diff --git a/js/src/modals/ExecuteContract/DetailsStep/detailsStep.js b/js/src/modals/ExecuteContract/DetailsStep/detailsStep.js
index b4488729a..3ffb929a9 100644
--- a/js/src/modals/ExecuteContract/DetailsStep/detailsStep.js
+++ b/js/src/modals/ExecuteContract/DetailsStep/detailsStep.js
@@ -15,13 +15,19 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 import React, { Component, PropTypes } from 'react';
-import { MenuItem } from 'material-ui';
+import { Checkbox, MenuItem } from 'material-ui';
 
 import { AddressSelect, Form, Input, Select, TypedInput } from '~/ui';
 import { parseAbiType } from '~/util/abi';
 
 import styles from '../executeContract.css';
 
+const CHECK_STYLE = {
+  position: 'absolute',
+  top: '38px',
+  left: '1em'
+};
+
 export default class DetailsStep extends Component {
   static propTypes = {
     accounts: PropTypes.object.isRequired,
@@ -31,10 +37,12 @@ export default class DetailsStep extends Component {
     onAmountChange: PropTypes.func.isRequired,
     fromAddress: PropTypes.string,
     fromAddressError: PropTypes.string,
+    gasEdit: PropTypes.bool,
     onFromAddressChange: PropTypes.func.isRequired,
     func: PropTypes.object,
     funcError: PropTypes.string,
     onFuncChange: PropTypes.func,
+    onGasEditClick: PropTypes.func,
     values: PropTypes.array.isRequired,
     valuesError: PropTypes.array.isRequired,
     warning: PropTypes.string,
@@ -42,7 +50,7 @@ export default class DetailsStep extends Component {
   }
 
   render () {
-    const { accounts, amount, amountError, fromAddress, fromAddressError, onFromAddressChange, onAmountChange } = this.props;
+    const { accounts, amount, amountError, fromAddress, fromAddressError, gasEdit, onGasEditClick, onFromAddressChange, onAmountChange } = this.props;
 
     return (
       <Form>
@@ -56,12 +64,23 @@ export default class DetailsStep extends Component {
           onChange={ onFromAddressChange } />
         { this.renderFunctionSelect() }
         { this.renderParameters() }
-        <Input
-          label='transaction value (in ETH)'
-          hint='the amount to send to with the transaction'
-          value={ amount }
-          error={ amountError }
-          onSubmit={ onAmountChange } />
+        <div className={ styles.columns }>
+          <div>
+            <Input
+              label='transaction value (in ETH)'
+              hint='the amount to send to with the transaction'
+              value={ amount }
+              error={ amountError }
+              onSubmit={ onAmountChange } />
+          </div>
+          <div>
+            <Checkbox
+              checked={ gasEdit }
+              label='edit gas price or value'
+              onCheck={ onGasEditClick }
+              style={ CHECK_STYLE } />
+          </div>
+        </div>
       </Form>
     );
   }
diff --git a/js/src/modals/ExecuteContract/executeContract.css b/js/src/modals/ExecuteContract/executeContract.css
index a83b373ee..6b7132912 100644
--- a/js/src/modals/ExecuteContract/executeContract.css
+++ b/js/src/modals/ExecuteContract/executeContract.css
@@ -42,3 +42,15 @@
   padding: 0.75em;
   text-align: center;
 }
+
+.columns {
+  display: flex;
+  flex-wrap: wrap;
+  position: relative;
+
+  &>div {
+    flex: 0 1 50%;
+    width: 50%;
+    position: relative;
+  }
+}
diff --git a/js/src/modals/ExecuteContract/executeContract.js b/js/src/modals/ExecuteContract/executeContract.js
index 2db5e2b04..3f7940ca3 100644
--- a/js/src/modals/ExecuteContract/executeContract.js
+++ b/js/src/modals/ExecuteContract/executeContract.js
@@ -17,19 +17,36 @@
 import React, { Component, PropTypes } from 'react';
 import { connect } from 'react-redux';
 import { bindActionCreators } from 'redux';
+import { observer } from 'mobx-react';
 import ActionDoneAll from 'material-ui/svg-icons/action/done-all';
 import ContentClear from 'material-ui/svg-icons/content/clear';
+import NavigationArrowBack from 'material-ui/svg-icons/navigation/arrow-back';
+import NavigationArrowForward from 'material-ui/svg-icons/navigation/arrow-forward';
 
-import { BusyStep, CompletedStep, Button, IdentityIcon, Modal, TxHash } from '~/ui';
+import { BusyStep, Button, CompletedStep, GasPriceEditor, IdentityIcon, Modal, TxHash } from '~/ui';
 import { MAX_GAS_ESTIMATION } from '~/util/constants';
 import { validateAddress, validateUint } from '~/util/validation';
 import { parseAbiType } from '~/util/abi';
 
 import DetailsStep from './DetailsStep';
 
