diff --git a/packages/cosmwasm-stargate/src/cosmwasmclient.ts b/packages/cosmwasm-stargate/src/cosmwasmclient.ts
index 1c5c252e..a48d4f15 100644
--- a/packages/cosmwasm-stargate/src/cosmwasmclient.ts
+++ b/packages/cosmwasm-stargate/src/cosmwasmclient.ts
@@ -19,7 +19,9 @@ import {
   SequenceResponse,
   setupAuthExtension,
   setupBankExtension,
+  setupTxExtension,
   TimeoutError,
+  TxExtension,
 } from "@cosmjs/stargate";
 import { Tendermint34Client, toRfc3339WithNanoseconds } from "@cosmjs/tendermint-rpc";
 import { assert, sleep } from "@cosmjs/utils";
@@ -75,12 +77,16 @@ export interface ContractCodeHistoryEntry {
 /** Use for testing only */
 export interface PrivateCosmWasmClient {
   readonly tmClient: Tendermint34Client | undefined;
-  readonly queryClient: (QueryClient & AuthExtension & BankExtension & WasmExtension) | undefined;
+  readonly queryClient:
+    | (QueryClient & AuthExtension & BankExtension & TxExtension & WasmExtension)
+    | undefined;
 }
 
 export class CosmWasmClient {
   private readonly tmClient: Tendermint34Client | undefined;
-  private readonly queryClient: (QueryClient & AuthExtension & BankExtension & WasmExtension) | undefined;
+  private readonly queryClient:
+    | (QueryClient & AuthExtension & BankExtension & TxExtension & WasmExtension)
+    | undefined;
   private readonly codesCache = new Map<number, CodeDetails>();
   private chainId: string | undefined;
 
@@ -97,6 +103,7 @@ export class CosmWasmClient {
         setupAuthExtension,
         setupBankExtension,
         setupWasmExtension,
+        setupTxExtension,
       );
     }
   }
@@ -114,11 +121,13 @@ export class CosmWasmClient {
     return this.tmClient;
   }
 
-  protected getQueryClient(): (QueryClient & AuthExtension & BankExtension & WasmExtension) | undefined {
+  protected getQueryClient():
+    | (QueryClient & AuthExtension & BankExtension & TxExtension & WasmExtension)
+    | undefined {
     return this.queryClient;
   }
 
-  protected forceGetQueryClient(): QueryClient & AuthExtension & BankExtension & WasmExtension {
+  protected forceGetQueryClient(): QueryClient & AuthExtension & BankExtension & TxExtension & WasmExtension {
     if (!this.queryClient) {
       throw new Error("Query client not available. You cannot use online functionality in offline mode.");
     }
diff --git a/packages/cosmwasm-stargate/src/signingcosmwasmclient.spec.ts b/packages/cosmwasm-stargate/src/signingcosmwasmclient.spec.ts
index 0bca4ead..7310b3c5 100644
--- a/packages/cosmwasm-stargate/src/signingcosmwasmclient.spec.ts
+++ b/packages/cosmwasm-stargate/src/signingcosmwasmclient.spec.ts
@@ -1,7 +1,7 @@
 /* eslint-disable @typescript-eslint/naming-convention */
 import { Secp256k1HdWallet } from "@cosmjs/amino";
 import { sha256 } from "@cosmjs/crypto";
-import { toHex } from "@cosmjs/encoding";
+import { toHex, toUtf8 } from "@cosmjs/encoding";
 import { decodeTxRaw, DirectSecp256k1HdWallet, Registry } from "@cosmjs/proto-signing";
 import {
   AminoMsgDelegate,
@@ -17,12 +17,12 @@ import { DeepPartial, MsgSend } from "cosmjs-types/cosmos/bank/v1beta1/tx";
 import { Coin } from "cosmjs-types/cosmos/base/v1beta1/coin";
 import { MsgDelegate } from "cosmjs-types/cosmos/staking/v1beta1/tx";
 import { AuthInfo, TxBody, TxRaw } from "cosmjs-types/cosmos/tx/v1beta1/tx";
-import { MsgStoreCode } from "cosmjs-types/cosmwasm/wasm/v1/tx";
+import { MsgExecuteContract, MsgStoreCode } from "cosmjs-types/cosmwasm/wasm/v1/tx";
 import Long from "long";
 import pako from "pako";
 import protobuf from "protobufjs/minimal";
 
