Sandglass
Free tools about time
Small calculators that run in your browser, with no sign-up and without sending your data.
Alongside the main Sandglass tool, which splits your remaining time between activities, we have created these complementary calculators. They all run in your browser and explain how each calculation is done.
Exact age calculator
Calculate your exact age in years, months, days, hours and seconds, your next birthday, the day of the week you were born and your upcoming life milestones.
Your life in weeks
Generate your life calendar in weeks: each square is one week. See how many you have lived and how many are left, and download or print it.
Sleep calculator
Work out what time to go to bed or wake up based on 90-minute sleep cycles so you wake up more rested.
Screen time calculator
Turn your daily hours of phone, social media or TV into days and years of life, and calculate how much time you would gain by cutting them down.