diff --git a/core/ui/build.gradle.kts b/core/ui/build.gradle.kts
index 751904086..5019f547f 100644
--- a/core/ui/build.gradle.kts
+++ b/core/ui/build.gradle.kts
@@ -98,4 +98,5 @@ dependencies {
     implementation(libs.jsoup)
 
     api(libs.capturable)
+    api(libs.evaluator)
 }
\ No newline at end of file
diff --git a/core/ui/src/main/kotlin/ru/tech/imageresizershrinker/core/ui/widget/controls/ResizeImageField.kt b/core/ui/src/main/kotlin/ru/tech/imageresizershrinker/core/ui/widget/controls/ResizeImageField.kt
index c6ef3ea70..84cf99d00 100644
--- a/core/ui/src/main/kotlin/ru/tech/imageresizershrinker/core/ui/widget/controls/ResizeImageField.kt
+++ b/core/ui/src/main/kotlin/ru/tech/imageresizershrinker/core/ui/widget/controls/ResizeImageField.kt
@@ -36,6 +36,7 @@ import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.outlined.Calculate
 import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
@@ -48,13 +49,16 @@ import androidx.compose.ui.graphics.Shape
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.input.KeyboardType
 import androidx.compose.ui.unit.dp
+import com.github.keelar.exprk.Expressions
 import ru.tech.imageresizershrinker.core.domain.image.model.ImageFormat
 import ru.tech.imageresizershrinker.core.domain.image.model.ImageInfo
 import ru.tech.imageresizershrinker.core.domain.model.IntegerSize
 import ru.tech.imageresizershrinker.core.resources.R
 import ru.tech.imageresizershrinker.core.ui.utils.helper.ImageUtils
 import ru.tech.imageresizershrinker.core.ui.utils.helper.ImageUtils.restrict
+import ru.tech.imageresizershrinker.core.ui.utils.provider.rememberLocalEssentials
 import ru.tech.imageresizershrinker.core.ui.widget.enhanced.EnhancedAlertDialog
+import ru.tech.imageresizershrinker.core.ui.widget.enhanced.EnhancedButton
 import ru.tech.imageresizershrinker.core.ui.widget.enhanced.EnhancedIconButton
 import ru.tech.imageresizershrinker.core.ui.widget.modifier.container
 import ru.tech.imageresizershrinker.core.ui.widget.text.RoundedTextField
@@ -200,20 +204,49 @@ internal fun ResizeImageFieldImpl(
         interactionSource = interactionSource
     )
 
+    var calculatorExpression by rememberSaveable(value) {
+        mutableStateOf(value)
+    }
+    val essentials = rememberLocalEssentials()
     EnhancedAlertDialog(
         visible = showCalculator,
         onDismissRequest = { showCalculator = false },
         confirmButton = {
-
+            EnhancedButton(
+                onClick = {
+                    runCatching {
+                        Expressions().eval(calculatorExpression)
+                    }.onFailure {
+                        essentials.showFailureToast(it)
+                    }.onSuccess {
+                        onValueChange(it.toInt().toString())
+                        showCalculator = false
+                    }
+                }
+            ) {
+                Text(stringResource(R.string.apply))
+            }
         },
         title = {
-
+            Text(
+                text = stringResource(R.string.calculate)
+            )
         },
         icon = {
-
+            Icon(
+                imageVector = Icons.Outlined.Calculate,
+                contentDescription = null
+            )
         },
         dismissButton = {
-
+            EnhancedButton(
+                containerColor = MaterialTheme.colorScheme.secondaryContainer,
+                onClick = {
+                    showCalculator = false
+                }
+            ) {
+                Text(stringResource(R.string.close))
+            }
         }
     )
 }
\ No newline at end of file
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 27f2feced..cfc6304bc 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -77,8 +77,10 @@ moshi = "1.15.2"
 aboutlibraries = "11.4.0"
 junit = "4.13.2"
 bouncycastle = "1.79"
+evaluator = "1.0.0"
 
 [libraries]
+evaluator = { module = "com.github.T8RIN:KotlinEvaluator", version.ref = "evaluator" }
 aboutlibraries-m3 = { module = "com.mikepenz:aboutlibraries-compose-m3", version.ref = "aboutlibraries" }
 moshi = { module = "com.squareup.moshi:moshi-kotlin", version.ref = "moshi" }
 trickle = { module = "com.github.t8rin:trickle", version.ref = "trickle" }