<p>No, one vbyte [vB] is equal to four weightunits [wu]. The people working on C-Lightning use &quot;sipa&quot; interchangeably for a weightunit.</p>
<p>1,000 sat/kvB = 1 sat/vB<br />
1 sat/vB = 0.25 sat/wu<br />
0.25 sat/wu = 250 sat/kwu</p>
<p>20 sat/vB = 5,000 sat/kwu</p>
<p>Also see: <a href="https://bitcoin.stackexchange.com/a/89418/5406">Is there a difference between bytes and virtual bytes (vbytes)?</a></p>

CC BY-SA 4.0
2021-05-15T20:53:37.633Z
2021-05-15T20:53:37.633Z
Murch
<p>While reading documentation of C-Lightning I found this in section about making onchain transactions with the wallet (funding and withdrawing the wallet):</p>
<blockquote>
<p><strong>feerate</strong>  is  an optional feerate to use. It can be one of the strings
urgent (aim for next block), normal (next 4 blocks or so) or slow
(next 100 blocks or so) to use lightningd's internal estimates: normal
is the default. Otherwise, feerate is a number, with an optional
suffix: <strong>perkw means the number is  interpreted  as
satoshi-per-kilosipa  (weight), and perkb means it is interpreted
bitcoind-style as satoshi-per-kilobyte</strong>. Omitting the suffix is
equivalent to perkb.</p>
</blockquote>
<p>I am used to sats/vB as this is used by most wallets I know and also by e.g. blockstream.info explorer. What would be equivalent of, lets say, 20 sat/vB in perkw and perkb units?</p>
<p>My understanding is that 1 sat/vB = 1000 perkw, so 20 sat/vB would be 20000 perkw. Is this correct?</p>

<transaction-fees><core-lightning><block-weight>
Different fee rate units - sat/vB, sat perkw, sat perkb
urza.cc
# Different fee rate units - sat/vB, sat perkw, sat perkb

(Asked by: username_0 on 2021-05-15)

While reading documentation of C-Lightning I found this in section about making onchain transactions with the wallet (funding and withdrawing the wallet):

> **feerate** is an optional feerate to use. It can be one of the strings
> urgent (aim for next block), normal (next 4 blocks or so) or slow
> (next 100 blocks or so) to use lightningd's internal estimates: normal
> is the default. Otherwise, feerate is a number, with an optional
> suffix: **perkw means the number is interpreted as
> satoshi-per-kilosipa (weight), and perkb means it is interpreted
> bitcoind-style as satoshi-per-kilobyte**. Omitting the suffix is
> equivalent to perkb.

I am used to sats/vB as this is used by most wallets I know and also by e.g. blockstream.info explorer. What would be equivalent of, lets say, 20 sat/vB in perkw and perkb units?

My understanding is that 1 sat/vB = 1000 perkw, so 20 sat/vB would be 20000 perkw. Is this correct?

**Tags:** transaction-fees, core-lightning, block-weight


---

## 1 answers

### Answer by username_1 on 2021-05-15. Score: 4 | Accepted answer

No, one vbyte [vB] is equal to four weightunits [wu]. The people working on C-Lightning use "sipa" interchangeably for a weightunit.

1,000 sat/kvB = 1 sat/vB  
1 sat/vB = 0.25 sat/wu  
0.25 sat/wu = 250 sat/kwu

20 sat/vB = 5,000 sat/kwu

Also see: [Is there a difference between bytes and virtual bytes (vbytes)?](https://bitcoin.stackexchange.com/a/89418/5406)


---

