Okay, what an complicated way of calculation.
But it's fine, we all have different ways to solve any problem...

I guess it's much better if you'll be using satoshi for he calculation (e.g. 1000 sats)

Just knew the value of 1k sats... I'll use our currency PHP, let's say, we found out that:
$1 = PHP 50.00
$1 = 10,000 sats or 0.0001btc.
$0.1 = 1000 sats

then,
1000sats = PHP 5.00
10,000sats = PHP 50
100,000sats= PHP 500
1,000,000sats= PHP 5,000
...

It's uncommon way I guess, but I'm sure it's one of the fastest way to mentally compute for the value that you are looking for.
If you get into it, I guaranteed that it's much quicker than other methods

If you have internet you can just search for it's value.
For my currency, I just type btc to php... but I rarely use it, rather than this, I search for btc to usd.
After that, I already have an approximate equivalence of btv's value for my currency.

Do not be confused.

Bitcoin and Satoshi are different units, satoshi is an smaller unit of btc.
For every bitcoin, there is 100,000,000 satoshis.
Hence, 0.0000727btc and 0.0000727sats are hundred million away from each other.