The Problem
As a developer who spends time in both the digital and physical worlds, I kept running into the same frustrating scenario:
- In the kitchen: Converting cups to milliliters while following a recipe
- In the workshop: Converting mm to inches for a woodworking project
- At the desk: Converting Fahrenheit to Celsius for international documentation
Sure, there are apps and websites that do conversions, but I wanted something physical – a chart I could print and stick to my wall, tape to my toolbox, or keep in my notebook. Something that doesn't require unlocking my phone, opening an app, and typing in numbers.
The Solution: ChartsPrintables.com
So I built ChartsPrintables – a collection of 60+ free printable conversion charts covering:
📏 Length Conversions
- MM ↔ Inches
- CM ↔ Inches
- Feet ↔ Meters
- And more...
🥄 Volume Conversions
- Cups ↔ Milliliters
- Tablespoons ↔ Milliliters
- Fluid Ounces ↔ Milliliters
- Gallons ↔ Liters
⚖️ Weight Conversions
- Grams ↔ Ounces
- Kilograms ↔ Pounds
- Ounces ↔ Pounds
🌡️ Temperature
- Fahrenheit ↔ Celsius
- Celsius ↔ Kelvin
- Oven Temperature Guide
🔧 Special Charts (My Favorites!)
- Fraction to Decimal conversions
- Drill Bit Sizes
- Screw Sizes
- Wire Gauge
- Lumber Sizes
- Tire Sizes
- Wrench Sizes
Why It's Different
✅ No Signup Required
I hate it when websites force you to create an account just to download a simple PDF. On ChartsPrintables, you can browse, customize, and download without ever entering your email.
🎨 Customizable
Each chart can be customized before downloading:
- Choose your preferred units
- Select paper size (A4, Letter, etc.)
- Pick color themes
📱 Mobile-Friendly
The site works great on mobile, so you can quickly look up a conversion when you're in the middle of a project.
🖨️ Print-Ready
Every chart is designed to look great when printed – clean, readable, and properly formatted.
The Tech Stack
For the curious developers:
- Frontend: Next.js 14 with App Router
- Styling: Tailwind CSS
- Charts: Custom React components with SVG rendering
- Export: html2canvas + jsPDF for PDF generation
- Hosting: Vercel
- Payments: Creem (for the PRO features)
The most interesting technical challenge was generating print-perfect PDFs from React components. I experimented with several approaches before settling on a client-side rendering solution that produces crisp, vector-quality charts.
Use Cases
The site is organized by real-world use cases:
🍳 Kitchen
Perfect for home cooks and bakers who need quick reference for recipe conversions.
🔨 Workshop
Essential for woodworkers, metalworkers, and DIY enthusiasts working with mixed measurement systems.
🎓 Education
Teachers and students can print charts for classrooms and study materials.
🏭 Engineering
Professionals who need reliable conversion references at their desk.
Chrome Extension
I also built a Chrome Extension that gives you instant access to the charts without opening a new tab. Just click the icon and search for any conversion.
What's Next?
I'm actively adding new charts based on user requests. Some coming soon:
- Currency conversion tables
- Time zone reference charts
- Cooking temperature guides for different meats
- Knitting needle size conversions
Try It Out
🌐 Website: https://chartsprintables.com
🔧 Chrome Extension: Get it on the Chrome Web Store
I'd love your feedback! What conversion charts do you find yourself looking up most often? Let me know in the comments and I'll prioritize adding them.
Built with ❤️ by a developer who was tired of googling "mm to inches" every weekend.
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