From 2937837fc0869134535363cb96fb29598478649e Mon Sep 17 00:00:00 2001
From: Slyghtning <hieblmi@protonmail.com>
Date: Tue, 24 Jun 2025 22:13:55 +0200
Subject: [PATCH 1/2] chainfee: method to round up the fee for a given
 transaction weight

---
 lnwallet/chainfee/rates.go      |  8 ++++++++
 lnwallet/chainfee/rates_test.go | 11 +++++++++++
 2 files changed, 19 insertions(+)

diff --git a/lnwallet/chainfee/rates.go b/lnwallet/chainfee/rates.go
index 20f4f1e1d..735cbd20c 100644
--- a/lnwallet/chainfee/rates.go
+++ b/lnwallet/chainfee/rates.go
@@ -71,6 +71,14 @@ func (s SatPerKWeight) FeeForWeight(wu lntypes.WeightUnit) btcutil.Amount {
 	return btcutil.Amount(s) * btcutil.Amount(wu) / 1000
 }
 
+// FeeForWeightRoundUp calculates the fee resulting from this fee rate and the
+// given weight in weight units (wu), rounding up to the nearest satoshi.
+func (s SatPerKWeight) FeeForWeightRoundUp(
+	wu lntypes.WeightUnit) btcutil.Amount {
+
+	return (btcutil.Amount(s)*btcutil.Amount(wu) + 999) / 1000
+}
+
 // FeeForVByte calculates the fee resulting from this fee rate and the given
 // size in vbytes (vb).
 func (s SatPerKWeight) FeeForVByte(vb lntypes.VByte) btcutil.Amount {
diff --git a/lnwallet/chainfee/rates_test.go b/lnwallet/chainfee/rates_test.go
index 11aa35adf..d3e4740f3 100644
--- a/lnwallet/chainfee/rates_test.go
+++ b/lnwallet/chainfee/rates_test.go
@@ -3,6 +3,7 @@ package chainfee
 import (
 	"testing"
 
+	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/stretchr/testify/require"
 )
 
@@ -20,3 +21,13 @@ func TestSatPerVByteConversion(t *testing.T) {
 	// 1 sat/vb should be equal to 250 sat/kw.
 	require.Equal(t, SatPerKWeight(250), rate.FeePerKWeight())
 }
+
+// TestFeeForWeightRoundUp checks that the FeeForWeightRoundUp method correctly
+// rounds up the fee for a given weight.
+func TestFeeForWeightRoundUp(t *testing.T) {
+	feeRate := SatPerVByte(1).FeePerKWeight()
+	txWeight := lntypes.WeightUnit(674) // 674 weight units is 168.5 vb.
+
+	require.EqualValues(t, 168, feeRate.FeeForWeight(txWeight))
+	require.EqualValues(t, 169, feeRate.FeeForWeightRoundUp(txWeight))
+}

From 45b26cf2d4c5ca0e5f56479428e1fdb14726e575 Mon Sep 17 00:00:00 2001
From: Slyghtning <hieblmi@protonmail.com>
Date: Wed, 25 Jun 2025 10:36:57 +0200
Subject: [PATCH 2/2] docs: update release notes

---
 docs/release-notes/release-notes-0.19.2.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/docs/release-notes/release-notes-0.19.2.md b/docs/release-notes/release-notes-0.19.2.md
index 37ff73ea9..a1e25ad03 100644
--- a/docs/release-notes/release-notes-0.19.2.md
+++ b/docs/release-notes/release-notes-0.19.2.md
@@ -36,6 +36,10 @@
 
 ## Functional Enhancements
 
+- [Adds](https://github.com/lightningnetwork/lnd/pull/9989) a method 
+  `FeeForWeightRoundUp` to the `chainfee` package which rounds up a calculated 
+  fee value to the nearest satoshi.
+
 ## RPC Additions
 
 * When querying
@@ -89,6 +93,7 @@ much more slowly.
 
 * Abdulkbk
 * djkazic
+* hieblmi
 * Olaoluwa Osuntokun
 * Yong Yu
 * Ziggie