• Alcohol Units Calculator (UK)
    Calculate UK alcohol units from drink volume and ABV. Free units calculator for beer, wine and spirits using the official NHS formula.
  • Time to Sober Up Calculator
    Estimate how many hours it takes for your blood alcohol concentration (BAC) to return to 0.00% using the average elimination rate of 0.015% per hour.
  • Addiction Cost Calculator
    Calculate how much an addiction has cost you and how much you could save in a year by quitting. Free recovery savings calculator.
  • Pomodoro Technique Calculator
    Calculate the total time for your Pomodoro study or work plan, including work sessions, short breaks, and long breaks after every 4th cycle.
  • Standing Desk Height Calculator
    Find your ideal standing desk and monitor height from your body height. Get ergonomic elbow-level desk and eye-level monitor positions in cm or inches.
  • Hair Growth Calculator
    Estimate how long it takes to grow your hair to a target length based on your current length and monthly growth rate (~1.25 cm/month average).
  • Social Media Time Alternatives Calculator
    See how many hours and days you could reclaim each week, month and year by cutting back on social media — plus the dollar value of that time.
  • Sleep Debt Calculator
    Calculate your accumulated sleep debt over any period by comparing ideal sleep to your actual sleep each night. Free, fast, and easy to use.
  • 90 Minute Sleep Cycle Calculator
    Find the best time to wake up using 90-minute sleep cycles. Enter your bedtime and get wake times for 4, 5 and 6 full cycles to feel refreshed.
  • Sleep Debt Calculator
    Calculate your accumulated sleep debt over any period. Enter recommended hours, actual hours, and number of days to see your total sleep deficit.