What is the ROI of taking a shower?

I recently measured how much soap I use in the shower.

4.32 grams.

Nobody asked me to do this. Nobody offered compensation. My family continues to support me despite mounting evidence that I require a hobby with fewer spreadsheets.

But if I’m going to investigate the ROI of everyday life, I should start with something I actually do.

My shower takes 17 minutes, followed by six minutes of drying off and getting ready.

Twenty-three minutes. Almost every day. Surely there’s a business case in there somewhere.

What am I buying?

My shower does several jobs.

It gets me clean. It helps me feel ready to face people. It feels good. And it gives me uninterrupted time to think—something the rest of my household does not currently offer as a standard service.

Those benefits matter. But first, we need the expenses.

The soap is financially innocent

Here’s the breakdown from my spreadsheet:

*Figures are rounded individually; the total uses the spreadsheet’s underlying values. Towel laundry and bathroom equipment are outside this calculation.*

My showerhead delivers 1.75 gallons per minute, so a 17-minute shower uses 29.75 gallons.

That means I’m using almost thirty gallons of water to prepare myself to sit at a computer.

The soap and shampoo together cost about five cents. They have been cleared of financial wrongdoing.

Water and heating account for almost the entire cash expense. Even so, $1.57 per shower sounds reasonable.

At one shower a day, that’s $573.05 a year.

Then I added my time.

How much is a free hour worth?

My first approach was to divide a $250,000 annual salary by 2,000 working hours.

That produced $125 an hour, which made showering look like a poorly managed corporate retreat.

But there’s a problem: I can’t necessarily sell an extra hour of my morning to my employer.

For this version, I’m using $33 an hour as my personal time valuation.

There’s a real decision behind that number: I pay someone $50 to mow my lawn, a job that would take me about an hour and a half.

That works out to roughly $33 an hour to avoid mowing. It includes avoiding the effort and inconvenience, so it isn’t a perfect valuation of every free hour. But it’s a useful benchmark grounded in something I actually pay for.

At $33 an hour, my 23-minute shower routine costs:

23 ÷ 60 × $33 = $12.65 in time.

Add the $1.57 cash expense:

Total economic cost: $14.22 per shower.

I entered the bathroom thinking I was spending some pocket change.

Apparently, I booked a service.

At one shower a day, that’s $5,190.30 a year, including almost 140 hours of my time.

Most of that is time value, of course. My bank account does not lose fourteen dollars every time I reach for a towel.

But those minutes are still being spent.

What is confidence worth?

Before a presentation, would I pay $3 to feel clean, comfortable, and ready instead of distracted by whether I should have showered?

Yes. For this example, that feels reasonable.

That doesn’t mean showering generates three dollars in income. It means I would willingly pay three dollars for that improvement in how I feel.

On a day spent alone at home, I might assign much less.

The shower doesn’t change. The circumstances do.

I’ll also assign $2 to the enjoyment and quiet of the experience itself.

I’m keeping those benefits separate: confidence is how I feel facing people afterward; enjoyment is how I feel standing under the water.

Otherwise, I could call the same pleasant sensation “wellness,” “readiness,” and “personal transformation,” then count it three times.

That would make an excellent pitch deck and a questionable spreadsheet.

What about the shower idea?

The shower is also where I sometimes think of something useful.

A solution to a work problem. A business idea. The perfect response to a conversation that ended two days ago.

Only some of these have economic potential.

A simple way to value that thinking is:

Chance of an additional useful idea × personal value of that idea.

“Additional” matters. If I would have had the same idea during a walk, the shower cannot claim exclusive ownership.

And the value should reflect what I might actually gain after the effort, expense, and uncertainty of using the idea. Imagining a successful business is considerably easier than operating one.

For now, I’ll leave ideas at zero in the base case and calculate what they would need to contribute.

The shampoo bottle has been notified that future funding depends on results.

Does my shower pay off?

Here’s the business case using my illustrative benefit values:

That’s approximately −65% personal ROI, calculated as benefits minus costs, divided by costs.

These are subjective benefits measured against estimated costs. This percentage is a way to examine my assumptions, not an investment return I can put in a retirement account.

With $5 assigned to confidence and enjoyment, I need another $9.22 in benefits per shower to break even.

Could ideas close the gap?

Suppose I had a 1% chance per shower of generating an additional useful idea. That idea would need an expected personal payoff of $922, conditional on having it, to contribute $9.22 per shower.

That’s a break-even scenario—not evidence that my shower actually produces it.

Still, it gives me a better question than “What if I invent something amazing?”

It asks how often useful ideas happen, what I do with them, and whether the shower deserves the credit.

The seven-minute alternative

My spreadsheet also includes a seven-minute shower, costing $0.68 in water, heating, and products.

Assuming the same six minutes afterward, the routine becomes 13 minutes total.

The shorter shower saves $6.39 in economic cost each time:

• $0.89 in cash expenses.
• Ten minutes, valued at $5.50.

Over 365 showers, that’s $324.85 in cash savings and almost 61 hours recovered.

Combined economic value: $2,332.35 a year.

Now we have a decision worth considering.

Are the extra ten minutes worth $6.39?

The longer shower may provide more relaxation or thinking time.

But if the seven-minute version gets me clean and delivers similar confidence afterward, the extra ten minutes need to earn their place through those additional benefits.

Would I pay $6.39 for ten more minutes under the water?

Some mornings, absolutely.

Other mornings, I’m mostly standing there because getting out involves being cold for several seconds.

That is an expensive avoidance strategy.

The verdict

My current routine costs $1.57 in cash and $12.65 in time, for a total of $14.22.

With the benefit values I assigned, it fails the business case. The seven-minute version substantially improves the economics, although it also needs more than $5 in benefits to break even.

My next step is simple: try the shorter shower and see what I miss.

If I emerge equally clean, confident, and ready, I’ve found ten minutes a day. If I lose a part of my morning I truly enjoy, I can decide whether to buy it back.

The point of the spreadsheet is to make that choice visible.

Continued showering is approved.

The additional ten minutes must submit a justification.