diff --git a/app/src/androidTest/java/to/bitkit/test/annotations/DeviceUiIntegration.kt b/app/src/androidTest/java/to/bitkit/test/annotations/DeviceUiIntegration.kt
new file mode 100644
index 000000000..4dfb8fad8
--- /dev/null
+++ b/app/src/androidTest/java/to/bitkit/test/annotations/DeviceUiIntegration.kt
@@ -0,0 +1,5 @@
+package to.bitkit.test.annotations
+
+@Retention(AnnotationRetention.RUNTIME)
+@Target(AnnotationTarget.CLASS, AnnotationTarget.FUNCTION)
+annotation class DeviceUiIntegration
diff --git a/app/src/androidTest/java/to/bitkit/ui/screens/widgets/calculator/CalculatorCardIntegrationTest.kt b/app/src/androidTest/java/to/bitkit/ui/screens/widgets/calculator/CalculatorCardIntegrationTest.kt
new file mode 100644
index 000000000..0824e5e04
--- /dev/null
+++ b/app/src/androidTest/java/to/bitkit/ui/screens/widgets/calculator/CalculatorCardIntegrationTest.kt
@@ -0,0 +1,346 @@
+package to.bitkit.ui.screens.widgets.calculator
+
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.test.assertTextContains
+import androidx.compose.ui.test.assertIsDisplayed
+import androidx.compose.ui.test.hasSetTextAction
+import androidx.compose.ui.test.hasText
+import androidx.compose.ui.test.junit4.createComposeRule
+import androidx.compose.ui.test.onRoot
+import androidx.compose.ui.test.performTextClearance
+import androidx.compose.ui.test.performTextInput
+import androidx.compose.ui.test.printToString
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.ViewModelStore
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.android.testing.HiltAndroidRule
+import dagger.hilt.android.testing.HiltAndroidTest
+import dagger.hilt.android.testing.UninstallModules
+import dagger.hilt.components.SingletonComponent
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.runBlocking
+import org.junit.After
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import to.bitkit.data.AppCacheData
+import to.bitkit.data.CacheStore
+import to.bitkit.data.SettingsData
+import to.bitkit.data.SettingsStore
+import to.bitkit.data.WidgetsData
+import to.bitkit.data.WidgetsStore
+import to.bitkit.di.RepoModule
+import to.bitkit.models.BitcoinDisplayUnit
+import to.bitkit.models.FxRate
+import to.bitkit.models.USD
+import to.bitkit.models.WidgetType
+import to.bitkit.models.WidgetWithPosition
+import to.bitkit.models.WidgetsBackupV1
+import to.bitkit.models.widget.CalculatorValues
+import to.bitkit.repositories.AmountInputHandler
+import to.bitkit.repositories.CurrencyRepo
+import to.bitkit.repositories.WidgetsRepo
+import to.bitkit.test.annotations.DeviceIntegration
+import to.bitkit.test.annotations.DeviceUiIntegration
+import to.bitkit.ui.screens.widgets.calculator.components.CalculatorCard
+import to.bitkit.ui.theme.AppThemeSurface
+import to.bitkit.viewmodels.CurrencyViewModel
+import java.util.Locale
+import javax.inject.Inject
+import javax.inject.Named
+import kotlin.test.assertEquals
+
+@HiltAndroidTest
+@UninstallModules(RepoModule::class)
+@RunWith(AndroidJUnit4::class)
+@DeviceIntegration
+@DeviceUiIntegration
+class CalculatorCardIntegrationTest {
+
+    @get:Rule
+    val hiltRule = HiltAndroidRule(this)
+
+    @get:Rule
+    val composeTestRule = createComposeRule()
+
+    @Inject
+    lateinit var widgetsRepo: WidgetsRepo
+
+    @Inject
+    lateinit var currencyRepo: CurrencyRepo
+
+    @Inject
+    lateinit var widgetsStore: WidgetsStore
+
+    @Inject
+    lateinit var settingsStore: SettingsStore
+
+    @Inject
+    lateinit var cacheStore: CacheStore
+
+    private lateinit var viewModelStore: ViewModelStore
+    private lateinit var calculatorViewModel: CalculatorViewModel
+    private lateinit var currencyViewModel: CurrencyViewModel
+    private lateinit var previousWidgetsData: WidgetsData
+    private lateinit var previousSettingsData: SettingsData
+    private lateinit var previousCacheData: AppCacheData
+    private lateinit var previousLocale: Locale
+
+    @Before
+    fun setUp() {
+        previousLocale = Locale.getDefault()
+        Locale.setDefault(Locale.US)
+        hiltRule.inject()
+
+        runBlocking {
+            previousWidgetsData = widgetsStore.data.first()
