How-To Guides
Step-by-step guides that teach you how to perform calculations manually.
Car Lease vs Buy Calculator: A Step-by-Step Guide
Compare car leasing and buying costs over 3-5 years
Read guideRent vs Buy Calculator: A Step-by-Step Guide
Compare renting vs buying a home
Read guideHow to Calculate Meeting Cost: Step-by-Step Guide
Calculate meeting cost manually
Read guideHow to Calculate Screen Size: Step-by-Step Guide
Calculate monitor or TV screen dimensions manually
Read guideHow to Convert Recipe Units: Step-by-Step Guide
Convert recipe measurements with ease
Read guideHow to Calculate Reading Speed: Step-by-Step Guide
Calculate reading time manually
Read guideHow to Calculate Blood Alcohol Concentration (BAC): Step-by-Step Guide
Estimate BAC manually
Read guideHow to Calculate Your Commute Cost: Step-by-Step Guide
Manually calculate your annual commute cost in money, time, and CO₂ emissions. Understand the formulas and apply them to your daily travel.
Read guideHow to Calculate Days Until a Future Date: Step-by-Step Guide
Learn to manually calculate the number of days, weeks, and months until any future date, including handling leap years and determining the target weekday.
Read guideHow to Calculate Your Next Menstrual Periods: Step-by-Step Guide
Learn to manually predict your next 6 menstrual periods using your last period start date and average cycle length. Understand the formula and avoid common errors.
Read guideHow to Calculate Lean Body Mass: Step-by-Step Guide
Learn to manually calculate Lean Body Mass (LBM) with our step-by-step guide. Understand the formula, worked examples, and common pitfalls.
Read guideHow to Manually Calculate Animal Gestation Period and Due Date: A Step-by-Step Guide
Learn to manually calculate animal gestation periods and expected due dates. Understand the formula, worked examples, common pitfalls, and when to use a calculator.
Read guideHow to Calculate Running Pace, Time, or Distance: Step-by-Step Guide
Learn to manually calculate running pace, finish time, or distance with step-by-step instructions, formulas, and real-world examples. Understand the math behind your runs.
Read guideHow to Calculate Calories Burned During Exercise: Step-by-Step Guide
Learn to manually calculate calories burned during exercise using MET values. Step-by-step guide with formula, examples, and common pitfalls. Understand your energy expenditure.
Read guideHow to Calculate Your Conception Date: Step-by-Step Guide
Learn to manually calculate your conception date from your last menstrual period (LMP) or estimated due date (EDD) with formulas and examples.
Read guideHow to Calculate Your Pregnancy Due Date and Track Progress: Step-by-Step Guide
Learn to manually calculate your pregnancy due date, current week, and trimesters using clinical formulas like Naegele's Rule. Understand the process.
Read guideHow to Calculate Your Target Heart Rate: Step-by-Step Guide
Learn to manually calculate your Target Heart Rate (THR) for exercise using the Karvonen formula. Understand MHR, RHR, HRR, and training zones for effective workouts.
Read guideHow to Calculate Ideal Weight: A Step-by-Step Guide Using Medical Formulas
Calculate your ideal weight manually using the Devine, Robinson, Miller, and Hamwi formulas. Understand the steps, formulas, and common pitfalls.
Read guideHow to Calculate Daily Protein Intake: Step-by-Step Guide
Learn to manually calculate your daily protein needs based on weight, activity level, and fitness goals. Understand the formula and see a worked example.
Read guideHow to Calculate Basal Metabolic Rate (BMR): Step-by-Step Guide
Learn to manually calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation. Understand daily calorie needs and avoid common pitfalls.
Read guideHow to Calculate Body Fat Percentage: Step-by-Step Guide
Calculate body fat percentage manually using the US Navy method. Learn the formulas, take accurate measurements, and interpret your results with a step-by-step guide.
Read guideHow to Calculate BMI for Women: Step-by-Step Guide
Calculate BMI manually for women
Read guideHow to Calculate BMI: Step-by-Step Guide
Calculate BMI manually
Read guideHow to Calculate Your Training Zone: A Step-by-Step Guide
Calculate your training zone manually
Read guideSunrise Time Calculator: Step-by-Step Guide
Calculate sunrise time manually
Read guideHow to Calculate Time in Decimal Hours: A Step-by-Step Guide
Convert time to decimal hours for payroll and timekeeping
Read guideTime Zone Offset Calculator: A Step-by-Step Guide
Calculate UTC offset manually
Read guideHow to Calculate Sunset Time: Step-by-Step Guide
Calculate sunset time manually
Read guideSolar Noon Calculator: Step-by-Step Guide
Calculate solar noon manually
Read guideHow to Calculate Days to Retirement: Step-by-Step Guide
Calculate days to retirement manually
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