diff --git a/packages/nns/src/icp.spec.ts b/packages/nns/src/icp.spec.ts
new file mode 100644
index 00000000..0f6078a2
--- /dev/null
+++ b/packages/nns/src/icp.spec.ts
@@ -0,0 +1,56 @@
+import { FromStringToTokenError } from "@dfinity/utils";
+import { describe, expect, it } from "@jest/globals";
+import { ICP } from "./icp";
+
+describe("ICP", () => {
+  it("can be initialized from a whole number string", () => {
+    expect(ICP.fromString("1")).toEqual(ICP.fromE8s(BigInt(100000000)));
+    expect(ICP.fromString("1234")).toEqual(ICP.fromE8s(BigInt(123400000000)));
+    expect(ICP.fromString("000001234")).toEqual(
+      ICP.fromE8s(BigInt(123400000000)),
+    );
+    expect(ICP.fromString(" 1")).toEqual(ICP.fromE8s(BigInt(100000000)));
+    expect(ICP.fromString("1,000")).toEqual(ICP.fromE8s(BigInt(100000000000)));
+    expect(ICP.fromString("1'000")).toEqual(ICP.fromE8s(BigInt(100000000000)));
+    expect(ICP.fromString("1'000'000")).toEqual(
+      ICP.fromE8s(BigInt(100000000000000)),
+    );
+  });
+
+  it("can be initialized from a fractional number string", () => {
+    expect(ICP.fromString("0.1")).toEqual(ICP.fromE8s(BigInt(10000000)));
+    expect(ICP.fromString("0.0001")).toEqual(ICP.fromE8s(BigInt(10000)));
+    expect(ICP.fromString("0.00000001")).toEqual(ICP.fromE8s(BigInt(1)));
+    expect(ICP.fromString("0.0000000001")).toEqual(
+      FromStringToTokenError.FractionalMoreThan8Decimals,
+    );
+    expect(ICP.fromString(".01")).toEqual(ICP.fromE8s(BigInt(1000000)));
+  });
+
+  it("can be initialized from a mixed string", () => {
+    expect(ICP.fromString("1.1")).toEqual(ICP.fromE8s(BigInt(110000000)));
+    expect(ICP.fromString("1.1")).toEqual(ICP.fromE8s(BigInt(110000000)));
+    expect(ICP.fromString("12,345.00000001")).toEqual(
+      ICP.fromE8s(BigInt(1234500000001)),
+    );
+    expect(ICP.fromString("12'345.00000001")).toEqual(
+      ICP.fromE8s(BigInt(1234500000001)),
+    );
+    expect(ICP.fromString("12345.00000001")).toEqual(
+      ICP.fromE8s(BigInt(1234500000001)),
+    );
+  });
+
+  it("returns an error on invalid formats", () => {
+    expect(ICP.fromString("1.1.1")).toBe(FromStringToTokenError.InvalidFormat);
+    expect(ICP.fromString("a")).toBe(FromStringToTokenError.InvalidFormat);
+    expect(ICP.fromString("3.a")).toBe(FromStringToTokenError.InvalidFormat);
+    expect(ICP.fromString("123asdf$#@~!")).toBe(
+      FromStringToTokenError.InvalidFormat,
+    );
+  });
+
+  it("rejects negative numbers", () => {
+    expect(ICP.fromString("-1")).toBe(FromStringToTokenError.InvalidFormat);
+  });
+});
diff --git a/packages/nns/src/icp.ts b/packages/nns/src/icp.ts
new file mode 100644
index 00000000..bdf4680d
--- /dev/null
+++ b/packages/nns/src/icp.ts
@@ -0,0 +1,50 @@
+import type { ICPTs } from "@dfinity/nns-proto";
+import {
+  ICPToken,
+  convertStringToE8s,
+  type FromStringToTokenError,
+  type Token,
+} from "@dfinity/utils";
+import { importNnsProto } from "./utils/proto.utils";
+
+/**
+ * We don't extend to keep `fromE8s` and `fromString` as backwards compatible.
+ * @deprecated
+ */
+export class ICP {
+  private constructor(
+    private e8s: bigint,
+    public token: Token,
+  ) {}
+
+  public static fromE8s(amount: bigint): ICP {
+    return new ICP(amount, ICPToken);
+  }
+
+  /**
+   * Initialize from a string. Accepted formats:
+   *
+   * 1234567.8901
+   * 1'234'567.8901
+   * 1,234,567.8901
+   */
+  public static fromString(amount: string): ICP | FromStringToTokenError {
+    const e8s = convertStringToE8s(amount);
+    if (typeof e8s === "bigint") {
+      return new ICP(e8s, ICPToken);
+    }
+    return e8s;
+  }
+
+  public toE8s(): bigint {
+    return this.e8s;
+  }
+
+  public async toProto(): Promise<ICPTs> {
+    const { ICPTs: ICPTsConstructor } = await importNnsProto();
+
+    const proto = new ICPTsConstructor();
+    proto.setE8s(this.e8s.toString());
+    return proto;
+  }
+}
diff --git a/packages/nns/src/index.ts b/packages/nns/src/index.ts
index c6cca6f3..50a7e71b 100644
--- a/packages/nns/src/index.ts
+++ b/packages/nns/src/index.ts
@@ -4,6 +4,7 @@ export * from "./enums/governance.enums";
 export * from "./errors/governance.errors";
 export { GenesisTokenCanister } from "./genesis_token.canister";
 export { GovernanceCanister } from "./governance.canister";
+export { ICP } from "./icp";
 export { SnsWasmCanister } from "./sns_wasm.canister";
 export * from "./types/common";
 export * from "./types/governance.options";