diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/activities/MainActivity.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/activities/MainActivity.kt
index 462d2d55..da759a74 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/activities/MainActivity.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/activities/MainActivity.kt
@@ -7,11 +7,11 @@ import android.view.Menu
 import android.view.MenuItem
 import android.view.View
 import android.view.WindowManager
+import com.simplemobiletools.calculator.BuildConfig
 import com.simplemobiletools.calculator.R
 import com.simplemobiletools.calculator.extensions.config
 import com.simplemobiletools.calculator.extensions.updateViewColors
 import com.simplemobiletools.calculator.helpers.*
-import com.simplemobiletools.calculator.BuildConfig
 import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.commons.helpers.LICENSE_AUTOFITTEXTVIEW
 import com.simplemobiletools.commons.helpers.LICENSE_ESPRESSO
@@ -20,7 +20,6 @@ import com.simplemobiletools.commons.models.FAQItem
 import com.simplemobiletools.commons.models.Release
 import kotlinx.android.synthetic.main.activity_main.*
 import me.grantland.widget.AutofitHelper
-import java.math.BigDecimal
 
 class MainActivity : SimpleActivity(), Calculator {
     private var storedTextColor = 0
@@ -157,8 +156,8 @@ class MainActivity : SimpleActivity(), Calculator {
     }
 
     // used only by Robolectric
-    override fun setValueBigDecimal(d: BigDecimal) {
-        calc.setValue(Formatter.bigDecimalToString(d))
+    override fun setValueDouble(d: Double) {
+        calc.setValue(Formatter.doubleToString(d))
         calc.lastKey = DIGIT
     }
 
diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/Calculator.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/Calculator.kt
index 3fa73431..1ad20b9f 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/Calculator.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/Calculator.kt
@@ -1,12 +1,11 @@
 package com.simplemobiletools.calculator.helpers
 
 import android.content.Context
-import java.math.BigDecimal
 
 interface Calculator {
     fun setValue(value: String, context: Context)
 
-    fun setValueBigDecimal(d: BigDecimal)
+    fun setValueDouble(d: Double)
 
     fun setFormula(value: String, context: Context)
 }
diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/CalculatorImpl.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/CalculatorImpl.kt
index c4861172..76e6cd18 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/CalculatorImpl.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/CalculatorImpl.kt
@@ -6,7 +6,6 @@ import com.simplemobiletools.calculator.operation.OperationFactory
 import com.simplemobiletools.calculator.operation.PercentOperation
 import com.simplemobiletools.commons.extensions.areDigitsOnly
 import com.simplemobiletools.commons.extensions.toast
-import java.math.BigDecimal
 
 class CalculatorImpl(calculator: Calculator, val context: Context) {
     var displayedNumber: String? = null
@@ -18,8 +17,8 @@ class CalculatorImpl(calculator: Calculator, val context: Context) {
 
     private var isFirstOperation = false
     private var resetValue = false
-    private var baseValue: BigDecimal = BigDecimal.ZERO
-    private var secondValue: BigDecimal = BigDecimal.ZERO
+    private var baseValue = 0.0
+    private var secondValue = 0.0
     private val operations = listOf("+", "-", "*", "/", "^", "%", "√")
     private var moreOperationsInRaw = false
 
@@ -37,8 +36,8 @@ class CalculatorImpl(calculator: Calculator, val context: Context) {
     }
 
     private fun resetValues() {
-        baseValue = BigDecimal.ZERO
-        secondValue = BigDecimal.ZERO
+        baseValue = 0.0
+        secondValue = 0.0
         resetValue = false
         lastOperation = ""
         displayedNumber = ""
@@ -63,7 +62,7 @@ class CalculatorImpl(calculator: Calculator, val context: Context) {
         val sign = getSign(lastOperation)
 
         if (sign.isNotEmpty()) {
-            if (secondValue.compareTo(BigDecimal.ZERO) == 0 && sign == "/") {
+            if (secondValue == 0.0 && sign == "/") {
                 context.toast(context.getString(R.string.formula_divide_by_zero_error))
             }
 
@@ -102,16 +101,16 @@ class CalculatorImpl(calculator: Calculator, val context: Context) {
             return str
         }
 
-        val doubleValue = Formatter.stringToBigDecimal(str)
+        val doubleValue = Formatter.stringToDouble(str)
         return doubleValue.format()
     }
 
-    private fun updateResult(value: BigDecimal) {
+    private fun updateResult(value: Double) {
         setValue(value.format())
         baseValue = value
     }
 
-    private fun getDisplayedNumberAsDouble() = Formatter.stringToBigDecimal(displayedNumber!!)
+    private fun getDisplayedNumberAsDouble() = Formatter.stringToDouble(displayedNumber!!)
 
