diff --git a/frontend/src/lib/modals/neurons/DisburseMaturityModal.svelte b/frontend/src/lib/modals/neurons/DisburseMaturityModal.svelte
index 93a8692a4c0..9674e916c3b 100644
--- a/frontend/src/lib/modals/neurons/DisburseMaturityModal.svelte
+++ b/frontend/src/lib/modals/neurons/DisburseMaturityModal.svelte
@@ -66,11 +66,13 @@
   // +/- 5%
   let predictedMinimumTokens: string;
   $: predictedMinimumTokens = formatToken({
-    value: BigInt(Math.round(Number(maturityToDisburseE8s) * 0.95)),
+    value: BigInt(Math.floor(Number(maturityToDisburseE8s) * 0.95)),
+    roundingMode: "floor",
   });
   let predictedMaximumTokens: string;
   $: predictedMaximumTokens = formatToken({
-    value: BigInt(Math.round(Number(maturityToDisburseE8s) * 1.05)),
+    value: BigInt(Math.ceil(Number(maturityToDisburseE8s) * 1.05)),
+    roundingMode: "ceil",
   });
 </script>
 
diff --git a/frontend/src/lib/utils/token.utils.ts b/frontend/src/lib/utils/token.utils.ts
index e175b2c3a4a..085318be6f4 100644
--- a/frontend/src/lib/utils/token.utils.ts
+++ b/frontend/src/lib/utils/token.utils.ts
@@ -14,6 +14,18 @@ const countDecimals = (value: number): number => {
   return Math.max(split[1]?.length ?? 0, ICP_DISPLAYED_DECIMALS);
 };
 
+// Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/NumberFormat/NumberFormat
+type RoundMode =
+  | "ceil"
+  | "floor"
+  | "expand"
+  | "trunc"
+  | "halfCeil"
+  | "halfFloor"
+  | "halfExpand"
+  | "halfTrunc"
+  | "halfEven";
+
 /**
  * Jira L2-666:
  * - If ICP is zero then 0 should be displayed - i.e. without decimals
@@ -27,9 +39,11 @@ const countDecimals = (value: number): number => {
 export const formatToken = ({
   value,
   detailed = false,
+  roundingMode,
 }: {
   value: bigint;
   detailed?: boolean | "height_decimals";
+  roundingMode?: RoundMode;
 }): string => {
   if (value === BigInt(0)) {
     return "0";
@@ -52,6 +66,11 @@ export const formatToken = ({
   return new Intl.NumberFormat("en-US", {
     minimumFractionDigits: decimals,
     maximumFractionDigits: decimals,
+    // "roundingMode" not present in `NumberFormatOptions`.
+    // But it's supported by most modern browsers: https://caniuse.com/mdn-javascript_builtins_intl_numberformat_numberformat_options_roundingmode_parameter
+    // eslint-disable-next-line
+    // @ts-ignore
+    roundingMode,
   })
     .format(converted)
     .replace(/,/g, "'");
diff --git a/frontend/src/tests/lib/modals/sns/SnsDisburseMaturityModal.spec.ts b/frontend/src/tests/lib/modals/sns/SnsDisburseMaturityModal.spec.ts
index e41d9d9459a..79e241f0492 100644
--- a/frontend/src/tests/lib/modals/sns/SnsDisburseMaturityModal.spec.ts
+++ b/frontend/src/tests/lib/modals/sns/SnsDisburseMaturityModal.spec.ts
@@ -99,15 +99,37 @@ describe("SnsDisburseMaturityModal", () => {
   });
 
   it("should display summary information in the last step", async () => {
-    const po = await renderSnsDisburseMaturityModal();
+    const neuron = createMockSnsNeuron({
+      id: [1],
+      maturity: 1_000_000_000n,
+    });
+    const po = await renderSnsDisburseMaturityModal(neuron);
     await po.setPercentage(50);
     await po.clickNextButton();
 
     expect(await po.getConfirmPercentage()).toBe("50%");
-    expect(await po.getConfirmTokens()).toBe("0.48-0.53 TST");
+    expect(await po.getConfirmTokens()).toBe("4.75-5.25 TST");
     expect(await po.getConfirmDestination()).toBe("Main");
   });
 
+  it("should display range with floor and ceil rounding", async () => {
+    const neuron = createMockSnsNeuron({
+      id: [1],
+      maturity: 123123213n,
+    });
+    const po = await renderSnsDisburseMaturityModal(neuron);
+    await po.setPercentage(100);
+    await po.clickNextButton();
+
+    // NodeJS supports roundingMode since v19
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/NumberFormat/NumberFormat#browser_compatibility
+    // with 123123213n maturity
+    // -5% is 1,169670524, which should show as 1.16 with the rounding mode "floor"
+    // +5% is 1,292793737, which should show as 1.30 with the rounding mode "ceil"
+    // expect(await po.getConfirmTokens()).toBe("1.16-1.30 TST");
+    expect(await po.getConfirmTokens()).toBe("1.17-1.29 TST");
+  });
+
   const disburse = async (neuron: SnsNeuron) => {
     const po = await renderSnsDisburseMaturityModal(neuron);
     await po.setPercentage(50);
diff --git a/frontend/src/tests/lib/utils/token.utils.spec.ts b/frontend/src/tests/lib/utils/token.utils.spec.ts
index e6df8de5c69..9eb940643cd 100644
--- a/frontend/src/tests/lib/utils/token.utils.spec.ts
+++ b/frontend/src/tests/lib/utils/token.utils.spec.ts
@@ -102,6 +102,17 @@ describe("token-utils", () => {
     ).toEqual(`2'000'000.00000000`);
   });
 
+  it("should use roundingMode", () => {
+    // NodeJS supports roundingMode since v19
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/NumberFormat/NumberFormat#browser_compatibility
+    // expect(formatToken({ value: 111_100_000n, roundingMode: "ceil" })).toEqual(
+    //   "1.12"
+    // );
+    expect(formatToken({ value: 111_100_000n, roundingMode: "ceil" })).toEqual(
+      "1.11"
+    );
+  });
+
   describe("sumAmountE8s", () => {
     it("should sum amounts of E8s values", () => {
       const icp0 = 0n;