-import ERRORS from '../Transfer/errors';
 import { ERROR_CODES } from '~/api/transport/error';
 
+const STEP_DETAILS = 0;
+const STEP_BUSY_OR_GAS = 1;
+const STEP_BUSY = 2;
+
+const TITLES = {
+  transfer: 'function details',
+  sending: 'sending',
+  complete: 'complete',
+  gas: 'gas selection',
+  rejected: 'rejected'
+};
+const STAGES_BASIC = [TITLES.transfer, TITLES.sending, TITLES.complete];
+const STAGES_GAS = [TITLES.transfer, TITLES.gas, TITLES.sending, TITLES.complete];
+
+@observer
 class ExecuteContract extends Component {
   static contextTypes = {
     api: PropTypes.object.isRequired,
@@ -46,21 +63,22 @@ class ExecuteContract extends Component {
     onFromAddressChange: PropTypes.func.isRequired
   }
 
+  gasStore = new GasPriceEditor.Store(this.context.api, this.props.gasLimit);
+
   state = {
     amount: '0',
     amountError: null,
+    busyState: null,
     fromAddressError: null,
     func: null,
     funcError: null,
-    gas: null,
-    gasLimitError: null,
+    gasEdit: false,
+    rejected: false,
+    step: STEP_DETAILS,
+    sending: false,
     values: [],
     valuesError: [],
-    step: 0,
-    sending: false,
-    busyState: null,
-    txhash: null,
-    rejected: false
+    txhash: null
   }
 
   componentDidMount () {
@@ -79,15 +97,21 @@ class ExecuteContract extends Component {
   }
 
   render () {
-    const { sending } = this.state;
+    const { sending, step, gasEdit, rejected } = this.state;
+    const steps = gasEdit ? STAGES_GAS : STAGES_BASIC;
+
+    if (rejected) {
+      steps[steps.length - 1] = TITLES.rejected;
+    }
 
     return (
       <Modal
         actions={ this.renderDialogActions() }
-        title='execute function'
         busy={ sending }
-        waiting={ [1] }
-        visible>
+        current={ step }
+        steps={ steps }
+        visible
+        waiting={ gasEdit ? [STEP_BUSY] : [STEP_BUSY_OR_GAS] }>
         { this.renderStep() }
       </Modal>
     );
@@ -95,7 +119,7 @@ class ExecuteContract extends Component {
 
   renderDialogActions () {
     const { onClose, fromAddress } = this.props;
-    const { sending, step, fromAddressError, valuesError } = this.state;
+    const { gasEdit, sending, step, fromAddressError, valuesError } = this.state;
     const hasError = fromAddressError || valuesError.find((error) => error);
 
     const cancelBtn = (
@@ -105,21 +129,44 @@ class ExecuteContract extends Component {
         icon={ <ContentClear /> }
         onClick={ onClose } />
     );
+    const postBtn = (
+      <Button
+        key='postTransaction'
+        label='post transaction'
+        disabled={ !!(sending || hasError) }
+        icon={ <IdentityIcon address={ fromAddress } button /> }
+        onClick={ this.postTransaction } />
+    );
+    const nextBtn = (
+      <Button
+        key='nextStep'
+        label='next'
+        icon={ <NavigationArrowForward /> }
+        onClick={ this.onNextClick } />
+    );
+    const prevBtn = (
+      <Button
+        key='prevStep'
+        label='prev'
+        icon={ <NavigationArrowBack /> }
+        onClick={ this.onPrevClick } />
+    );
 
-    if (step === 0) {
+    if (step === STEP_DETAILS) {
       return [
         cancelBtn,
-        <Button
-          key='postTransaction'
-          label='post transaction'
-          disabled={ !!(sending || hasError) }
-          icon={ <IdentityIcon address={ fromAddress } button /> }
-          onClick={ this.postTransaction } />
+        gasEdit ? nextBtn : postBtn
       ];
-    } else if (step === 1) {
+    } else if (step === (gasEdit ? STEP_BUSY : STEP_BUSY_OR_GAS)) {
       return [
         cancelBtn
       ];
+    } else if (gasEdit && (step === STEP_BUSY_OR_GAS)) {
+      return [
+        cancelBtn,
+        prevBtn,
+        postBtn
+      ];
     }
 
     return [
@@ -133,7 +180,8 @@ class ExecuteContract extends Component {
 
   renderStep () {
     const { onFromAddressChange } = this.props;
-    const { step, busyState, gasLimitError, txhash, rejected } = this.state;
+    const { gasEdit, step, busyState, txhash, rejected } = this.state;
+    const { errorEstimated } = this.gasStore;
 
     if (rejected) {
       return (
@@ -144,23 +192,29 @@ class ExecuteContract extends Component {
       );
     }
 
