From 20602cb0860674b50aa59ecb9ebbcc6438c77d46 Mon Sep 17 00:00:00 2001
From: 0xbigz <83473873+0xbigz@users.noreply.github.com>
Date: Fri, 7 Apr 2023 18:39:45 -0400
Subject: [PATCH 1/2] bigz/sdk-if-unstake-math

---
 sdk/src/math/insurance.ts | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/sdk/src/math/insurance.ts b/sdk/src/math/insurance.ts
index 79a259660..4ea44775c 100644
--- a/sdk/src/math/insurance.ts
+++ b/sdk/src/math/insurance.ts
@@ -33,3 +33,32 @@ export function unstakeSharesToAmount(
 
 	return amount;
 }
+
+export function unstakeSharesToAmountWithOpenRequest(
+	nShares: BN,
+	withdrawRequestShares: BN,
+	withdrawRequestAmount: BN,
+	totalIfShares: BN,
+	insuranceFundVaultBalance: BN
+): BN {
+	let stakedAmount: BN;
+	if (totalIfShares.gt(ZERO)) {
+		stakedAmount = BN.max(
+			ZERO,
+			nShares
+				.sub(withdrawRequestShares)
+				.mul(insuranceFundVaultBalance)
+				.div(totalIfShares)
+		);
+	} else {
+		stakedAmount = ZERO;
+	}
+
+	const withdrawAmount = BN.min(
+		withdrawRequestAmount,
+		withdrawRequestShares.mul(insuranceFundVaultBalance).div(totalIfShares)
+	);
+	const amount = withdrawAmount.add(stakedAmount);
+
+	return amount;
+}

From 8fa022189fbda3a898e189a0260cd9c1f7a139bb Mon Sep 17 00:00:00 2001
From: 0xbigz <83473873+0xbigz@users.noreply.github.com>
Date: Fri, 7 Apr 2023 18:42:17 -0400
Subject: [PATCH 2/2] changelog update

---
 CHANGELOG.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0f4d9f337..1f80fa70d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,7 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Features
-
+- sdk: more accurate calculation of insurance stake value during unstake request ([#426](https://github.com/drift-labs/protocol-v2/pull/426))
 ### Fixes
 
 ### Breaking