.. only:: html .. note:: :class: sphx-glr-download-link-note Click :ref:`here ` to download the full example code .. rst-class:: sphx-glr-example-title .. _sphx_glr_gallery_subplots_axes_and_figures_figure_size_units.py: ============================== Figure size in different units ============================== The native figure size unit in Matplotlib is inches, deriving from print industry standards. However, users may need to specify their figures in other units like centimeters or pixels. This example illustrates how to do this efficiently. .. code-block:: default import matplotlib.pyplot as plt text_kwargs = dict(ha='center', va='center', fontsize=28, color='C1') Figure size in inches (default) ------------------------------- .. code-block:: default plt.subplots(figsize=(6, 2)) plt.text(0.5, 0.5, '6 inches x 2 inches', **text_kwargs) plt.show() .. image:: /gallery/subplots_axes_and_figures/images/sphx_glr_figure_size_units_001.png :alt: figure size units :class: sphx-glr-single-img Figure size in centimeter ------------------------- Multiplying centimeter-based numbers with a conversion factor from cm to inches, gives the right numbers. Naming the conversion factor ``cm`` makes the conversion almost look like appending a unit to the number, which is nicely readable. .. code-block:: default cm = 1/2.54 # centimeters in inches plt.subplots(figsize=(15*cm, 5*cm)) plt.text(0.5, 0.5, '15cm x 5cm', **text_kwargs) plt.show() .. image:: /gallery/subplots_axes_and_figures/images/sphx_glr_figure_size_units_002.png :alt: figure size units :class: sphx-glr-single-img Figure size in pixel -------------------- Similarly, one can use a conversion from pixels. Note that you could break this if you use `~.pyplot.savefig` with a different explicit dpi value. .. code-block:: default px = 1/plt.rcParams['figure.dpi'] # pixel in inches plt.subplots(figsize=(600*px, 200*px)) plt.text(0.5, 0.5, '600px x 200px', **text_kwargs) plt.show() .. image:: /gallery/subplots_axes_and_figures/images/sphx_glr_figure_size_units_003.png :alt: figure size units :class: sphx-glr-single-img Quick interactive work is usually rendered to the screen, making pixels a good size of unit. But defining the conversion factor may feel a little tedious for quick iterations. Because of the default ``rcParams['figure.dpi'] = 100``, one can mentally divide the needed pixel value by 100 [*]_: .. code-block:: default plt.subplots(figsize=(6, 2)) plt.text(0.5, 0.5, '600px x 200px', **text_kwargs) plt.show() .. image:: /gallery/subplots_axes_and_figures/images/sphx_glr_figure_size_units_004.png :alt: figure size units :class: sphx-glr-single-img .. [*] Unfortunately, this does not work well for the ``matplotlib inline`` backend in jupyter because that backend uses a different default of ``rcParams['figure.dpi'] = 72``. Additionally, it saves the figure with ``bbox_inches='tight'``, which crops the figure and makes the actual size unpredictable. ------------ References """""""""" The use of the following functions and methods is shown in this example: .. code-block:: default import matplotlib matplotlib.pyplot.figure matplotlib.pyplot.subplots matplotlib.pyplot.subplot_mosaic .. rst-class:: sphx-glr-script-out Out: .. code-block:: none .. _sphx_glr_download_gallery_subplots_axes_and_figures_figure_size_units.py: .. only :: html .. container:: sphx-glr-footer :class: sphx-glr-footer-example .. container:: sphx-glr-download sphx-glr-download-python :download:`Download Python source code: figure_size_units.py ` .. container:: sphx-glr-download sphx-glr-download-jupyter :download:`Download Jupyter notebook: figure_size_units.ipynb ` .. only:: html .. rst-class:: sphx-glr-signature Keywords: matplotlib code example, codex, python plot, pyplot `Gallery generated by Sphinx-Gallery `_