+            previousSettingsData = settingsStore.data.first()
+            previousCacheData = cacheStore.data.first()
+
+            settingsStore.update {
+                it.copy(
+                    selectedCurrency = USD,
+                    displayUnit = BitcoinDisplayUnit.MODERN,
+                    showWidgetTitles = true,
+                )
+            }
+            cacheStore.update { it.copy(cachedRates = listOf(testUsdRate)) }
+            widgetsStore.restoreFromBackup(
+                WidgetsBackupV1(
+                    createdAt = TEST_CREATED_AT,
+                    widgets = WidgetsData(
+                        widgets = listOf(WidgetWithPosition(type = WidgetType.CALCULATOR, position = 0)),
+                        calculatorValues = emptyCalculatorValues,
+                    ),
+                )
+            ).getOrThrow()
+
+            currencyRepo.currencyState.first {
+                it.selectedCurrency == USD &&
+                    it.displayUnit == BitcoinDisplayUnit.MODERN &&
+                    it.rates.any { rate -> rate.quote == USD && rate.lastPrice == TEST_USD_RATE }
+            }
+            widgetsRepo.widgetsDataFlow.first {
+                it.widgets == listOf(WidgetWithPosition(type = WidgetType.CALCULATOR, position = 0)) &&
+                    it.calculatorValues == emptyCalculatorValues
+            }
+        }
+
+        calculatorViewModel = createCalculatorViewModel()
+        currencyViewModel = createCurrencyViewModel()
+    }
+
+    @After
+    fun tearDown() {
+        if (::viewModelStore.isInitialized) {
+            viewModelStore.clear()
+        }
+        runBlocking {
+            widgetsStore.restoreFromBackup(
+                WidgetsBackupV1(
+                    createdAt = TEST_CREATED_AT,
+                    widgets = previousWidgetsData,
+                )
+            ).getOrThrow()
+            settingsStore.update { previousSettingsData }
+            cacheStore.update { previousCacheData }
+        }
+        Locale.setDefault(previousLocale)
+    }
+
+    @Test
+    fun btcInputUpdatesFiatValueAndPersistsWidgetState() {
+        setCalculatorCard()
+
+        replaceInput(BTC_INPUT_INDEX, "12340")
+
+        waitForValues(
+            btcValue = "12340",
+            fiatValue = "12.34",
+        )
+
+        assertInputText(BTC_INPUT_INDEX, "12 340")
+        assertInputText(FIAT_INPUT_INDEX, "12.34")
+        assertPersistedValues(
+            btcValue = "12340",
+            fiatValue = "12.34",
+        )
+    }
+
+    @Test
+    fun fiatInputUpdatesBtcValueAndPersistsWidgetState() {
+        setCalculatorCard()
+
+        replaceInput(FIAT_INPUT_INDEX, "10.00")
+
+        waitForValues(
+            btcValue = "10000",
+            fiatValue = "10.00",
+        )
+
+        assertInputText(BTC_INPUT_INDEX, "10 000")
+        assertInputText(FIAT_INPUT_INDEX, "10.00")
+        assertPersistedValues(
+            btcValue = "10000",
+            fiatValue = "10.00",
+        )
+    }
+
+    private fun createCalculatorViewModel(): CalculatorViewModel {
+        viewModelStore = ViewModelStore()
+        return ViewModelProvider(
+            viewModelStore,
+            object : ViewModelProvider.Factory {
+                @Suppress("UNCHECKED_CAST")
+                override fun <T : ViewModel> create(modelClass: Class<T>): T {
+                    return CalculatorViewModel(
+                        widgetsRepo = widgetsRepo,
+                    ) as T
+                }
+            },
+        )[CalculatorViewModel::class.java]
+    }
+
+    private fun createCurrencyViewModel(): CurrencyViewModel = ViewModelProvider(
+        viewModelStore,
+        object : ViewModelProvider.Factory {
+            @Suppress("UNCHECKED_CAST")
+            override fun <T : ViewModel> create(modelClass: Class<T>): T {
+                return CurrencyViewModel(
+                    currencyRepo = currencyRepo,
+                ) as T
+            }
+        },
+    )[CurrencyViewModel::class.java]
+
+    private fun setCalculatorCard() {
+        composeTestRule.setContent {
