1 files changed, 10 insertions, 1 deletions
diff --git a/ui/app/helpers/utils/conversions.util.js b/ui/app/helpers/utils/conversions.util.js
index b4ec50626..5e1c21ff7 100644
--- a/ui/app/helpers/utils/conversions.util.js
+++ b/ui/app/helpers/utils/conversions.util.js
@@ -1,6 +1,6 @@
 import ethUtil from 'ethereumjs-util'
 import { ETH, GWEI, WEI } from '../constants/common'
-import { conversionUtil, addCurrencies } from './conversion-util'
+import { conversionUtil, addCurrencies, subtractCurrencies } from './conversion-util'
 
 export function bnToHex (inputBn) {
   return ethUtil.addHexPrefix(inputBn.toString(16))
@@ -92,6 +92,15 @@ export function addHexWEIsToDec (aHexWEI, bHexWEI) {
   })
 }
 
+export function subtractHexWEIsToDec (aHexWEI, bHexWEI) {
+  return subtractCurrencies(aHexWEI, bHexWEI, {
+    aBase: 16,
+    bBase: 16,
+    fromDenomination: 'WEI',
+    numberOfDecimals: 6,
+  })
+}
+
 export function decEthToConvertedCurrency (ethTotal, convertedCurrency, conversionRate) {
   return conversionUtil(ethTotal, {
     fromNumericBase: 'dec',