Blog
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Driving costs 268,000 more a month but saves 240 hours a year. Is it worth it?
Compare monthly cost and commute time for driving versus transit, and work out the price of each hour you save, using a worked example.
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A two-hour daily commute costs you about 1.7 years over 30 years
Multiply your daily commute across a whole career. A one-hour and a two-hour round trip side by side, and how to read the result.
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When the jeonse loan rate rises from 4% to 6%, jeonse and monthly rent swap places
How to compare Korean jeonse and monthly rent once loan interest and opportunity cost are counted, with an example where a 2-point rate change flips the answer.
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A 10% raise that lowers your real hourly wage by 4%
How to compare a job offer by real hourly wage once commute and work hours are counted, with a worked example.
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How many more times will you see your parents? Monthly visits mean 240
How to count remaining visits from your parents' age and how often you meet, and how much the count changes when the frequency changes.
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At ₩1M a month, raising a child to college graduation costs ₩264M. How to calculate it and what it leaves out
Multiply a monthly per-child spend across the years to get a total, and see what this simple calculation misses.
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₩100,000 a gift, twelve times a year, comes to ₩72M over a lifetime
Calculate the lifetime total of wedding and funeral gift money in Korea from the average amount and yearly count, split into money already given and money ahead.
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A ₩4,500 daily habit adds up to ₩90 million by 85, or over ₩300 million invested
Multiply a daily habit like smoking or drinking across a lifetime, and compare it with investing the same money every month.
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Two walks a day with a five-year-old dog leaves about 7,300 walks
Count the days and walks left with your pet from its age and an assumed life expectancy, with reference values by species and size.
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A new phone costs 13 workdays on a ₩2.5M monthly salary
Work out your hourly wage from take-home pay and hours, then convert any price into the hours of work it takes, with worked examples.
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Before you pick a resignation date in Korea, check when you hit one year
How to calculate tenure and your one-year anniversary from a hire date, and why one year matters for severance pay and annual leave under Korean law.
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Five hours of phone a day until 85 adds up to 14 years and 7 months
Convert your daily smartphone time into a lifetime figure, compare three hours with five, and split time already spent from time ahead.
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At 33 you have about 2,600 weekends left, and only 1,400 before retirement
How to count the weekends you have left from your age and an assumed life expectancy, with a table by age and what changes when you split them at retirement.
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Saving ₩1.5M a month for a ₩700M home takes 23 years, or 40 if prices rise 2% a year
Count how long a target home price takes from monthly saving, and see how the price-growth assumption and the monthly amount change the answer.
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What seeing your life in weeks does to you
What changes when you split a life into a few thousand cells, and why that view is useful.
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Exporting your Google Timeline
How to get your location history as JSON from a phone or Google Takeout, which file you actually want, and where people get stuck.
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Compiling a residency history into timeline.json
A practical procedure for moving passport stamps, address records, and school enrolment into one JSON file.
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How to pick the life-expectancy number
What to put in the expectedAge value that sets the grid's cell count, somewhere between the statistics and your own odds.
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How much your location history reveals
What a few years of location data exposes, why "anonymized" rarely holds, and how this tool is built around that risk.