diff --git a/src/features/markets/components/constants.ts b/src/features/markets/components/constants.ts
index 9b613c99..10acd846 100644
--- a/src/features/markets/components/constants.ts
+++ b/src/features/markets/components/constants.ts
@@ -18,19 +18,21 @@ export enum SortColumn {
 
 export const GAS_COSTS = {
   // direct supply through bundler, no approval
-  BUNDLER_SUPPLY: 180_000,
+  BUNDLER_SUPPLY: 180_000n,
 
   // An additional supply through the bundler, already approved
-  SINGLE_SUPPLY: 80_000,
+  SINGLE_SUPPLY: 80_000n,
 
-  SINGLE_WITHDRAW: 100_000,
+  SINGLE_WITHDRAW: 100_000n,
 
   // single withdraw + supply
-  BUNDLER_REBALANCE: 240_000,
+  BUNDLER_REBALANCE: 240_000n,
 
   // directly borrow from Morpho Blue
-  DIRECT_WITHDRAW: 100_000,
+  DIRECT_WITHDRAW: 100_000n,
 };
 
 // additional multiplier for buffer gas. Rabby uses 1.5
-export const GAS_MULTIPLIER = 1.4;
+// Using fraction (14/10) to avoid floating-point precision issues with BigInt
+export const GAS_MULTIPLIER_NUMERATOR = 14n;
+export const GAS_MULTIPLIER_DENOMINATOR = 10n;
diff --git a/src/hooks/useMultiMarketSupply.ts b/src/hooks/useMultiMarketSupply.ts
index acf7bd9b..4e4fcb0e 100644
--- a/src/hooks/useMultiMarketSupply.ts
+++ b/src/hooks/useMultiMarketSupply.ts
@@ -10,7 +10,7 @@ import { formatBalance } from '@/utils/balance';
 import { getBundlerV2, MONARCH_TX_IDENTIFIER } from '@/utils/morpho';
 import { SupportedNetworks } from '@/utils/networks';
 import type { Market } from '@/utils/types';
-import { GAS_COSTS, GAS_MULTIPLIER } from '@/features/markets/components/constants';
+import { GAS_COSTS, GAS_MULTIPLIER_NUMERATOR, GAS_MULTIPLIER_DENOMINATOR } from '@/features/markets/components/constants';
 import { useERC20Approval } from './useERC20Approval';
 import { useStyledToast } from './useStyledToast';
 import { useUserMarketsCache } from '@/stores/useUserMarketsCache';
@@ -76,7 +76,7 @@ export function useMultiMarketSupply(
 
     const txs: `0x${string}`[] = [];
 
-    let gas = undefined;
+    let gas: bigint | undefined = undefined;
 
     try {
       // Handle ETH wrapping if needed
@@ -121,7 +121,7 @@ export function useMultiMarketSupply(
         );
 
         const numOfSupplies = supplies.length;
-        gas = GAS_COSTS.BUNDLER_SUPPLY + GAS_COSTS.SINGLE_SUPPLY * (numOfSupplies - 1);
+        gas = GAS_COSTS.BUNDLER_SUPPLY + GAS_COSTS.SINGLE_SUPPLY * BigInt(numOfSupplies - 1);
       }
 
       tracking.update('supplying');
@@ -164,7 +164,7 @@ export function useMultiMarketSupply(
         value: useEth ? totalAmount : 0n,
 
         // Only add gas for standard approval flow -> skip gas estimation
-        gas: gas ? BigInt(gas * GAS_MULTIPLIER) : undefined,
+        gas: gas ? (gas * GAS_MULTIPLIER_NUMERATOR) / GAS_MULTIPLIER_DENOMINATOR : undefined,
       });
 
       batchAddUserMarkets(
diff --git a/src/hooks/useRebalance.ts b/src/hooks/useRebalance.ts
index ca497f5d..6f16d2b0 100644
--- a/src/hooks/useRebalance.ts
+++ b/src/hooks/useRebalance.ts
@@ -6,7 +6,7 @@ import { useTransactionWithToast } from '@/hooks/useTransactionWithToast';
 import { useTransactionTracking } from '@/hooks/useTransactionTracking';
 import { getBundlerV2, MONARCH_TX_IDENTIFIER } from '@/utils/morpho';
 import type { GroupedPosition, RebalanceAction } from '@/utils/types';
-import { GAS_COSTS, GAS_MULTIPLIER } from '@/features/markets/components/constants';
+import { GAS_COSTS, GAS_MULTIPLIER_NUMERATOR, GAS_MULTIPLIER_DENOMINATOR } from '@/features/markets/components/constants';
 import { useERC20Approval } from './useERC20Approval';
 import { useMorphoAuthorization } from './useMorphoAuthorization';
 import { usePermit2 } from './usePermit2';
@@ -255,7 +255,7 @@ export const useRebalance = (groupedPosition: GroupedPosition, onRebalance?: ()
     try {
       const { withdrawTxs, supplyTxs, allMarketKeys } = generateRebalanceTxData();
 
