Lbs to Kg conversion help!

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Hi everyone! I have been having trouble converting lbs to kg.

This is the question I am trying to solve: 232lbs = ? Kg

If I search it on google, the answer given is 105.233 Kg, I somehow keep getting 105.454.

This is how I did it:

2.2 lbs=1 kg

232lbs x (1kg/2.2lbs)

232kg / 2.2

(232*10) / (2.2*10) I do this to balance the decimal.

2320 / 22

I do the long division and I keep getting 105.454

What am I doing wrong? Please help!

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Specializes in Critical Care.

Sometimes, the internet is wrong.

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Specializes in CCU, SICU, CVSICU, Precepting & Teaching.

232/2.2 = 105.45. You're doing it right. A bit more complicated than it has to be, but right.

I think you're experiencing a rounding error. According to "Ask Numbers", a kilogram is equal to 2.20462262 pounds. Divide 232 by THAT number, and you get 105.233.

In nursing, we generally don't worry about anything beyond the second decimal place -- so 220 pounds equals 100 kg. And 232 pounds is equal to 105.45.

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Ruby Vee said:
232/2.2 = 105.45. You're doing it right. A bit more complicated than it has to be, but right.

I think you're experiencing a rounding error. According to "Ask Numbers", a kilogram is equal to 2.20462262 pounds. Divide 232 by THAT number, and you get 105.233.

In nursing, we generally don't worry about anything beyond the second decimal place -- so 220 pounds equals 100 kg. And 232 pounds is equal to 105.45.

Thank you so much! I was seriously losing it over this problem since last night! Also you mentioned that the way I was doing it is more complicated, do you have tips so I stop making it harder for myself? Thanks again!

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emmjayy said:
Sometimes, the internet is wrong.

I guess it was still right haha. Thanks for commenting!

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Specializes in NICU, RNC.
Squidney said:
do you have tips so I stop making it harder for myself? Thanks again!

Just divide the lbs by 2.2. 1 step, super easy.

So, 220 lbs/2.2 = 100 kg

100 lbs/2.2 = 45.45 kg

150 lbs/2.2 = 68.18 kg

Stop using 4 steps, it's a simple 1 step calculation. :D

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Specializes in CCU, SICU, CVSICU, Precepting & Teaching.
Squidney said:
Thank you so much! I was seriously losing it over this problem since last night! Also you mentioned that the way I was doing it is more complicated, do you have tips so I stop making it harder for myself? Thanks again!

For now, keep doing it the way you're doing it. After you've done a few hundred problems/conversions, you will understand the relationships and be able to skip a few steps. Or, you could do what I did and reveiw a basic algebra text. But you seem to understand how to set up the problem, so I'm thinking you just need more practice.

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jgardner said:
Just divide the lbs by 2.2. 1 step, super easy.

So, 220 lbs/2.2 = 100 kg

100 lbs/2.2 = 45.45 kg

150 lbs/2.2 = 68.18 kg

Stop using 4 steps, it's a simple 1 step calculation. :D

This is how I actually do it when just doing practice questions haha! I just thought it'd be better to post each step when I was asking for help so it's easier for other posters to point exactly where I went wrong!

But thank you for posting this as I feel like other students reading this would benefit from you tip!

Thank you!

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Ruby Vee said:
For now, keep doing it the way you're doing it. After you've done a few hundred problems/conversions, you will understand the relationships and be able to skip a few steps. Or, you could do what I did and reveiw a basic algebra text. But you seem to understand how to set up the problem, so I'm thinking you just need more practice.

I will definitely do more practice questions! Thanks, Ruby!

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Specializes in Critical Care.
Squidney said:
I guess it was still right haha. Thanks for commenting!

Haha I meant to say more but got distracted! Just wanted to let you know I ran the calculation and got the same answer you did and was going to hypothesize that the internet used a more precise conversion to come up with an answer that differed from your own :p

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2.2 pounds to the kilo is the generally accepted conversion everywhere and all I've ever used in calculating BSA for chemotherapy or pediatric dose calculations in a peds clinic. If you use 2.2 you're not wrong.

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Have you ever tried deminsional analysis for solving your pharm problems? It seriously keeps things straight for conversions!

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