diff --git a/app/src/main/res/values-es/strings.xml b/app/src/main/res/values-es/strings.xml
index f08344ae..643c0d70 100644
--- a/app/src/main/res/values-es/strings.xml
+++ b/app/src/main/res/values-es/strings.xml
@@ -3,8 +3,8 @@
     <string name="app_name">Simple Calculator</string>
     <string name="app_launcher_name">Calculadora</string>
     <string name="scientific_calculator">Calculadora científica</string>
-    <string name="unit_converter">Unit converter</string>
-    <string name="swap_units">Swap units</string>
+    <string name="unit_converter">Conversor de unidades</string>
+    <string name="swap_units">Cambiar unidades</string>
     <!-- Calculator field -->
     <string name="formula_divide_by_zero_error">Error: división por cero</string>
     <!-- History -->
@@ -16,86 +16,86 @@
     <string name="vibrate_on_button_press">Vibrar al presionar un botón</string>
     <string name="use_comma_as_decimal_mark">Usar una coma como marca decimal</string>
     <!-- Unit converter -->
-    <string name="unit_length">Length</string>
-    <string name="unit_length_kilometer">Kilometer</string>
-    <string name="unit_length_meter">Meter</string>
-    <string name="unit_length_centimeter">Centimeter</string>
-    <string name="unit_length_millimeter">Millimeter</string>
-    <string name="unit_length_micrometer">Micrometer</string>
-    <string name="unit_length_nanometer">Nanometer</string>
-    <string name="unit_length_angstrom">Angstrom</string>
+    <string name="unit_length">Longitud</string>
+    <string name="unit_length_kilometer">Kilómetros</string>
+    <string name="unit_length_meter">Metro</string>
+    <string name="unit_length_centimeter">Centímetro</string>
+    <string name="unit_length_millimeter">Milímetro</string>
+    <string name="unit_length_micrometer">Micrómetro</string>
+    <string name="unit_length_nanometer">Nanómetro</string>
+    <string name="unit_length_angstrom">Ángstrom</string>
     <string name="unit_length_mile">Mile</string>
     <string name="unit_length_yard">Yard</string>
-    <string name="unit_length_foot">Foot</string>
-    <string name="unit_length_inch">Inch</string>
-    <string name="unit_length_fathom">Fathom</string>
-    <string name="unit_length_nautical_mile">Nautical Mile</string>
-    <string name="unit_length_astronomical_unit">Astronomical Unit</string>
-    <string name="unit_length_parsec">Parsec</string>
-    <string name="unit_length_light_year">Light Year</string>
+    <string name="unit_length_foot">Pie</string>
+    <string name="unit_length_inch">Pulgada</string>
+    <string name="unit_length_fathom">Braza inglesa</string>
+    <string name="unit_length_nautical_mile">Millas Náuticas</string>
+    <string name="unit_length_astronomical_unit">Unidad astronómica</string>
+    <string name="unit_length_parsec">Pársec</string>
+    <string name="unit_length_light_year">Año Luz</string>
     <string name="unit_area">Area</string>
-    <string name="unit_area_square_kilometer">Square Kilometer</string>
-    <string name="unit_area_square_meter">Square Meter</string>
-    <string name="unit_area_square_centimeter">Square Centimeter</string>
-    <string name="unit_area_square_millimeter">Square Millimeter</string>
-    <string name="unit_area_square_mile">Square Mile</string>
-    <string name="unit_area_square_yard">Square Yard</string>
-    <string name="unit_area_square_foot">Square Foot</string>
-    <string name="unit_area_square_inch">Square Inch</string>
+    <string name="unit_area_square_kilometer">Kilómetro cuadrado</string>
+    <string name="unit_area_square_meter">Metro cuadrado</string>
+    <string name="unit_area_square_centimeter">Centímetro cuadrado</string>
+    <string name="unit_area_square_millimeter">Milímetro cuadrado</string>
+    <string name="unit_area_square_mile">Milla cuadrada</string>
+    <string name="unit_area_square_yard">Yarda cuadrada</string>
+    <string name="unit_area_square_foot">Pie cuadrado</string>
+    <string name="unit_area_square_inch">Pulgada cuadrada</string>
     <string name="unit_area_acre">Acre</string>
-    <string name="unit_area_hectare">Hectare</string>
+    <string name="unit_area_hectare">Hectárea</string>
     <string name="unit_volume">Volume</string>
-    <string name="unit_volume_cubic_meter">Cubic Meter</string>
-    <string name="unit_volume_cubic_decimeter">Cubic Decimeter</string>
-    <string name="unit_volume_cubic_centimeter">Cubic Centimeter</string>
-    <string name="unit_volume_cubic_millimeter">Cubic Millimeter</string>
-    <string name="unit_volume_liter">Liter</string>
-    <string name="unit_volume_centiliter">Centiliter</string>
-    <string name="unit_volume_deciliter">Deciliter</string>
-    <string name="unit_volume_milliliter">Milliliter</string>
-    <string name="unit_volume_acre_foot">Acre Foot</string>
-    <string name="unit_volume_cubic_foot">Cubic Foot</string>
-    <string name="unit_volume_cubic_inch">Cubic Inch</string>
-    <string name="unit_volume_barrel_us">Barrel (US)</string>
-    <string name="unit_volume_gallon_us">Gallon (US)</string>
-    <string name="unit_volume_quart_us">Quart (US)</string>
-    <string name="unit_volume_pint_us">Pint (US)</string>
