diff --git a/networks/cosmos/src/workflows/plugins/fee-calculation.ts b/networks/cosmos/src/workflows/plugins/fee-calculation.ts
index dd94c15d..3a7dfed8 100644
--- a/networks/cosmos/src/workflows/plugins/fee-calculation.ts
+++ b/networks/cosmos/src/workflows/plugins/fee-calculation.ts
@@ -6,6 +6,7 @@ import { INPUT_VALIDATION_STAGING_KEYS } from './input-validation';
 import { MESSAGE_ENCODING_STAGING_KEYS } from './message-encoding';
 import { SIGNER_INFO_STAGING_KEYS } from './signer-info';
 import { Price } from '@interchainjs/types';
+import Decimal from 'decimal.js';
 
 /**
  * Staging keys created by FeeCalculationPlugin
@@ -63,30 +64,20 @@ export class FeeCalculationPlugin extends BaseWorkflowBuilderPlugin<
       const multiplier = params.options?.multiplier ?? 1.5;
       const gasLimit = BigInt(Math.ceil(Number(gasUsed) * multiplier));
 
-      // Default gas price (this should be configurable)
+      // Default gas price ( Price | 'average' | 'high' | 'low' | undefined)
       let denom = "uatom";
-      let gasPriceValue: string;
+      let gasPriceValue = new Decimal('0.025');
 
-      if (params.options?.gasPrice &&
-        typeof params.options.gasPrice === 'object' &&
-        'amount' in params.options.gasPrice &&
-        'denom' in params.options.gasPrice &&
-        typeof (params.options.gasPrice as any).denom === 'string' &&
-        (params.options.gasPrice as any).amount) {
-        // type Price
-        const price = params.options.gasPrice as Price;
-        denom = price.denom;
-        gasPriceValue = price.amount.toString();
-      } else if (typeof params.options?.gasPrice === 'string' &&
-        !isNaN(Number(params.options.gasPrice))) {
-        // type string (number only)
-        gasPriceValue = params.options.gasPrice;
-      } else {
-        // 'average' | 'high' | 'low' | undefined
-        gasPriceValue = '0.025';
+      // ex) 123.123uatom -> gasPriceValue: "123.123", denom: "uatom")
+      if (typeof params.options?.gasPrice === 'string') {
+        const numberMatch = params.options.gasPrice.match(/^(\d+(?:\.\d+)?)(.*)$/);
+        if (numberMatch && numberMatch.length === 3) {
+          gasPriceValue = new Decimal(numberMatch[1]);
+          denom = numberMatch[2];
+        }
       }
 
-      const amount = BigInt(Math.ceil(Number(gasLimit) * Number(gasPriceValue)));
+      const amount = gasPriceValue.mul(gasLimit.toString()).ceil();
 
       finalFee = {
         amount: [{ denom, amount: amount.toString() }],