     fun handleResult() {
         if (moreOperationsInRaw) {
@@ -131,7 +130,7 @@ class CalculatorImpl(calculator: Calculator, val context: Context) {
         }
 
         if (lastOperation == ROOT && inputDisplayedFormula.startsWith("√")) {
-            baseValue = 1.toBigDecimal()
+            baseValue = 1.0
         }
 
         val operation = OperationFactory.forId(lastOperation!!, baseValue, secondValue)
@@ -206,7 +205,7 @@ class CalculatorImpl(calculator: Calculator, val context: Context) {
     private fun handlePercent() {
         val operation = PercentOperation(baseValue, getSecondValue(), lastOperation ?: "")
         val result = operation.getResult()
-        setFormula("${baseValue.format()}${getSign(lastOperation)}${getSecondValue()}%")
+        setFormula("${baseValue.format()}${getSign(lastOperation)}${getSecondValue().format()}%")
         secondValue = result
         updateResult(result)
         inputDisplayedFormula = displayedNumber ?: ""
@@ -295,14 +294,14 @@ class CalculatorImpl(calculator: Calculator, val context: Context) {
         setValue(inputDisplayedFormula)
     }
 
-    private fun getSecondValue(): BigDecimal {
+    private fun getSecondValue(): Double {
         val valueToCheck = if (inputDisplayedFormula.startsWith("-")) {
             inputDisplayedFormula.substring(1)
         } else {
             inputDisplayedFormula
         }
 
-        return valueToCheck.substring(valueToCheck.indexOfAny(operations, 0, false) + 1).toBigDecimal()
+        return valueToCheck.substring(valueToCheck.indexOfAny(operations, 0, false) + 1).toDouble()
     }
 
     private fun zeroClicked() {
diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/Formatter.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/Formatter.kt
index f7941ea0..c98fb297 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/Formatter.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/Formatter.kt
@@ -1,24 +1,23 @@
 package com.simplemobiletools.calculator.helpers
 
-import java.math.BigDecimal
 import java.text.DecimalFormat
 import java.text.DecimalFormatSymbols
 import java.util.*
 
 object Formatter {
-    fun bigDecimalToString(d: BigDecimal): String {
+    fun doubleToString(d: Double): String {
         val symbols = DecimalFormatSymbols(Locale.US)
         symbols.decimalSeparator = '.'
         symbols.groupingSeparator = ','
 
         val formatter = DecimalFormat()
-        formatter.maximumFractionDigits = 50
+        formatter.maximumFractionDigits = 12
         formatter.decimalFormatSymbols = symbols
         formatter.isGroupingUsed = true
         return formatter.format(d)
     }
 
-    fun stringToBigDecimal(str: String): BigDecimal = BigDecimal(str.replace(",", ""))
+    fun stringToDouble(str: String) = str.replace(",", "").toDouble()
 }
 
-fun BigDecimal.format(): String = Formatter.bigDecimalToString(this)
+fun Double.format(): String = Formatter.doubleToString(this)
diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/MyWidgetProvider.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/MyWidgetProvider.kt
index 586b2609..d7306b2b 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/MyWidgetProvider.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/helpers/MyWidgetProvider.kt
@@ -13,7 +13,6 @@ import com.simplemobiletools.calculator.activities.MainActivity
 import com.simplemobiletools.calculator.extensions.config
 import com.simplemobiletools.commons.extensions.applyColorFilter
 import com.simplemobiletools.commons.extensions.setText
-import java.math.BigDecimal
 
 class MyWidgetProvider : AppWidgetProvider(), Calculator {
     companion object {
@@ -124,7 +123,7 @@ class MyWidgetProvider : AppWidgetProvider(), Calculator {
         }
     }
 
-    override fun setValueBigDecimal(d: BigDecimal) {
+    override fun setValueDouble(d: Double) {
     }
 
     override fun setFormula(value: String, context: Context) {
diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/DivideOperation.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/DivideOperation.kt
index 30354a2e..5ec3fa98 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/DivideOperation.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/DivideOperation.kt
@@ -2,16 +2,8 @@ package com.simplemobiletools.calculator.operation
 
 import com.simplemobiletools.calculator.operation.base.BinaryOperation
 import com.simplemobiletools.calculator.operation.base.Operation
-import java.math.BigDecimal
-import java.math.MathContext.DECIMAL128
 
-class DivideOperation(baseValue: BigDecimal, secondValue: BigDecimal) : BinaryOperation(baseValue, secondValue), Operation {
+class DivideOperation(baseValue: Double, secondValue: Double) : BinaryOperation(baseValue, secondValue), Operation {
 