-    <string name="unit_volume_gill_us">Gill (US)</string>
-    <string name="unit_volume_fluid_ounce_us">Fluid Ounce (US)</string>
-    <string name="unit_volume_barrel_imperial">Barrel (Imperial)</string>
-    <string name="unit_volume_gallon_imperial">Gallon (Imperial)</string>
-    <string name="unit_volume_quart_imperial">Quart (Imperial)</string>
-    <string name="unit_volume_pint_imperial">Pint (Imperial)</string>
+    <string name="unit_volume_cubic_meter">Metro cúbico</string>
+    <string name="unit_volume_cubic_decimeter">Decímetro cúbico</string>
+    <string name="unit_volume_cubic_centimeter">Centímetro cúbico</string>
+    <string name="unit_volume_cubic_millimeter">Milímetro cúbico</string>
+    <string name="unit_volume_liter">Litro</string>
+    <string name="unit_volume_centiliter">Centilitro</string>
+    <string name="unit_volume_deciliter">Decilitro</string>
+    <string name="unit_volume_milliliter">Mililitro</string>
+    <string name="unit_volume_acre_foot">Acres</string>
+    <string name="unit_volume_cubic_foot">Pie cúbico</string>
+    <string name="unit_volume_cubic_inch">Pulgada cúbica</string>
+    <string name="unit_volume_barrel_us">Barril (EE.UU.)</string>
+    <string name="unit_volume_gallon_us">Galón (EE.UU.)</string>
+    <string name="unit_volume_quart_us">Cuarto de galón (EE.UU.)</string>
+    <string name="unit_volume_pint_us">Pinta (EE.UU.)</string>
+    <string name="unit_volume_gill_us">Gill (EE.UU.)</string>
+    <string name="unit_volume_fluid_ounce_us">Onza líquida (EE.UU.)</string>
+    <string name="unit_volume_barrel_imperial">Barril (Imperial)</string>
+    <string name="unit_volume_gallon_imperial">Galón (Imperial)</string>
+    <string name="unit_volume_quart_imperial">Cuarto de galón (Imperial)</string>
+    <string name="unit_volume_pint_imperial">Pinta (Imperial)</string>
     <string name="unit_volume_gill_imperial">Gill (Imperial)</string>
-    <string name="unit_volume_fluid_ounce_imperial">Fluid Ounce (Imperial)</string>
-    <string name="unit_mass">Mass</string>
-    <string name="unit_mass_gram">Gram</string>
-    <string name="unit_mass_kilogram">Kilogram</string>
-    <string name="unit_mass_milligram">Milligram</string>
-    <string name="unit_mass_microgram">Microgram</string>
-    <string name="unit_mass_tonne">Tonne</string>
+    <string name="unit_volume_fluid_ounce_imperial">Onza líquida (Imperial)</string>
+    <string name="unit_mass">Masa</string>
+    <string name="unit_mass_gram">Gramo</string>
+    <string name="unit_mass_kilogram">Kilogramo</string>
+    <string name="unit_mass_milligram">Miligramo</string>
+    <string name="unit_mass_microgram">Microgramo</string>
+    <string name="unit_mass_tonne">Tonelada</string>
     <string name="unit_mass_pound">Pound</string>
-    <string name="unit_mass_ounce">Ounce</string>
-    <string name="unit_mass_grain">Grain</string>
+    <string name="unit_mass_ounce">Onza</string>
+    <string name="unit_mass_grain">Grano</string>
     <string name="unit_mass_dram">Dram</string>
-    <string name="unit_mass_stone">Stone</string>
-    <string name="unit_mass_long_ton">Long Ton</string>
-    <string name="unit_mass_short_ton">Short Ton</string>
-    <string name="unit_mass_carat">Carat</string>
-    <string name="unit_mass_carat_metric">Carat (Metric)</string>
-    <string name="unit_temperature">Temperature</string>
+    <string name="unit_mass_stone">Piedra</string>
+    <string name="unit_mass_long_ton">Tonelada larga</string>
+    <string name="unit_mass_short_ton">Tonelada corta</string>
+    <string name="unit_mass_carat">Quilate</string>
+    <string name="unit_mass_carat_metric">Quilate (sistema métrico)</string>
+    <string name="unit_temperature">Temperatura</string>
     <string name="unit_temperature_celsius">Celsius</string>
     <string name="unit_temperature_fahrenheit">Fahrenheit</string>
     <string name="unit_temperature_rankine">Rankine</string>
     <string name="unit_temperature_kelvin">Kelvin</string>
-    <string name="unit_time">Time</string>
-    <string name="unit_time_hour">Hour</string>
+    <string name="unit_time">Tiempo</string>
+    <string name="unit_time_hour">Hora</string>
     <string name="unit_time_minute">Minute</string>
-    <string name="unit_time_second">Second</string>
-    <string name="unit_time_millisecond">Microsecond</string>
+    <string name="unit_time_second">Segundo</string>
+    <string name="unit_time_millisecond">Microsegundo</string>
     <string name="unit_time_day">Day</string>
-    <string name="unit_time_week">Week</string>
-    <string name="unit_time_year">Year</string>
+    <string name="unit_time_week">Semana</string>
+    <string name="unit_time_year">Año</string>
     <!-- FAQ -->
     <string name="faq_1_title">¿Cómo funciona el botón C (Borrar)\?</string>
     <string name="faq_1_text">Presionándolo una vez eliminará un solo carácter. Mantenerlo presionado reiniciará todos los campos.</string>
@@ -103,4 +103,4 @@
         Haven't found some strings? There's more at
         https://github.com/SimpleMobileTools/Simple-Commons/tree/master/commons/src/main/res
     -->
-</resources>
+</resources>
\ No newline at end of file