+            AppThemeSurface {
+                CalculatorCard(
+                    currencyViewModel = currencyViewModel,
+                    calculatorViewModel = calculatorViewModel,
+                    showWidgetTitle = true,
+                    modifier = Modifier.fillMaxWidth()
+                )
+            }
+        }
+        composeTestRule.waitForIdle()
+        composeTestRule.waitUntil(timeoutMillis = TIMEOUT_MS) {
+            composeTestRule.onAllNodes(hasSetTextAction()).fetchSemanticsNodes().size == INPUT_COUNT
+        }
+    }
+
+    private fun inputAt(index: Int) = composeTestRule.onAllNodes(hasSetTextAction())[index]
+
+    private fun replaceInput(
+        index: Int,
+        text: String,
+    ) {
+        inputAt(index).performTextClearance()
+        inputAt(index).performTextInput(text)
+    }
+
+    private fun waitForValues(
+        btcValue: String,
+        fiatValue: String,
+    ) {
+        runCatching {
+            composeTestRule.waitUntil(timeoutMillis = TIMEOUT_MS) {
+                calculatorViewModel.calculatorValues.value.btcValue == btcValue &&
+                    calculatorViewModel.calculatorValues.value.fiatValue == fiatValue
+            }
+        }.onFailure {
+            throw AssertionError(
+                buildString {
+                    append("Expected calculatorValues btcValue='$btcValue', fiatValue='$fiatValue', ")
+                    append("but was '${calculatorViewModel.calculatorValues.value}'. Persisted values were ")
+                    append("'${widgetsRepo.widgetsDataFlow.value.calculatorValues}'. Semantics tree:\n")
+                    append(composeTestRule.onRoot(useUnmergedTree = true).printToString())
+                },
+                it,
+            )
+        }
+
+        val expectedValues = CalculatorValues(
+            btcValue = btcValue,
+            fiatValue = fiatValue,
+        )
+        runCatching {
+            composeTestRule.waitUntil(timeoutMillis = TIMEOUT_MS) {
+                widgetsRepo.widgetsDataFlow.value.calculatorValues == expectedValues
+            }
+        }.onFailure {
+            throw AssertionError(
+                "Expected persisted values '$expectedValues', but was " +
+                    "'${widgetsRepo.widgetsDataFlow.value.calculatorValues}'",
+                it,
+            )
+        }
+    }
+
+    private fun assertInputText(
+        inputIndex: Int,
+        text: String,
+    ) {
+        inputAt(inputIndex).assertTextContains(text, substring = true)
+        composeTestRule.onNode(hasText(text, substring = true), useUnmergedTree = true)
+            .assertIsDisplayed()
+    }
+
+    private fun assertPersistedValues(
+        btcValue: String,
+        fiatValue: String,
+    ) {
+        assertEquals(
+            CalculatorValues(
+                btcValue = btcValue,
+                fiatValue = fiatValue,
+            ),
+            widgetsRepo.widgetsDataFlow.value.calculatorValues,
+        )
+    }
+
+    companion object {
+        private const val BTC_INPUT_INDEX = 0
+        private const val FIAT_INPUT_INDEX = 1
+        private const val INPUT_COUNT = 2
+        private const val TIMEOUT_MS = 5_000L
+        private const val TEST_CREATED_AT = 0L
+        private const val TEST_USD_RATE = "100000"
+
+        private val emptyCalculatorValues = CalculatorValues(
+            btcValue = "",
+            fiatValue = "",
+        )
+
+        private val testUsdRate = FxRate(
+            symbol = "BTCUSD",
+            lastPrice = TEST_USD_RATE,
+            base = "BTC",
+            baseName = "Bitcoin",
+            quote = USD,
+            quoteName = "US Dollar",
+            currencySymbol = "$",
+            currencyFlag = "US",
+            lastUpdatedAt = TEST_CREATED_AT,
+        )
+    }
+
+    @Module
+    @InstallIn(SingletonComponent::class)
+    object TestRepoModule {
+
+        @Provides
+        fun bindAmountInputHandler(currencyRepo: CurrencyRepo): AmountInputHandler = currencyRepo
+
+        @Provides
+        @Named("enablePolling")
+        fun provideEnablePolling(): Boolean = false
+    }
+}