-    if (step === 0) {
+    if (step === STEP_DETAILS) {
       return (
         <DetailsStep
           { ...this.props }
           { ...this.state }
-          warning={ gasLimitError }
+          warning={ errorEstimated }
           onAmountChange={ this.onAmountChange }
           onFromAddressChange={ onFromAddressChange }
           onFuncChange={ this.onFuncChange }
+          onGasEditClick={ this.onGasEditClick }
           onValueChange={ this.onValueChange } />
       );
-    } else if (step === 1) {
+    } else if (step === (gasEdit ? STEP_BUSY : STEP_BUSY_OR_GAS)) {
       return (
         <BusyStep
           title='The function execution is in progress'
           state={ busyState } />
       );
+    } else if (gasEdit && (step === STEP_BUSY_OR_GAS)) {
+      return (
+        <GasPriceEditor
+          store={ this.gasStore } />
+      );
     }
 
     return (
@@ -171,6 +225,7 @@ class ExecuteContract extends Component {
   }
 
   onAmountChange = (amount) => {
+    this.gasStore.setEthValue(amount);
     this.setState({ amount }, this.estimateGas);
   }
 
@@ -221,7 +276,7 @@ class ExecuteContract extends Component {
 
   estimateGas = (_fromAddress) => {
     const { api } = this.context;
-    const { fromAddress, gasLimit } = this.props;
+    const { fromAddress } = this.props;
     const { amount, func, values } = this.state;
     const options = {
       gas: MAX_GAS_ESTIMATION,
@@ -237,18 +292,11 @@ class ExecuteContract extends Component {
       .estimateGas(options, values)
       .then((gasEst) => {
         const gas = gasEst.mul(1.2);
-        let gasLimitError = null;
 
-        if (gas.gte(MAX_GAS_ESTIMATION)) {
-          gasLimitError = ERRORS.gasException;
-        } else if (gas.gt(gasLimit)) {
-          gasLimitError = ERRORS.gasBlockLimit;
-        }
+        console.log(`estimateGas: received ${gasEst.toFormat(0)}, adjusted to ${gas.toFormat(0)}`);
 
-        this.setState({
-          gas,
-          gasLimitError
-        });
+        this.gasStore.setEstimated(gasEst.toFixed(0));
+        this.gasStore.setGas(gas.toFixed(0));
       })
       .catch((error) => {
         console.warn('estimateGas', error);
@@ -258,22 +306,18 @@ class ExecuteContract extends Component {
   postTransaction = () => {
     const { api, store } = this.context;
     const { fromAddress } = this.props;
-    const { amount, func, values } = this.state;
+    const { amount, func, gasEdit, values } = this.state;
     const options = {
-      gas: MAX_GAS_ESTIMATION,
+      gas: this.gasStore.gas,
+      gasPrice: this.gasStore.price,
       from: fromAddress,
       value: api.util.toWei(amount || 0)
     };
 
-    this.setState({ sending: true, step: 1 });
+    this.setState({ sending: true, step: gasEdit ? STEP_BUSY : STEP_BUSY_OR_GAS });
 
     func
-      .estimateGas(options, values)
-      .then((gas) => {
-        options.gas = gas.mul(1.2).toFixed(0);
-        console.log(`estimateGas: received ${gas.toFormat(0)}, adjusted to ${gas.mul(1.2).toFormat(0)}`);
-        return func.postTransaction(options, values);
-      })
+      .postTransaction(options, values)
       .then((requestId) => {
         this.setState({ busyState: 'Waiting for authorization in the Parity Signer' });
 
@@ -296,6 +340,24 @@ class ExecuteContract extends Component {
         store.dispatch({ type: 'newError', error });
       });
   }
+
+  onGasEditClick = () => {
+    this.setState({
+      gasEdit: !this.state.gasEdit
+    });
+  }
+
+  onNextClick = () => {
+    this.setState({
+      step: this.state.step + 1
+    });
+  }
+
+  onPrevClick = () => {
+    this.setState({
+      step: this.state.step - 1
+    });
+  }
 }
 
 function mapStateToProps (state) {
diff --git a/js/src/modals/Transfer/Extras/extras.js b/js/src/modals/Transfer/Extras/extras.js
index 6d2bfc821..def5a22c6 100644
--- a/js/src/modals/Transfer/Extras/extras.js
+++ b/js/src/modals/Transfer/Extras/extras.js
@@ -30,21 +30,14 @@ export default class Extras extends Component {
   }
 
   render () {
-    const { gasStore, onChange, total, totalError } = this.props;
+    const { gasStore, onChange } = this.props;
 
