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BeHabitual

Everyday maths

Habit cost calculator

Minutes a day look cheap. Hours a year are the number that decides whether the habit fits.

By Nabeel Mustafa. Updated .

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15 min

What you actually spend, including setup

6

Days you keep it, not days in a week

52

52 is a year with no gaps. Subtract holidays you can name.

A year of this habit

78 hours

Minutes times days times weeks, divided by 60

Hours per week
1.5
Minutes per year
4680
8-hour work days
9.8

Same hours, a unit most people already feel

Weeks counted
52

If the yearly hours surprise you, cut the minutes before you cut the days. A shorter session you will keep is cheaper than a long one you will skip.

A calculator answers once. If you want this number to move over months, that needs a record: a free habit tracker that shows the whole month on one screen.

Track it as a habit

Why minutes a day is a bad unit

Fifteen minutes does not sound like much. Multiply it by six days a week and 52 weeks and you have 78 hours, which is almost two full-time work weeks. That is the number that should decide whether the habit makes the grid, not how it feels on a Tuesday morning.

Most people add a habit because the daily version is short. They quit it because the yearly version collided with something else they already do. Running the multiplication first is cheaper than finding that out in March.

What this page will not do

It cannot tell you whether the habit is worth the hours. A 20-minute walk and a 20-minute commute cost the same time and are not the same thing. The number is only a cost. You still have to decide if you are buying something.

It also believes the minutes you type. Ten minutes of stretching that is really four will look like a hobby. Forty-five minutes of writing that is really seventy will look cheaper than it is. Pad the figure the way you actually spend it, not the way you wish you did.

How to use the yearly hours

If the yearly figure surprises you, cut the minutes before you cut the days. A 20-minute version you will do is worth more than a 45-minute version you will skip, and the hours drop in a straight line when you shorten the session.

So do not treat 52 weeks as a law. Subtract the weeks you already know you will miss: Christmas, a two-week trip, the month after a baby. The honest number is the one you will actually spend, not the one that assumes a perfect year.

Work out the yearly cost

  1. Type the minutes you actually spend

    Use last week's real sessions, not the plan. Include setup and packing-up if those are part of doing it.

  2. Set the days you keep it

    Five weekdays is not the same as seven. A weekend-only habit is two, not 'most days'.

  3. Trim the weeks if you already know the gaps

    52 assumes you never skip a week. Take off holidays you can name.

  4. Read hours a year, then the work-day equivalent

    Eight-hour days are a useful comparison because most people already know what a work week feels like.

Questions people ask

How do I calculate how much time a habit takes?

Multiply minutes per session by days per week by weeks you will actually do it, then divide by 60. Fifteen minutes, six days, 52 weeks is 78 hours.

Should I count weekends?

Only if you do the habit on weekends. Type the days you keep, not the days in a week. A weekday-only habit is five.

What if I skip weeks?

Lower the weeks field. The default of 52 is a full year with no gaps, which almost nobody has.

Is a high yearly cost a reason to skip the habit?

It is a reason to look at the minutes. Shorten the session first. Dropping the habit because the honest number is large is fair too, and cheaper than adding it and abandoning it in March.

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