill, and amount per person when splitting a check.
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Writing Discount Calculator
Compute final price after a discount, with optional sales tax, plus total savings.
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Writing Markup Calculator
Compute markup amount and markup percentage from cost and selling price.
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Writing Margin Calculator
Compute gross profit and margin percentage from revenue and cost.
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Writing Ratio Calculator
Simplify a ratio to lowest terms and show the equivalent unit ratio.
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Writing Average Calculator
Compute the mean, sum, and count of a set of numbers.
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Writing Unit Converter
Convert length, weight, and volume between metric and imperial units.
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Writing Age Calculator
Compute exact age in years, months, and days from a date of birth.
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Writing Date Difference
Calculate the number of days, weeks, and calendar months between two dates.
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Writing Time Duration
Add hours and minutes, with carry-over into a total duration.
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Writing BMI Calculator
Compute body mass index from weight and height, with category interpretation.
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Writing BMR Calculator
Estimate basal metabolic rate using the Mifflin-St Jeor equation.
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Writing TDEE Calculator
Estimate total daily energy expenditure from BMR and activity level.
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Writing Body Fat Estimate
Estimate body fat percentage from BMI, age, and sex using a validated approximation.
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Writing Calories Burned
Estimate calories burned during physical activity using MET values.
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Writing Water Intake
Estimate recommended daily water intake from body weight and activity.
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Writing One Rep Max
Estimate one-repetition maximum strength from a submaximal set using the Epley formula.
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Writing Target Heart Rate
Compute target heart rate zones using the Karvonen method.
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Writing Macro Split
Convert a calorie target into grams of protein, carbs, and fat.
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Writing Ideal Weight
Estimate a healthy body weight range from height and sex (Devine method).
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Writing Typography Scale
Generate a modular typography scale (1.125, 1.25, 1.333, 1.5, 1.618).