Display a numeric input widget.


Integer values exceeding +/- (1<<53) - 1 cannot be accurately stored or returned by the widget due to serialization contstraints between the Python server and JavaScript client. You must handle such numbers as floats, leading to a loss in precision.

Function signature[source]

st.number_input(label, min_value=None, max_value=None, value="min", step=None, format=None, key=None, help=None, on_change=None, args=None, kwargs=None, *, placeholder=None, disabled=False, label_visibility="visible")


label (str)

A short label explaining to the user what this input is for. The label can optionally contain Markdown and supports the following elements: Bold, Italics, Strikethroughs, Inline Code, Emojis, and Links.

This also supports:

  • Emoji shortcodes, such as :+1: and :sunglasses:. For a list of all supported codes, see https://share.streamlit.io/streamlit/emoji-shortcodes.
  • LaTeX expressions, by wrapping them in "$" or "$$" (the "$$" must be on their own lines). Supported LaTeX functions are listed at https://katex.org/docs/supported.html.
  • Colored text and background colors for text, using the syntax :color[text to be colored] and :color-background[text to be colored], respectively. color must be replaced with any of the following supported colors: blue, green, orange, red, violet, gray/grey, rainbow. For example, you can use :orange[your text here] or :blue-background[your text here].

Unsupported elements are unwrapped so only their children (text contents) render. Display unsupported elements as literal characters by backslash-escaping them. E.g. 1\. Not an ordered list.

For accessibility reasons, you should never set an empty label (label="") but hide it with label_visibility if needed. In the future, we may disallow empty labels by raising an exception.

min_value (int, float, or None)

The minimum permitted value. If None, there will be no minimum.

max_value (int, float, or None)

The maximum permitted value. If None, there will be no maximum.

value (int, float, "min" or None)

The value of this widget when it first renders. If None, will initialize empty and return None until the user provides input. If "min" (default), will initialize with min_value, or 0.0 if min_value is None.

step (int, float, or None)

The stepping interval. Defaults to 1 if the value is an int, 0.01 otherwise. If the value is not specified, the format parameter will be used.

format (str or None)

A printf-style format string controlling how the interface should display numbers. Output must be purely numeric. This does not impact the return value. Valid formatters: %d %e %f %g %i %u

key (str or int)

An optional string or integer to use as the unique key for the widget. If this is omitted, a key will be generated for the widget based on its content. Multiple widgets of the same type may not share the same key.

help (str)

An optional tooltip that gets displayed next to the input.

on_change (callable)

An optional callback invoked when this number_input's value changes.

args (tuple)

An optional tuple of args to pass to the callback.

kwargs (dict)

An optional dict of kwargs to pass to the callback.

placeholder (str or None)

An optional string displayed when the number input is empty. If None, no placeholder is displayed.

disabled (bool)

An optional boolean, which disables the number input if set to True. The default is False.

label_visibility ("visible", "hidden", or "collapsed")

The visibility of the label. If "hidden", the label doesn't show but there is still empty space for it above the widget (equivalent to label=""). If "collapsed", both the label and the space are removed. Default is "visible".


(int or float or None)

The current value of the numeric input widget or None if the widget is empty. The return type will match the data type of the value parameter.


import streamlit as st

number = st.number_input("Insert a number")
st.write("The current number is ", number)

To initialize an empty number input, use None as the value:

import streamlit as st

number = st.number_input("Insert a number", value=None, placeholder="Type a number...")
st.write("The current number is ", number)

Still have questions?

Our forums are full of helpful information and Streamlit experts.