-      let multicallGas = undefined;
+      let multicallGas: bigint | undefined = undefined;
 
       if (usePermit2Setting) {
         // --- Permit2 Flow ---
@@ -318,14 +318,14 @@ export const useRebalance = (groupedPosition: GroupedPosition, onRebalance?: ()
         multicallGas = GAS_COSTS.BUNDLER_REBALANCE;
 
         if (supplyTxs.length > 1) {
-          multicallGas += GAS_COSTS.SINGLE_SUPPLY * (supplyTxs.length - 1);
+          multicallGas += GAS_COSTS.SINGLE_SUPPLY * BigInt(supplyTxs.length - 1);
         }
 
         if (withdrawTxs.length > 1) {
-          multicallGas += GAS_COSTS.SINGLE_WITHDRAW * (withdrawTxs.length - 1);
+          multicallGas += GAS_COSTS.SINGLE_WITHDRAW * BigInt(withdrawTxs.length - 1);
         }
 
-        console.log('multicallGas', multicallGas);
+        console.log('multicallGas', multicallGas.toString());
       }
 
       // Step Final: Execute multicall
@@ -341,7 +341,7 @@ export const useRebalance = (groupedPosition: GroupedPosition, onRebalance?: ()
         to: bundlerAddress,
         data: multicallTx,
         chainId: groupedPosition.chainId,
-        gas: multicallGas ? BigInt(multicallGas * GAS_MULTIPLIER) : undefined,
+        gas: multicallGas ? (multicallGas * GAS_MULTIPLIER_NUMERATOR) / GAS_MULTIPLIER_DENOMINATOR : undefined,
       });
 
       batchAddUserMarkets(
diff --git a/src/hooks/useSupplyMarket.ts b/src/hooks/useSupplyMarket.ts
index 2c258396..e7556d40 100644
--- a/src/hooks/useSupplyMarket.ts
+++ b/src/hooks/useSupplyMarket.ts
@@ -12,7 +12,7 @@ import { useTransactionTracking } from '@/hooks/useTransactionTracking';
 import { formatBalance } from '@/utils/balance';
 import { getBundlerV2, MONARCH_TX_IDENTIFIER } from '@/utils/morpho';
 import type { Market } from '@/utils/types';
-import { GAS_COSTS, GAS_MULTIPLIER } from '@/features/markets/components/constants';
+import { GAS_COSTS, GAS_MULTIPLIER_NUMERATOR, GAS_MULTIPLIER_DENOMINATOR } from '@/features/markets/components/constants';
 
 export type SupplyStepType = 'approve' | 'signing' | 'supplying';
 
@@ -163,7 +163,7 @@ export function useSupplyMarket(market: Market, onSuccess?: () => void): UseSupp
     try {
       const txs: `0x${string}`[] = [];
 
-      let gas = undefined;
+      let gas: bigint | undefined = undefined;
 
       if (useEth) {
         txs.push(
@@ -244,7 +244,7 @@ export function useSupplyMarket(market: Market, onSuccess?: () => void): UseSupp
         value: useEth ? supplyAmount : 0n,
 
         // Only add gas for standard approval flow -> skip gas estimation
-        gas: gas ? BigInt(gas * GAS_MULTIPLIER) : undefined,
+        gas: gas ? (gas * GAS_MULTIPLIER_NUMERATOR) / GAS_MULTIPLIER_DENOMINATOR : undefined,
       });
 
       batchAddUserMarkets([
diff --git a/src/hooks/useVaultV2Deposit.ts b/src/hooks/useVaultV2Deposit.ts
index 0393c668..03b67bd1 100644
--- a/src/hooks/useVaultV2Deposit.ts
+++ b/src/hooks/useVaultV2Deposit.ts
@@ -10,7 +10,7 @@ import { useTransactionWithToast } from '@/hooks/useTransactionWithToast';
 import { useTransactionTracking } from '@/hooks/useTransactionTracking';
 import { formatBalance } from '@/utils/balance';
 import { getBundlerV2, MONARCH_TX_IDENTIFIER } from '@/utils/morpho';
-import { GAS_COSTS, GAS_MULTIPLIER } from '@/features/markets/components/constants';
+import { GAS_COSTS, GAS_MULTIPLIER_NUMERATOR, GAS_MULTIPLIER_DENOMINATOR } from '@/features/markets/components/constants';
 
 export type VaultDepositStepType = 'approve' | 'signing' | 'depositing';
 
@@ -141,7 +141,7 @@ export function useVaultV2Deposit({
   const executeDepositTransaction = useCallback(async () => {
     try {
       const txs: `0x${string}`[] = [];
-      let gas = undefined;
+      let gas: bigint | undefined = undefined;
 
       if (usePermit2Setting) {
         // Permit2 flow: Sign permit and use bundler to deposit
@@ -200,7 +200,7 @@ export function useVaultV2Deposit({
         value: 0n,
 
         // Only add gas for standard approval flow -> skip gas estimation
-        gas: gas ? BigInt(gas * GAS_MULTIPLIER) : undefined,
+        gas: gas ? (gas * GAS_MULTIPLIER_NUMERATOR) / GAS_MULTIPLIER_DENOMINATOR : undefined,
       });
 
       tracking.complete();