A funnel chart visualizes sequential stages of a process where values progressively decrease from one stage to the next. Each stage is represented as a trapezoidal segment that narrows from top to bottom, making it easy to identify drop-offs between stages. This chart is ideal for tracking conversion rates, sales pipelines, and multi-step processes where understanding stage-to-stage transitions is critical.
""" anyplot.ai
funnel-basic: Basic Funnel Chart
Library: bokeh 3.9.0 | Python 3.14.4
Quality: 86/100 | Updated: 2026-04-26
"""
from bokeh.io import export_png, output_file, save
from bokeh.models import Label, Legend, LegendItem
from bokeh.plotting import figure
# Data - Sales funnel stages (from spec example)
stages = ["Awareness", "Interest", "Consideration", "Intent", "Purchase"]
values = [1000, 600, 400, 200, 100]
# Colors - distinct for each stage (Python Blue first, then colorblind-safe palette)
colors = ["#306998", "#FFD43B", "#E74C3C", "#9B59B6", "#27AE60"]
# Calculate widths proportional to values (relative to first/largest value)
max_value = values[0]
widths = [v / max_value for v in values]
# Funnel parameters
funnel_height = 2.0 # Total height of funnel
stage_height = funnel_height / len(stages)
center_x = 0.5 # Center of funnel
# Build funnel segments as patches (trapezoids)
# Each segment connects the width at its top to the width at its bottom
segment_coords = []
for i in range(len(stages)):
top_width = widths[i]
# Bottom width is next stage width, or 50% of current for last stage
bottom_width = widths[i + 1] if i < len(stages) - 1 else widths[i] * 0.5
top_y = funnel_height - i * stage_height
bottom_y = top_y - stage_height
# Trapezoid coordinates (clockwise from top-left)
xs = [
center_x - top_width / 2, # top-left
center_x + top_width / 2, # top-right
center_x + bottom_width / 2, # bottom-right
center_x - bottom_width / 2, # bottom-left
]
ys = [top_y, top_y, bottom_y, bottom_y]
segment_coords.append((xs, ys))
# Create figure (4800 x 2700 px)
p = figure(
width=4800,
height=2700,
title="funnel-basic · bokeh · pyplots.ai",
x_range=(-0.3, 1.3),
y_range=(-0.3, 2.3),
tools="",
toolbar_location=None,
)
# Draw funnel segments and collect renderers for legend
renderers = []
for (xs, ys), color in zip(segment_coords, colors, strict=True):
r = p.patch(xs, ys, fill_color=color, line_color="white", line_width=4, alpha=0.9)
renderers.append(r)
# Add labels on each segment (stage name and value/percentage)
for i, (stage, value) in enumerate(zip(stages, values, strict=True)):
xs, ys = segment_coords[i]
# Label position: center of trapezoid
center_y = (ys[0] + ys[2]) / 2
# Calculate percentage relative to first stage
percentage = (value / max_value) * 100
# Stage name label (dark text for yellow, white for others)
text_color = "#333333" if colors[i] == "#FFD43B" else "white"
stage_label = Label(
x=center_x,
y=center_y + 0.06,
text=stage,
text_font_size="28pt",
text_font_style="bold",
text_color=text_color,
text_align="center",
text_baseline="middle",
)
p.add_layout(stage_label)
# Value label
value_label = Label(
x=center_x,
y=center_y - 0.06,
text=f"{value:,} ({percentage:.0f}%)",
text_font_size="22pt",
text_color=text_color,
text_align="center",
text_baseline="middle",
)
p.add_layout(value_label)
# Create legend
legend_items = [LegendItem(label=f"{stages[i]}: {values[i]:,}", renderers=[renderers[i]]) for i in range(len(stages))]
legend = Legend(
items=legend_items,
location="center_right",
label_text_font_size="24pt",
glyph_width=40,
glyph_height=40,
spacing=20,
padding=30,
background_fill_alpha=0.9,
border_line_color="#cccccc",
)
p.add_layout(legend, "right")
# Styling
p.title.text_font_size = "36pt"
p.title.align = "center"
# Hide axes and grid for funnel chart
p.axis.visible = False
p.grid.visible = False
p.outline_line_color = None
# Save outputs
export_png(p, filename="plot.png")
# Also save interactive HTML
output_file("plot.html")
save(p)
Part of Basic Funnel Chart on anyplot.ai.