diff --git a/python/plugins/processing/algs/grass7/description/r.mapcalc.simple.txt b/python/plugins/processing/algs/grass7/description/r.mapcalc.simple.txt
new file mode 100644
index 00000000000..ad233ab0553
--- /dev/null
+++ b/python/plugins/processing/algs/grass7/description/r.mapcalc.simple.txt
@@ -0,0 +1,11 @@
+r.mapcalc.simple
+Calculate new raster map from a r.mapcalc expression.
+Raster (r.*)
+QgsProcessingParameterRasterLayer|a|Raster layer A|False
+QgsProcessingParameterRasterLayer|b|Raster layer B|True
+QgsProcessingParameterRasterLayer|c|Raster layer C|True
+QgsProcessingParameterRasterLayer|d|Raster layer D|True
+QgsProcessingParameterRasterLayer|e|Raster layer E|True
+QgsProcessingParameterRasterLayer|f|Raster layer F|True
+QgsProcessingParameterString|expression|Formula|A*2
+QgsProcessingParameterRasterDestination|output|Calculated
diff --git a/python/plugins/processing/algs/grass7/description/r.mapcalc.txt b/python/plugins/processing/algs/grass7/description/r.mapcalc.txt
deleted file mode 100644
index 06751ab650f..00000000000
--- a/python/plugins/processing/algs/grass7/description/r.mapcalc.txt
+++ /dev/null
@@ -1,9 +0,0 @@
-r.mapcalc
-Raster map calculator.
-Raster (r.*)
-QgsProcessingParameterMultipleLayers|maps|Raster maps used in the calculator|3|None|True
-QgsProcessingParameterString|expression|Expression to evaluate. Syntax e.g. `raster_out=raster1+raster2`. Use original filenames, without extension|None|True|True
-QgsProcessingParameterFile|file|File containing expression(s) to evaluate (same rule for raster names than above)|QgsProcessingParameterFile.File|txt|None|True
-QgsProcessingParameterString|seed|Integer seed for rand() function|None|False|True
-*QgsProcessingParameterBoolean|-s|Generate random seed (result is non-deterministic)|False
-QgsProcessingParameterFolderDestination|output_dir|Results Directory
diff --git a/python/plugins/processing/algs/grass7/ext/r_mapcalc.py b/python/plugins/processing/algs/grass7/ext/r_mapcalc.py
deleted file mode 100644
index 9df6f4edd69..00000000000
--- a/python/plugins/processing/algs/grass7/ext/r_mapcalc.py
+++ /dev/null
@@ -1,65 +0,0 @@
-# -*- coding: utf-8 -*-
-
-"""
-***************************************************************************
-    r_mapcalc.py
-    ------------
-    Date                 : February 2016
-    Copyright            : (C) 2016 by Médéric Ribreux
-    Email                : medspx at medspx dot fr
-***************************************************************************
-*                                                                         *
-*   This program is free software; you can redistribute it and/or modify  *
-*   it under the terms of the GNU General Public License as published by  *
-*   the Free Software Foundation; either version 2 of the License, or     *
-*   (at your option) any later version.                                   *
-*                                                                         *
-***************************************************************************
-"""
-
-__author__ = 'Médéric Ribreux'
-__date__ = 'February 2016'
-__copyright__ = '(C) 2016, Médéric Ribreux'
-
-# This will get replaced with a git SHA1 when you do a git archive
-
-__revision__ = '$Format:%H$'
-
-import os
-
-
-def checkParameterValuesBeforeExecuting(alg, parameters, context):
-    """ Verify if we have the right parameters """
-    if (alg.parameterAsString(parameters, 'expression', context)
-            and alg.parameterAsString(parameters, 'file', context)):
-        return False, alg.tr("You need to set either inline expression or a rules file!")
-
-    return True, None
-
-
-def processInputs(alg, parameters, context, feedback):
-    # We will use the same raster names than in QGIS to name the rasters in GRASS
-    rasters = alg.parameterAsLayerList(parameters, 'maps', context)
-    for idx, raster in enumerate(rasters):
-        rasterName = os.path.splitext(
-            os.path.basename(raster.source()))[0]
-        alg.inputLayers.append(raster)
-        alg.setSessionProjectionFromLayer(raster)
-        command = 'r.in.gdal input="{0}" output="{1}" --overwrite -o'.format(
-            os.path.normpath(raster.source()),
-            rasterName)
-        alg.commands.append(command)
-
-    alg.removeParameter('maps')
-    alg.postInputs()
-
-
-def processCommand(alg, parameters, context, feedback):
-    alg.processCommand(parameters, context, feedback, True)
-
-
-def processOutputs(alg, parameters, context, feedback):
-    # We need to export every raster from the GRASSDB
-    alg.exportRasterLayersIntoDirectory('output_dir',
-                                        parameters, context,
-                                        wholeDB=True)