diff --git a/ui/components/app/gas-timing/gas-timing.component.js b/ui/components/app/gas-timing/gas-timing.component.js
index 0f28ea7dc..95e5bc24a 100644
--- a/ui/components/app/gas-timing/gas-timing.component.js
+++ b/ui/components/app/gas-timing/gas-timing.component.js
@@ -71,8 +71,8 @@ export default function GasTiming({
     ) {
       // getGasFeeTimeEstimate requires parameters in string format
       getGasFeeTimeEstimate(
-        new BigNumber(priority).toString(10),
-        new BigNumber(fee).toString(10),
+        new BigNumber(priority, 10).toString(10),
+        new BigNumber(fee, 10).toString(10),
       ).then((result) => {
         if (maxFeePerGas === fee && maxPriorityFeePerGas === priority) {
           setCustomEstimatedTime(result);
diff --git a/ui/components/ui/numeric-input/numeric-input.component.js b/ui/components/ui/numeric-input/numeric-input.component.js
index 0befdf4f6..948ecec92 100644
--- a/ui/components/ui/numeric-input/numeric-input.component.js
+++ b/ui/components/ui/numeric-input/numeric-input.component.js
@@ -4,6 +4,8 @@ import PropTypes from 'prop-types';
 import Typography from '../typography/typography';
 import { COLORS, TYPOGRAPHY } from '../../../helpers/constants/design-system';
 
+const DECIMAL_REGEX = /\.(\d*)/u;
+
 export default function NumericInput({
   detailText = '',
   value = 0,
@@ -26,7 +28,10 @@ export default function NumericInput({
           }
         }}
         onChange={(e) => {
-          onChange?.(parseFloat(e.target.value || 0, 10));
+          const newValue = e.target.value;
+          const match = DECIMAL_REGEX.exec(newValue);
+          if (match?.[1]?.length >= 15) return;
+          onChange?.(parseFloat(newValue || 0, 10));
         }}
         min="0"
         autoFocus={autoFocus}