Before settling down to read this post, please keep any hot beverage away from you that may spill, get some smelling salts, and ask a friend to check in on you. I was in my office at work with the door closed, yet someone next door was still able to hear me yelp, “What the [expletive]?” after I plugged some numbers into some very revealing financial calculators. It was a little embarrassing…

Brown Bag LunchI pointed Zac to these calculators a while ago, before I took the finance class that changed my life. He played around with them for quite some time, but I didn’t want to use them because I really didn’t want to confront how much money I was burning by going out for lunch all the time.

But since I was feeling a bit bummed because it’s the beginning of the month and I’ve just paid off a ton of bills, I figured I should look for ways to cut my spending to boost my checking account. So, I turned to this previously avoided lunch calculator as a starting point.

The lunch calculator allows you to figure out how much money you would save if you were to brown bag your lunch instead of eating out, and then how much you would earn from investing those lunch savings. I’m still in the process of paying off debts, so I’m in no place to invest just yet, but I am working (ever so hard) on raising start-up capital for the coffee shop and building an emergency fund of three months living expenses.

Here are the numbers I plugged into the site’s calculator:

Cheap Home Lunch price: $2.00
Eating Out Lunch Price: $7.00
Days eaten per year: 250
Years to Calculate: 3
Investment Yield: 5.05%

With some good bargain-hunting, I figured I could make lunch with wholesome ingredients averaging at $2.00 a day. I easily spend between $5 – $8 a day when I go out to lunch. (We have delicious food in San Francisco, but it doesn’t come cheap if you want to eat healthy.) The site suggests using 250 eating days a year for the comparison, but you can change that if you want. I picked three years of savings for the calculation because that’s about when I’d like to open up the coffee shop. Currently E*Trade offers 5.05% interest on savings accounts, so I used that as my investment yield.

The whopping figure in invested lunch savings I came up with is $3,942.56. Even if you assume a 2.5% inflation rate (latest CPI-U numbers) for the next three years, that $3,942.56 is $3,661.06 in today’s money. Not too shabby!

This Hugh Chou guy has some other mighty interesting calculators that astonished me.

For the same three year savings period, I used his Booze/Beverage Calculator to determine that if I cut buying drinks from 5 drinks a week to just 3 drinks a week, I’d have $1,640.11 in invested savings.

I used the Stop Buying Expensive Coffee and Save Calculator to figure out that if Zac and I switched to making our own brew at home, we’d each have $1,143.34 in invested savings in three years. That would be $2,228.68 dollars that we could put towards a down payment for a house.

By making a few adjustments in my spending per these calculators, the total of my individual invested savings would add up to $6,726.01. Factoring in inflation, that’s $6,245.77 in today’s money. Yikes! That’s a lot of money to be throwing away.

There are plenty more calculators on this website to play around with, but don’t say I didn’t warn you about how shocking it can be.