diff --git a/src/special/london/BlockRow.tsx b/src/special/london/BlockRow.tsx
index 1f01e28..f8da89c 100644
--- a/src/special/london/BlockRow.tsx
+++ b/src/special/london/BlockRow.tsx
@@ -1,5 +1,5 @@
 import React from "react";
-import { ethers } from "ethers";
+import { ethers, FixedNumber } from "ethers";
 import BlockLink from "../../components/BlockLink";
 import TimestampAge from "../../components/TimestampAge";
 import { ExtendedBlock } from "../../useErigonHooks";
@@ -41,7 +41,13 @@ const BlockRow: React.FC<BlockRowProps> = ({ now, block, baseFeeDelta }) => {
       </div>
       <div className="text-right">
         <div className="relative">
-          <span>{block.baseFeePerGas?.div(1e9).toString()} Gwei</span>
+          <span>
+            {FixedNumber.from(block.baseFeePerGas)
+              .divUnsafe(FixedNumber.from(1e9))
+              .round(0)
+              .toUnsafeFloat()}{" "}
+            Gwei
+          </span>
           <Blip value={baseFeeDelta} />
         </div>
       </div>
diff --git a/src/special/london/Blocks.tsx b/src/special/london/Blocks.tsx
index ab1a152..a07cfe6 100644
--- a/src/special/london/Blocks.tsx
+++ b/src/special/london/Blocks.tsx
@@ -5,7 +5,7 @@ import React, {
   useMemo,
   useCallback,
 } from "react";
-import { ethers } from "ethers";
+import { ethers, FixedNumber } from "ethers";
 import { Line } from "react-chartjs-2";
 import { Transition } from "@headlessui/react";
 import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
@@ -176,10 +176,15 @@ const Blocks: React.FC<BlocksProps> = ({ latestBlock, targetBlockNumber }) => {
               block={b}
               baseFeeDelta={
                 i < all.length - 1
-                  ? b
-                      .baseFeePerGas!.sub(all[i + 1].baseFeePerGas!)
-                      .div(1e9)
-                      .toNumber()
+                  ? FixedNumber.from(b.baseFeePerGas!)
+                      .divUnsafe(FixedNumber.from(1e9))
+                      .round(0)
+                      .subUnsafe(
+                        FixedNumber.from(all[i + 1].baseFeePerGas!)
+                          .divUnsafe(FixedNumber.from(1e9))
+                          .round(0)
+                      )
+                      .toUnsafeFloat()
                   : 0
               }
             />