Age Calculator
Calculate exact age in years, months, days, and total days.
Daily Life
Daily-Life Calculators
Use practical calculators for time, health estimates, and daily decisions.
Practical tools for dates, health estimates, routines, budgets, and common daily conversions.
Tools in this category
Date Calculator
Find the difference between two dates in days.
Days Between Dates Calculator
Count days between any two dates with clear sign and absolute difference.
Business Days Calculator
Count weekdays between dates, excluding weekends.
Add/Subtract Days Calculator
Add or subtract day offsets from a base date.
Countdown Calculator
Measure remaining time from now to a selected future date and time.
Week Number Calculator
Find ISO week number for any date.
Time Duration Calculator
Calculate elapsed duration between two times.
Sleep Calculator
Estimate total sleep duration between bedtime and wake time.
Pregnancy Due Date Calculator
Estimate due date from last menstrual period and cycle length.
Ovulation Calculator
Estimate ovulation date and a likely fertile window.
BMI Calculator
Compute body mass index from weight and height.
BMR Calculator
Estimate resting daily calories using Mifflin-St Jeor equations.
Water Intake Calculator
Estimate daily hydration target based on weight and activity.
Calorie Calculator
Estimate maintenance calories from BMR and activity level.
Tip Calculator
Compute tip amount, total bill, and per-person share.
Split Bill Calculator
Split shared bills fairly with optional extra charge percentage.
Discount Calculator
Calculate discounted price and post-tax total.
Unit Converter
Convert between common length units using consistent factors.
Currency Converter
Convert amounts using static reference FX rates for planning.
Height Converter
Convert height values across metric and imperial units.
Weight Converter
Convert weight units including kg, g, lb, and oz.
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Category FAQ
How should I use the daily-life calculators tools?
Start with one calculator, review the assumptions shown on the page, then compare with related tools for scenario planning.
Are these tools free to use?
Yes. TeachMechanical Tools are free and designed for practical educational and planning use.
Can I use these tools on mobile?
Yes. The pages are built mobile-first with large fields, clear labels, and keyboard-friendly controls.