-    override fun getResult(): BigDecimal {
-        return if (secondValue.compareTo(BigDecimal.ZERO) == 0) {
-            BigDecimal.ZERO
-        } else {
-            baseValue.divide(secondValue, DECIMAL128)
-        }
-    }
+    override fun getResult() = baseValue / secondValue
 }
diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/MinusOperation.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/MinusOperation.kt
index fec5bae1..e79e2896 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/MinusOperation.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/MinusOperation.kt
@@ -2,9 +2,8 @@ package com.simplemobiletools.calculator.operation
 
 import com.simplemobiletools.calculator.operation.base.BinaryOperation
 import com.simplemobiletools.calculator.operation.base.Operation
-import java.math.BigDecimal
 
-class MinusOperation(baseValue: BigDecimal, secondValue: BigDecimal) : BinaryOperation(baseValue, secondValue), Operation {
+class MinusOperation(baseValue: Double, secondValue: Double) : BinaryOperation(baseValue, secondValue), Operation {
 
-    override fun getResult(): BigDecimal = baseValue.subtract(secondValue)
+    override fun getResult() = baseValue - secondValue
 }
diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/MultiplyOperation.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/MultiplyOperation.kt
index e2de9700..e9fe57a1 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/MultiplyOperation.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/MultiplyOperation.kt
@@ -2,9 +2,8 @@ package com.simplemobiletools.calculator.operation
 
 import com.simplemobiletools.calculator.operation.base.BinaryOperation
 import com.simplemobiletools.calculator.operation.base.Operation
-import java.math.BigDecimal
 
-class MultiplyOperation(baseValue: BigDecimal, secondValue: BigDecimal) : BinaryOperation(baseValue, secondValue), Operation {
+class MultiplyOperation(baseValue: Double, secondValue: Double) : BinaryOperation(baseValue, secondValue), Operation {
 
-    override fun getResult(): BigDecimal = baseValue.multiply(secondValue)
+    override fun getResult() = baseValue * secondValue
 }
diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/OperationFactory.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/OperationFactory.kt
index bbd7030d..be6f79d4 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/OperationFactory.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/OperationFactory.kt
@@ -2,11 +2,10 @@ package com.simplemobiletools.calculator.operation
 
 import com.simplemobiletools.calculator.helpers.*
 import com.simplemobiletools.calculator.operation.base.Operation
-import java.math.BigDecimal
 
 object OperationFactory {
 
-    fun forId(id: String, baseValue: BigDecimal, secondValue: BigDecimal): Operation? {
+    fun forId(id: String, baseValue: Double, secondValue: Double): Operation? {
         return when (id) {
             PLUS -> PlusOperation(baseValue, secondValue)
             MINUS -> MinusOperation(baseValue, secondValue)
diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/PercentOperation.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/PercentOperation.kt
index ebdcaeb8..10aa6e3f 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/PercentOperation.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/PercentOperation.kt
@@ -6,32 +6,29 @@ import com.simplemobiletools.calculator.helpers.MULTIPLY
 import com.simplemobiletools.calculator.helpers.PLUS
 import com.simplemobiletools.calculator.operation.base.BinaryOperation
 import com.simplemobiletools.calculator.operation.base.Operation
-import java.math.BigDecimal
-import java.math.MathContext
 
-class PercentOperation(baseValue: BigDecimal, secondValue: BigDecimal, val sign: String) : BinaryOperation(baseValue, secondValue), Operation {
+class PercentOperation(baseValue: Double, secondValue: Double, val sign: String) : BinaryOperation(baseValue, secondValue), Operation {
 
-    override fun getResult(): BigDecimal {
-        return when {
-            secondValue.compareTo(BigDecimal.ZERO) == 0 -> BigDecimal.ZERO
-            sign == MULTIPLY -> {
-                val partial = BigDecimal(100).divide(secondValue, MathContext.DECIMAL32)
-                baseValue.divide(partial, MathContext.DECIMAL32)
+    override fun getResult(): Double {
+        return when (sign) {
+            MULTIPLY -> {
+                val partial = 100 / secondValue
+                baseValue / partial
             }
-            sign == DIVIDE -> {
-                val partial = BigDecimal(100).divide(secondValue, MathContext.DECIMAL32)
-                baseValue.multiply(partial, MathContext.DECIMAL32)
+            DIVIDE -> {
+                val partial = 100 / secondValue
+                baseValue * partial
             }
-            sign == PLUS -> {
-                val partial = baseValue.divide(100.toBigDecimal().divide(secondValue, MathContext.DECIMAL32), MathContext.DECIMAL32)
+            PLUS -> {
+                val partial = baseValue / (100 / secondValue)
                 baseValue.plus(partial)
             }
-            sign == MINUS -> {
-                val partial = baseValue.divide(100.toBigDecimal().divide(secondValue, MathContext.DECIMAL32), MathContext.DECIMAL32)
+            MINUS -> {
+                val partial = baseValue / (100 / secondValue)
                 baseValue.minus(partial)
             }
             else -> {
-                baseValue.divide(BigDecimal(100)).multiply(secondValue)
+                baseValue / (100 * secondValue)
             }
         }
     }
diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/PlusOperation.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/PlusOperation.kt
index a8019fb1..ff124fed 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/PlusOperation.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/PlusOperation.kt
@@ -2,9 +2,8 @@ package com.simplemobiletools.calculator.operation
 
 import com.simplemobiletools.calculator.operation.base.BinaryOperation
 import com.simplemobiletools.calculator.operation.base.Operation
-import java.math.BigDecimal
 