     return (
       <Form>
         { this.renderData() }
         <GasPriceEditor
           store={ gasStore }
-          onChange={ onChange }>
-          <Input
-            disabled
-            label='total transaction amount'
-            hint='the total amount of the transaction'
-            error={ totalError }
-            value={ `${total} ETH` } />
-        </GasPriceEditor>
+          onChange={ onChange } />
       </Form>
     );
   }
diff --git a/js/src/modals/Transfer/store.js b/js/src/modals/Transfer/store.js
index a43057c86..cbb10f17f 100644
--- a/js/src/modals/Transfer/store.js
+++ b/js/src/modals/Transfer/store.js
@@ -408,6 +408,8 @@ export default class TransferStore {
       this.totalError = totalError;
       this.value = value;
       this.valueError = valueError;
+      this.gasStore.setErrorTotal(totalError);
+      this.gasStore.setEthValue(totalEth);
     });
   }
 
diff --git a/js/src/ui/GasPriceEditor/gasPriceEditor.js b/js/src/ui/GasPriceEditor/gasPriceEditor.js
index c6759ddf1..8c94dfca7 100644
--- a/js/src/ui/GasPriceEditor/gasPriceEditor.js
+++ b/js/src/ui/GasPriceEditor/gasPriceEditor.js
@@ -26,8 +26,11 @@ import styles from './gasPriceEditor.css';
 
 @observer
 export default class GasPriceEditor extends Component {
+  static contextTypes = {
+    api: PropTypes.object.isRequired
+  };
+
   static propTypes = {
-    children: PropTypes.node,
     store: PropTypes.object.isRequired,
     onChange: PropTypes.func
   }
@@ -35,9 +38,11 @@ export default class GasPriceEditor extends Component {
   static Store = Store;
 
   render () {
-    const { children, store } = this.props;
-    const { estimated, priceDefault, price, gas, histogram, errorGas, errorPrice } = store;
+    const { api } = this.context;
+    const { store } = this.props;
+    const { estimated, priceDefault, price, gas, histogram, errorGas, errorPrice, errorTotal, totalValue } = store;
 
+    const eth = api.util.fromWei(totalValue).toFormat();
     const gasLabel = `gas (estimated: ${new BigNumber(estimated).toFormat()})`;
     const priceLabel = `price (current: ${new BigNumber(priceDefault).toFormat()})`;
 
@@ -75,7 +80,12 @@ export default class GasPriceEditor extends Component {
           </div>
 
           <div className={ styles.row }>
-            { children }
+            <Input
+              disabled
+              label='total transaction amount'
+              hint='the total amount of the transaction'
+              error={ errorTotal }
+              value={ `${eth} ETH` } />
           </div>
         </div>
       </div>
diff --git a/js/src/ui/GasPriceEditor/store.js b/js/src/ui/GasPriceEditor/store.js
index 3f3e50430..afa5e15b2 100644
--- a/js/src/ui/GasPriceEditor/store.js
+++ b/js/src/ui/GasPriceEditor/store.js
@@ -15,7 +15,7 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 import BigNumber from 'bignumber.js';
-import { action, observable, transaction } from 'mobx';
+import { action, computed, observable, transaction } from 'mobx';
 
 import { ERRORS, validatePositiveNumber } from '~/util/validation';
 import { DEFAULT_GAS, DEFAULT_GASPRICE, MAX_GAS_ESTIMATION } from '~/util/constants';
@@ -24,12 +24,14 @@ export default class GasPriceEditor {
   @observable errorEstimated = null;
   @observable errorGas = null;
   @observable errorPrice = null;
+  @observable errorTotal = null;
   @observable estimated = DEFAULT_GAS;
   @observable histogram = null;
   @observable price = DEFAULT_GASPRICE;
   @observable priceDefault = DEFAULT_GASPRICE;
   @observable gas = DEFAULT_GAS;
   @observable gasLimit = 0;
+  @observable weiValue = '0';
 
   constructor (api, gasLimit, loadDefaults = true) {
     this._api = api;
@@ -40,6 +42,18 @@ export default class GasPriceEditor {
     }
   }
 
+  @computed get totalValue () {
+    try {
+      return new BigNumber(this.gas).mul(this.price).add(this.weiValue);
+    } catch (error) {
+      return new BigNumber(0);
+    }
+  }
+
+  @action setErrorTotal = (errorTotal) => {
+    this.errorTotal = errorTotal;
+  }
+
   @action setEstimated = (estimated) => {
     transaction(() => {
       const bn = new BigNumber(estimated);
@@ -56,6 +70,10 @@ export default class GasPriceEditor {
     });
   }
 
+  @action setEthValue = (weiValue) => {
+    this.weiValue = weiValue;
+  }
+
   @action setHistogram = (gasHistogram) => {
     this.histogram = gasHistogram;
   }