# Rounding pressure to 3 decimal places

I have the following expressions to give me the barometric pressure in both hPa and inHg.

((round(#ATM#)*.030)) In Hg

((round(#ATM#))) hPa

These values are frequently displaying with somewhere around 15 decimal places.

I’ve tried wrapping them in (floor), but I must be doing it wrong, particularly with inHg

This seems to work fine for hPa (floor(#ATM#*1000)/1000) hPa
But no matter what I try, inHg still has insane decimal places

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I’ve not used this much. I don’t remember where I found it here in the community, but this is all I’ve got for you.

(round(#ATM# * 0.02953))

It’s worth a shot.

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Then

` ((round(((#ATM#)*.02953)*1000))/1000) `

for 3 decimal places.

No Problem with loads of Parentheses but they have to be put in the right place Little Devils.

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That got me to zero decimal places, which is far better than 15!

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That did the trick, thank you!

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OK, I see what you did, so I tried ((round(((#ATM#) * .02953) * 10))/10) and it gives just one decimal place.

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I know there are other ways to do these things. I like Matties Idea that the maths should explain itself. Some times I just POG arround till it works. In that case nothing explains itself to anyone.

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I like being able to deconstruct the math - it helps me understand it at a deeper level and correct my own mistakes.

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I’ve never been one to be able to go and do the math from scratch, but I can figure out what it’s doing and learn how to edit it and make it do exactly what I want…Some of the time!

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Knowing what to tweek is its own understanding of the Maths. Remembering stuff is half the problem. Having said that I am surprised how much I am remembering. But I have been at it for two years now :::)))

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I take a lot of notes. This is a screen shot of my folder with my Facer notes text files. You’ll notice there are two more sub folders with even more notes.

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Yeah. I have started a favourite Tags File. I will share it when I am Happy with it. But I really must get some folders going. It is all getting a bit messy :::)))

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I have several tabs opened in Notepad++ with things I’ve learned from all of you. Maybe someday I’ll be smart enough to actually save the tabs…

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My issue is always needing the expression that someone posted on the community sometime but not remembering which post it was in or exactly the way the expression was done. I got tired of hunting and one day I started searching for posts and when I would find something useful, I put it in a text file. Then later I figured out I need to note where I had found them so I could credit the poster when I reposted it to answer someone’s question. Live and learn, I guess…

UPDATE: I did a search an found the expression (#ATM# * 0.02953) posted by @mikeoday in the post Barometric pressure conversion from Hpa to inHg? So, I don’t know if I figured out to add the round function or if I seen it somewhere else. Mike’s answer was in a post dated Oct 2019 so it’s been WAY to long for me to remember now.

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