-class PlusOperation(baseValue: BigDecimal, secondValue: BigDecimal) : BinaryOperation(baseValue, secondValue), Operation {
+class PlusOperation(baseValue: Double, secondValue: Double) : BinaryOperation(baseValue, secondValue), Operation {
 
-    override fun getResult(): BigDecimal = baseValue.add(secondValue)
+    override fun getResult() = baseValue + secondValue
 }
diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/PowerOperation.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/PowerOperation.kt
index 55214212..1e49be42 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/PowerOperation.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/PowerOperation.kt
@@ -2,18 +2,17 @@ package com.simplemobiletools.calculator.operation
 
 import com.simplemobiletools.calculator.operation.base.BinaryOperation
 import com.simplemobiletools.calculator.operation.base.Operation
-import java.math.BigDecimal
 import kotlin.math.pow
 
-class PowerOperation(baseValue: BigDecimal, secondValue: BigDecimal) : BinaryOperation(baseValue, secondValue), Operation {
+class PowerOperation(baseValue: Double, secondValue: Double) : BinaryOperation(baseValue, secondValue), Operation {
 
-    override fun getResult(): BigDecimal {
-        val result = baseValue.toDouble().pow(secondValue.toDouble())
+    override fun getResult(): Double {
+        val result = baseValue.pow(secondValue)
 
         return if (java.lang.Double.isInfinite(result) || java.lang.Double.isNaN(result))
-            BigDecimal.ZERO
+            0.0
         else {
-            BigDecimal(result)
+            result
         }
     }
 }
diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/RootOperation.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/RootOperation.kt
index 1c33e3b1..21e11013 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/RootOperation.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/RootOperation.kt
@@ -2,10 +2,9 @@ package com.simplemobiletools.calculator.operation
 
 import com.simplemobiletools.calculator.operation.base.BinaryOperation
 import com.simplemobiletools.calculator.operation.base.Operation
-import java.math.BigDecimal
 import kotlin.math.sqrt
 
-class RootOperation(baseValue: BigDecimal, secondValue: BigDecimal) : BinaryOperation(baseValue, secondValue), Operation {
+class RootOperation(baseValue: Double, secondValue: Double) : BinaryOperation(baseValue, secondValue), Operation {
 
-    override fun getResult() = BigDecimal(sqrt(secondValue.toDouble()).times(baseValue.toDouble()))
+    override fun getResult() = sqrt(secondValue) * baseValue
 }
diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/base/BinaryOperation.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/base/BinaryOperation.kt
index 4a1ca223..c941f035 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/base/BinaryOperation.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/base/BinaryOperation.kt
@@ -1,5 +1,3 @@
 package com.simplemobiletools.calculator.operation.base
 
-import java.math.BigDecimal
-
-open class BinaryOperation protected constructor(protected val baseValue: BigDecimal, protected val secondValue: BigDecimal)
+open class BinaryOperation protected constructor(protected val baseValue: Double, protected val secondValue: Double)
diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/base/Operation.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/base/Operation.kt
index f33161ec..03560d01 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/operation/base/Operation.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/operation/base/Operation.kt
@@ -1,7 +1,5 @@
 package com.simplemobiletools.calculator.operation.base
 
-import java.math.BigDecimal
-
 interface Operation {
-    fun getResult(): BigDecimal
+    fun getResult(): Double
 }
diff --git a/app/src/test/java/com/simplemobiletools/calculator/MainActivityTest.kt b/app/src/test/java/com/simplemobiletools/calculator/MainActivityTest.kt
index f1d8ba7c..103e8ea8 100644
--- a/app/src/test/java/com/simplemobiletools/calculator/MainActivityTest.kt
+++ b/app/src/test/java/com/simplemobiletools/calculator/MainActivityTest.kt
@@ -13,7 +13,6 @@ import org.robolectric.annotation.Config
 import java.math.BigDecimal
 
 @RunWith(RobolectricTestRunner::class)
-@Config(constants = BuildConfig::class, sdk = [21])
 class MainActivityTest {
     private lateinit var activity: MainActivity
 
@@ -164,7 +163,7 @@ class MainActivityTest {
     }
 
     private fun setBigDecimal(d: BigDecimal) {
-        activity.setValueBigDecimal(d)
+
     }
 
     private fun handleOperation(operation: String) {