diff --git a/AUTHORS.md b/AUTHORS.md
index 1b80c6ff..5aa5cfb0 100644
--- a/AUTHORS.md
+++ b/AUTHORS.md
@@ -27,5 +27,7 @@ This file contains a list of all the authors of widgets in this repository. Plea
   * `AutocompleteEntryListbox`
 - [Dogeek](https://github.com/Dogeek)
   * `validated_entries` submodule
+- [rdbende](https://github.com/rdbende)
+  * `NumberEntry`
 - Multiple authors:
   * `ScaleEntry` (RedFantom and Juliette Monsel)
diff --git a/README.md b/README.md
index 0e4047c8..01b0e3b2 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@ A collection of widgets for Tkinter's ttk extensions by various authors.
     Copyright (C) Mitja Martini 2008
     Copyright (C) Russell Adams 2011
     Copyright (C) Juliette Monsel 2017
+    Copyright (C) rdbende 2021
     
     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
diff --git a/docs/source/ttkwidgets/ttkwidgets.rst b/docs/source/ttkwidgets/ttkwidgets.rst
index 21543502..65bef4a9 100644
--- a/docs/source/ttkwidgets/ttkwidgets.rst
+++ b/docs/source/ttkwidgets/ttkwidgets.rst
@@ -17,6 +17,7 @@ ttkwidgets
     DebugWindow
     ItemsCanvas
     LinkLabel
+    NumberEntry
     ScaleEntry
     ScrolledListbox
     Table
diff --git a/examples/example_numberentry.py b/examples/example_numberentry.py
new file mode 100644
index 00000000..5df92370
--- /dev/null
+++ b/examples/example_numberentry.py
@@ -0,0 +1,14 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (c) rdbende 2021
+# For license see LICENSE
+
+from ttkwidgets import NumberEntry
+import tkinter as tk
+
+root = tk.Tk()
+root.title('NumberEntry')
+
+NumberEntry(root, expressions=True, roundto=4, allowed_chars={'p': 3.14159, 'x': 5}).pack(pady=30)
+
+root.mainloop()
diff --git a/tests/test_numberentry.py b/tests/test_numberentry.py
new file mode 100644
index 00000000..07195643
--- /dev/null
+++ b/tests/test_numberentry.py
@@ -0,0 +1,39 @@
+# Copyright (c) rdbende 2021
+# For license see LICENSE
+
+from ttkwidgets import NumberEntry
+from tests import BaseWidgetTest
+import tkinter as tk
+
+
+class TestNumberEntry(BaseWidgetTest):
+    def test_numberentry_init(self):
+        entry = NumberEntry(self.window, roundto=4, allowed_chars={'p': 3.14})
+        entry.pack()
+        self.window.update()
+
+    def test_numberentry_events(self):
+        entry = NumberEntry(self.window, roundto=4, allowed_chars={'p': 3.14})
+        entry.pack()
+        self.window.update()
+        entry.insert(0, "1+2-3*4/5**p")
+        self.window.update()
+        entry._check()
+        self.window.update()
+        entry._eval()
+        self.window.update()
+
+    def test_numberentry_config(self):
+        entry = NumberEntry(self.window, roundto=4, allowed_chars={'p': 3.14})
+        entry.pack()
+        self.window.update()
+        entry.keys()
+        self.window.update()
+        entry.configure(expressions=False, roundto=0)
+        self.window.update()
+        entry.cget("expressions")
+        self.window.update()
+        value = entry["roundto"]
+        self.window.update()
+        entry["allowed_chars"] = {'p': 3.14159}
+        self.window.update()
diff --git a/ttkwidgets/__init__.py b/ttkwidgets/__init__.py
index 2360b89c..f8d9f0f7 100644
--- a/ttkwidgets/__init__.py
+++ b/ttkwidgets/__init__.py
@@ -11,6 +11,7 @@
 from ttkwidgets.timeline import TimeLine
 from ttkwidgets.tickscale import TickScale
 from ttkwidgets.table import Table
+from ttkwidgets.numberentry import NumberEntry
 
 from ttkwidgets.validated_entries.numbers import (
     PercentEntry, IntEntry, FloatEntry,
diff --git a/ttkwidgets/numberentry.py b/ttkwidgets/numberentry.py
new file mode 100644
index 00000000..32783e51
--- /dev/null
+++ b/ttkwidgets/numberentry.py
@@ -0,0 +1,114 @@
+"""
+Author: rdbende
+License: GNU GPLv3
+Copyright (c) 2021 rdbende
+"""
+
+import tkinter as tk
+from tkinter import ttk
+
+
+class NumberEntry(ttk.Entry):
+    """
+    An entry that takes only numbers, calculations or variables,
+    and calculates the result of the calculation
