GitHub-Style Layout
Display a full year of data as a grid of day cells, grouped by week and labeled by month — instantly recognizable to any audience.
Chart & Visualization Tools
Calendar Heatmap Maker
Paste your date-value data and watch it transform into a color-coded calendar heatmap. Perfect for tracking habits, commits, sales, or any daily metric.
Features
Everything You Need in a Calendar Heatmap Tool
Flexible controls that keep your focus on the data story, not the settings.
Custom Color Palettes
Choose from green, blue, orange, purple, or red intensity scales to match your brand or highlight specific patterns.
Adjustable Cell Size & Spacing
Fine-tune cell size, corner radius, and gap to create a compact summary or a spacious feature-ready visual.
Month and Day Labels
Toggle month and weekday labels on or off to keep the chart clean for any presentation context.
Hover Tooltips
Enable interactive tooltips so viewers can hover over any cell to see the exact date and value at a glance.
Color Legend
Display a 'Less → More' legend below the heatmap so readers always understand what each shade represents.
Data input
Get Your Data In — Your Way
Type or Paste
Enter date-value pairs by hand or paste directly from a spreadsheet in seconds.
Bulk Import
Paste a list of dates and values all at once using the bulk input field.
AI Generation
Describe your dataset in plain language and let AI populate a realistic calendar heatmap for you.
CSV Upload (Pro)
Upload a CSV or Excel file with date columns and let MakeCharts map the values automatically.
Share
Share Your Calendar Heatmap Anywhere
Download as PNG or SVG
Export a crisp, high-resolution image ready for reports, slides, or social posts.
Copy a Share Link
Generate a direct link so teammates or clients can view your heatmap instantly.
Embed on Your Site
Drop a lightweight embed code into any webpage to display a live calendar heatmap.
Add to Presentations
Paste the downloaded image straight into PowerPoint, Google Slides, or Notion.
About This Calendar Heatmap Tool
MakeCharts built this calendar heatmap maker so anyone can turn a list of dates and values into a clear, color-coded visual in minutes. No spreadsheet formulas. No design software. Just your data and a goal.
<2 minTime to first heatmap
5+Color palettes
10k+Charts created
365+Days of data supported
PNG & SVGExport formats
Workflow
How to Make a Calendar Heatmap
Add Your Date-Value Data
Enter dates (YYYY-MM-DD) and numeric values manually, paste them in bulk, or let AI generate a sample dataset from your description.
Customize the Appearance
Pick a color palette, set cell size and spacing, add a chart title, and toggle month labels, day labels, and the legend to match your needs.
Export and Share
Download a PNG or SVG, copy a share link, or grab the embed code — your calendar heatmap is ready to use anywhere in seconds.
Use cases
Who Uses a Calendar Heatmap?
Track Commits and Deployments
Visualize coding activity, pull request volume, or deployment frequency across the year to spot sprints, slowdowns, and burnout risks.
Visualize Habits and Streaks
Map daily workouts, sleep scores, or meditation sessions across a full year to celebrate streaks and identify gaps in your routine.
Spot Revenue and Traffic Patterns
Display daily sales totals, website sessions, or customer sign-ups to reveal seasonal peaks, campaign impact, and slow periods at a glance.
Monitor Study and Writing Progress
Record daily study hours, words written, or experiment entries on a calendar heatmap to stay accountable and visualize long-term effort.
Templates
Start with professionally designed templates
Academic Calendar calendar-heatmap for Smarter Term Planningcalendar-heatmap
Visualize term workload, breaks, and peak academic dates fast with a professional Academic Calendar Template calendar heatmap.
Track Publishing Consistency with a calendar-heatmapcalendar-heatmapVisualize publishing activity fast with a Content Calendar Template. Spot gaps, track consistency, and create a professional heatmap in minutes.
Editorial Calendar calendar-heatmap Template for Smarter Publishingcalendar-heatmapVisualize publishing activity fast with this Editorial Calendar Template. Spot gaps, peak days, and content cadence in a clear calendar heatmap.
Related Tools
Create similar charts with these tools
Content Calendar Heatmapcalendar-heatmap
Plan and visualize your content schedule with a calendar heatmap. Map posting frequency, track consistency, and spot gaps in your content strategy instantly.
Activity Heatmap Makercalendar-heatmapCreate a calendar heatmap in seconds. Visualize daily activity, habits, or contributions across weeks and months — free, no sign-up required.
