# Is there a way to convert Bitcoin to Satoshie and vice versa?

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Apparently it's bad to use floats when working with bitcoin. But the API i'm using doesn't really give an option to convert Bitcoin to Satoshie or vice versa. https://www.block.io/api/simple/php

So I'm trying to figure out a way to do that function with PHP.

Here is the code I found that converts from Satoshie to Bitcoin.  My question is, how do I convert from Bitcoin to Satoshie.

```function convertToBTCFromSatoshi(\$value) {
\$BTC = \$value / 100000000 ;
return \$BTC;
}
function formatBTC(\$value) {
\$value = sprintf('%.8f', \$value);
\$value = rtrim(\$value, '0') . ' BTC';
return \$value;
}
echo formatBTC(convertToBTCFromSatoshi(5000));```

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This is what converts.

```function convertToBTCFromSatoshi(\$value) {
\$BTC = \$value / 100000000 ;
return \$BTC;
}```

Do I need to say anything more?

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I may regret asking this but - are you sure about that?  Is going from a to b involves division, wouldn't the reverse involve multiplication?

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2 hours ago, requinix said:

This is what converts.

```
function convertToBTCFromSatoshi(\$value) {
\$BTC = \$value / 100000000 ;
return \$BTC;
}```

Do I need to say anything more?

2 hours ago, ginerjm said:

I may regret asking this but - are you sure about that?  Is going from a to b involves division, wouldn't the reverse involve multiplication?

Correct, the multiplication would do the reverse. Like this.

```function convertToSatoshi(\$value) {
\$SAT = \$value * 100000000 ;
return \$SAT;
}```

I was more worried about reversing the decimal part of the 2nd function, but I just realized that it's not needed to convert to Satoshie.

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