-import { MsgStoreCodeEncodeObject } from "./encodeobjects";
+import { MsgExecuteContractEncodeObject, MsgStoreCodeEncodeObject } from "./encodeobjects";
 import { SigningCosmWasmClient } from "./signingcosmwasmclient";
 import {
   alice,
@@ -71,6 +71,30 @@ describe("SigningCosmWasmClient", () => {
     });
   });
 
+  describe("simulate", () => {
+    it("works", async () => {
+      pendingWithoutWasmd();
+      const wallet = await DirectSecp256k1HdWallet.fromMnemonic(alice.mnemonic, { prefix: wasmd.prefix });
+      const options = { ...defaultSigningClientOptions, prefix: wasmd.prefix };
+      const client = await SigningCosmWasmClient.connectWithSigner(wasmd.endpoint, wallet, options);
+
+      const executeContractMsg: MsgExecuteContractEncodeObject = {
+        typeUrl: "/cosmwasm.wasm.v1.MsgExecuteContract",
+        value: MsgExecuteContract.fromPartial({
+          sender: alice.address0,
+          contract: deployedHackatom.instances[0].address,
+          msg: toUtf8(`{"release":{}}`),
+          funds: [],
+        }),
+      };
+      const memo = "Go go go";
+      const gasUsed = await client.simulate(alice.address0, [executeContractMsg], memo);
+      expect(gasUsed).toBeGreaterThanOrEqual(101_000);
+      expect(gasUsed).toBeLessThanOrEqual(106_000);
+      client.disconnect();
+    });
+  });
+
   describe("upload", () => {
     it("works", async () => {
       pendingWithoutWasmd();
diff --git a/packages/cosmwasm-stargate/src/signingcosmwasmclient.ts b/packages/cosmwasm-stargate/src/signingcosmwasmclient.ts
index 76175a08..b7a007fc 100644
--- a/packages/cosmwasm-stargate/src/signingcosmwasmclient.ts
+++ b/packages/cosmwasm-stargate/src/signingcosmwasmclient.ts
@@ -29,7 +29,7 @@ import {
   StdFee,
 } from "@cosmjs/stargate";
 import { Tendermint34Client } from "@cosmjs/tendermint-rpc";
-import { assert } from "@cosmjs/utils";
+import { assert, assertDefined } from "@cosmjs/utils";
 import { MsgWithdrawDelegatorReward } from "cosmjs-types/cosmos/distribution/v1beta1/tx";
 import { MsgDelegate, MsgUndelegate } from "cosmjs-types/cosmos/staking/v1beta1/tx";
 import { SignMode } from "cosmjs-types/cosmos/tx/signing/v1beta1/signing";
@@ -196,6 +196,25 @@ export class SigningCosmWasmClient extends CosmWasmClient {
     this.broadcastPollIntervalMs = options.broadcastPollIntervalMs;
   }
 
+  public async simulate(
+    signerAddress: string,
+    messages: readonly EncodeObject[],
+    memo: string | undefined,
+  ): Promise<number> {
+    const anyMsgs = messages.map((m) => this.registry.encodeAsAny(m));
+    const accountFromSigner = (await this.signer.getAccounts()).find(
+      (account) => account.address === signerAddress,
+    );
+    if (!accountFromSigner) {
+      throw new Error("Failed to retrieve account from signer");
+    }
+    const pubkey = encodeSecp256k1Pubkey(accountFromSigner.pubkey);
+    const { sequence } = await this.getSequence(signerAddress);
+    const { gasInfo } = await this.forceGetQueryClient().tx.simulate(anyMsgs, memo, pubkey, sequence);
+    assertDefined(gasInfo);
+    return Uint53.fromString(gasInfo.gasUsed.toString()).toNumber();
+  }
+
   /** Uploads code and returns a receipt, including the code ID */
   public async upload(
     senderAddress: string,