I'm a waitress, and pie is $12.50.

I'm Australian. I normally manage a pie with 5 digits, unless it's particularly crumbly or runny, in which case I will sometimes use 10!

I'm a liar and I use all the digits of pi.

I haven't typed the digits of pi for probably 20 years because it's defined as a double precision float in all the programming libraries I use.

Ya know, this thread has inspired me. I'm a sound engineer, and find myself yelling "check one two three four" in the michrophone to test it all the time. I'm gonna start reciting the digits of Pi instead, and then as I learn them, I'll progressively advance how many numbers of Pi that I use in my everyday job :D

I work at a library, though. I should probably just go with poetry or Douglas Adams or something, but this makes me sound much more impressive

As a mathematician, I don’t use any digits, but the symbol π.

baker. I measure pie based on how much I can fit in my mouth

I work in healthcare and I've yet to use even a single digit of pi

Software engineer.. we also use all 16 digits of pi

I am a farmer who has to graft pipe cuts at various angles. i use 3.14159. which is plenty since i am measuring my cuts to the nearest eighth of an inch and i am not sending this ish to the moon.

Retail, and to my knowledge among all my coworkers we have used zero digits of pi.

When I code in C++ I use 15 digits of pi after the decimal point (double float) but I have only rarely coded for money and have never used pi for those work products, so again, zero digits on the clock.

Ditto for restaurant work, although 2 decimal points would be more than enough if I needed the volume of a cake or other round food.

I'm an auditor. Zero digits is the norm if I have to use Pi there is something VERY wrong

I'm a consultant and I use whatever Android calculator gives me

When I worked on a website with a map on it I used 15

50000kms is the kind of distances you get going around the earth so to get it down to a millimeter precision from 50k I think 8 or 10 digits required?

So I just put 15

Software Engineering. 16 sigfigs across 64 bits

I'm British, not American, so I use 7/22.

As a pilot I can't think of a time I've ever done numbers math with pi. Private pilots are taught to use an E6B flight computer, which is basically a device for accurately drawing and measuring the triangle you're looking to solve instead of doing algebra and arithmetic.

In the wood shop, if I do have to do algebra rather than just drawing a circle with a compass, I'll use 3.14, and I still have to round to the nearest 32nd of an inch.

Engineering student. I typically use whatever number of digits the calculator gives me in calculator computations, but that's unnecessary. IMO for a design, an engineer should use at least as many digits of pi as needed to not lose any significance due to truncating pi specifically. Practically, this means: keep as many significant digits as your best measurement. In my experience, measurements have usually been good for 3 significant digits.

For back-of-the-envelope or order-of-magnitude calculations where I only need to get in the ballpark of correctness, I'll use 3 (i.e., one significant digit). For example, if I order a pizza with a diameter of 12 inches, A ≈ 36 * 3 in^2 = 108 in^2 is a fine ballpark approximation that I can do in my head to the real area A = 36π in^2 ≈ 113.097... in^2 that my calculator gives me.

I'm a programmer and I remember 33 digits, but in practice I never use pi because I never have to deal with geometry

I work in trails, like what you might walk on, and in the rare case I need pi, I use 3.14. This week, we have a meeting to talk about some things on 14 March. I will be using cornbread because I do not know how to make a pie but I will eat the pie others make. I look forward to this meeting.

Answering my own question: I work in web development and my usual value for pi is the standard JavaScript Math.PI. JavaScript uses 64-bit floats, which are accurate to about 15 decimal places. But that's how many digits the computer uses. For practical math, I don't think I've ever needed more than 2 digits of accuracy in an equation involving pi.

If anyone here wants a fun way to memorize more digits, enjoy this song!

Really glad I have a legit reason to share this old thing

Mostly I'll just go with M_PI.

355/113 = 3.14159292035398 is close enough for my needs.

The State of Indiana tried to define it to 1 digit by law.

https://en.wikipedia.org/wiki/Indiana_pi_bill?wprov=sfla1

Thankfully, the bill was never passed.

Structural engineer, and it depends. If I am doing structural or quantity calculations, I can get away with 3.14 (3 digits).

If I'm dealing with survey coordinates defined by horizontal curves, I'll have to use at least 10 digits.

Prototyping. I just checked and my slide rule has a notch for pi. So, all of them.