GitHub Contribution Chart Makercalendar-heatmapCreate a GitHub contribution chart in seconds. Visualize daily activity as a calendar heatmap — customize colors, export, and share instantly. No signup needed.
Track Habits with a Heatmapcalendar-heatmapBuild your habit tracker calendar heatmap in seconds. Visualize daily streaks, consistency scores, and yearly progress patterns — free, no signup required.
Comparison
Calendar Heatmap Maker vs. DIY Spreadsheets
Skip the formula gymnastics and get a publication-ready heatmap in minutes.
MakeCharts Calendar Heatmap Maker
- Automatic calendar grid from raw date-value pairs
- 5 curated color palettes ready in one click
- Share via link or embed without sending files
- Polished legends, labels, and tooltips built in
- AI can generate or clean your dataset on demand
- Live preview updates instantly as you edit
Manual Spreadsheet Approach
- Hours spent on conditional formatting rules
- No built-in calendar grid layout for date data
- Hard to share without sending a file attachment
- Color scales rarely look polished or branded
- Tooltips and legends require complex workarounds
- Updating data means reformatting the whole sheet
FAQ
Frequently Asked Questions
What is a calendar heatmap?
A calendar heatmap displays daily numeric values as color-coded cells arranged in a calendar grid — typically rows for days of the week and columns for weeks. Darker or more saturated cells represent higher values, making it easy to spot patterns, streaks, and outliers across months or a full year.
How do I use this calendar heatmap maker?
Add your date-value entries manually, paste them in bulk (one 'YYYY-MM-DD, value' pair per line), or describe your dataset to the AI. Then choose a color palette, adjust cell size and labels, and preview the result instantly. When you are happy, download or share.
What date format does the heatmap tool accept?
Dates should follow the YYYY-MM-DD format (for example, 2024-06-15). This standard format ensures accurate placement of each cell in the correct week and month column of the calendar grid.
Can I make a GitHub-style contribution heatmap?
Yes. The default layout mirrors the familiar GitHub contribution graph — weeks run left to right, days of the week run top to bottom, and months are labeled along the top. Use the green palette for the closest match to GitHub's style.
Is the calendar heatmap generator free?
Yes. The core calendar heatmap maker is completely free with no sign-up required. You can add data, customize colors and labels, and download a PNG at no cost. AI-assisted generation uses free credits included with every account, and Pro plans unlock CSV upload and higher AI usage.
How many days of data can I visualize?
The tool handles a full year (365+ days) of daily data comfortably. Each date-value entry maps to a single cell, so you can cover multiple months or an entire calendar year in one view.
Can I change the color palette of my calendar heatmap?
Absolutely. Choose from five built-in palettes — green, blue, orange, purple, and red — to match your brand or data context. Each palette uses a light-to-dark intensity scale so lower values appear lighter and higher values appear darker.
Can I embed a calendar heatmap on my website?
Yes, with a Plus or Pro plan you can copy an embed code and drop your calendar heatmap directly into any webpage, blog, or documentation site.
What file formats can I export my heatmap in?
You can download your calendar heatmap as a PNG image for immediate use in presentations and reports, or as an SVG for scalable, print-quality output.
Can I track habits with this calendar heatmap tool?
Yes. Habit tracking is one of the most popular uses. Assign a value of 1 for days you completed a habit (or a numeric score like minutes exercised), leave missing days blank, and the heatmap instantly shows your streaks and gaps across the year.
Built for Everyone
- No coding or design experience required — intuitive controls anyone can use
- Works on desktop, tablet, and mobile without any installation
- Available in 12+ languages across the full interface
- Free tier gives full access to the calendar heatmap tool with no sign-up
- Keyboard-accessible controls for users who prefer not to use a mouse
- Simple enough for students, powerful enough for data analysts
Your Data, Your Control
- Your data is used only to render your chart — it is not stored on our servers without your consent
- We do not sell or share your data with third parties
- You can delete your account and all associated data at any time
- No personal information is required to use the free calendar heatmap maker
- Downloads happen locally in your browser — your chart stays on your device
Start now
Ready to Build Your Calendar Heatmap?
Go from raw date data to a polished, shareable heatmap in under two minutes.
- Free — no sign-up required
- Live preview as you type
- 5 color palettes to choose from
- Download as PNG or SVG
- AI generation included
- Share or embed anywhere
No sign-up needed. Free forever.