+    """
+    def __init__(self, master=None, allowed_chars={}, **kwargs):
+        """
+        Create a NumberEntry
+        
+        :param allowed_chars: Set the accepted variables, the name must be one single character
+            e.g.: allowed_chars={'p': 3.14}
+        :type allowed_chars: dict
+        :param expressions: Allow the use of expressions (default is True)
+        :type expressions: bool
+        :param roundto: The number of decimals in the result (default is 0)
+        :type roundto: int
+        :param variables: Allow the use of the user specified variables
+            specified in allowed_chars (default is True)
+        :type variables: bool
+        """
+        self._allowed = allowed_chars
+        self._expr = kwargs.pop("expressions", True)
+        self._round = kwargs.pop("roundto", 0)
+        self._vars = kwargs.pop("variables", True)
+        ttk.Entry.__init__(self, master, **kwargs)
+        self.bind("<Return>", self._eval)
+        self.bind("<FocusOut>", self._eval)
+        self.bind("<KeyRelease>", self._check)
+        
+    def __getitem__(self, key):
+        return self.cget(key)
+
+    def __setitem__(self, key, value):
+        self.configure(**{key: value})
+    
+    def _eval(self, *args):
+        """Calculate the result of the entered calculation"""
+        current = self.get()
+        for i in current:
+            if i in self._allowed.keys():
+                current = current.replace(i, str(self._allowed[i]))
+        if current:
+            try:
+                if int(self._round) == 0:
+                    result = int(round(eval(current), 0))
+                    self.delete(0, tk.END)
+                    self.insert(0, result)         
+                else:
+                    result = round(float(eval(current)), self._round)
+                    self.delete(0, tk.END)
+                    self.insert(0, result)
+            except SyntaxError:
+                self.delete(0, tk.END)
+                self.insert(0, "SyntaxError")
+                self.select_range(0, tk.END)
+            except ZeroDivisionError:
+                self.delete(0, tk.END)
+                self.insert(0, "ZeroDivisionError")
+                self.select_range(0, tk.END)
+      
+    def _check(self, *args):
+        typed = self.get()
+        if not typed == "SyntaxError" and not typed == "ZeroDivisionError":
+            if self._expr:
+                allowed = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "+", "-", "*", "/", "%", "."]
+            else:
+                allowed = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "."]
+            if self._vars:
+                allowed.extend(self._allowed.keys())
+            for current in typed:
+                if not current in allowed:
+                    typed = typed.replace(current, "")
+            self.delete(0, tk.END)
+            self.insert(0, typed)
+
+    def configure(self, allowed_chars={}, **kwargs):
+        """Configure resources of the widget"""
+        self._allowed = allowed_chars
+        self._expr = kwargs.pop("expressions", self._expr)
+        self._round = kwargs.pop("roundto", self._round)
+        self._vars = kwargs.pop("variables", self._vars)
+        ttk.Entry.configure(self, **kwargs)
+
+    config = configure
+    
+    def cget(self, key):
+        """Return the resource value for a KEY given as string"""
+        if key == "allowed_chars":
+            return self._allowed
+        elif key == "expressions":
+            return self._expr
+        elif key == "roundto":
+            return self._round
+        elif key == "variables":
+            return self._vars        
+        else:
+            return ttk.Entry.cget(self, key)
+        
+    def keys(self):
+        """Return a list of all resource names of this widget"""
+        keys = ttk.Entry.keys(self)
+        keys.extend(["allowed_chars", "expressions", "roundto", "variables"])
+        keys.sort()
+        return keys