Testing contacts for the first time feels exciting, especially when you want a break from frames. Our glasses-to-contact conversion chart helps you check your vision measurement and avoid buying the wrong lenses. The tidy conversion table lays out every number you need to calculate your lens power the right way. 

Grab our printable PDF or download our PNG version if you like having a clean chart to print or save on your phone. The simple setup works well for quick comparisons and easy conversion checks. The whole measurement process feels clear because every chart gives you a direct reference before you order your new contacts. This little system keeps your conversion steps organized and easy to follow.

What Is The Glasses-To-Contact Conversion Formula?

The formula explains how your glasses’ power changes when the measurement becomes contact lens power. Because contacts sit right on your eye, the measurement changes slightly, and the conversion matters. The glasses-to-contact conversion formula goes like this:

  • Contact Lens Power = Glasses Power ÷ (1 − 0.012 × Glasses Power)

Here’s how the formula works in real life so your vision stays consistent. When someone has a glasses power of −6.00, the formula often gives a contact lens power close to −5.50. A glasses power of −3.50 usually converts to about −3.25. You can use the conversion table to calculate your number and confirm the measurement with our printable PDF chart or cheat sheet to print at home. The chart keeps every conversion clear and helps you check the measurement quickly.

Our Glasses-To-Contact Conversion Chart Helps You See 

Our glasses-to-contact conversion chart gives your measurement structure and prevents power mistakes. The table breaks every conversion into simple steps so you know exactly how each number shifts. You match your glasses prescription to the chart and calculate the right lens power without guessing. Many users prefer a printable cheat sheet or free PDF download because the compact chart is easy to print whenever needed. This reference tool keeps your measurement steady and your contact choice accurate. The conversion formula also reduces the chance of choosing a lens strength that strains your eyes or causes discomfort. Some people use the chart to double-check their optometrist’s numbers, especially when comparing old prescriptions to new ones. Keeping our PNG version or printout nearby helps you confirm every glasses-to-contact calculation with confidence.

Learn what your doctor sees during your contact lens exam with our printable Snellen Chart guide.

Quick Checks for Every Prescription

Nothing feels more annoying than getting the wrong contacts in the mail, so use the conversion chart to prevent that moment. The chart keeps your measurements organized and helps you calculate the correct lens power with less stress. You can load the chart on your tablet, keep a copy at your desk, or save the file for easy reference. The table also gives you a clear way to compare old numbers to new ones when your prescription shifts. Using the chart makes the whole process feel more controlled and less like a guessing game. You get a small boost of confidence every time the conversion lines up perfectly with your prescription, almost like you just outsmarted your own eyeballs.

Download our Pintable Glasses-To-Contact Conversion Chart Today

This glasses-to-contact conversion chart is ready for download in PDF, PNG, and a clean table format, so you can print the table anytime. The chart covers key measurement points like sphere, cylinder, axis, and vertex distance, so your calculation feels quick instead of stressful. The conversion formula sits right in the layout, so your lens power stays consistent when your prescription changes. Many users save the cheat sheet because the measurement guide makes comparing diopters and base curve values way easier. A printed version also works great when you want a visual guide that doesn’t require zooming in, like you’re hunting for clues in a detective show. Keeping the measurement chart close helps you avoid that classic moment when you pretend you remember your numbers, but your brain is actually on vacation. The conversion table stays friendly enough that even your half-awake morning eyes can handle the measurement chart without complaining.

  • Free printable glasses to contact conversion chart for common spectacle spheres. Accurate table for 12 mm vertex distance:
    PDF – PNG
  • Comprehensive glasses to contact conversion table from 0 to 6 Diopters. Includes exact and recommended contact lens power:
    PDF – PNG
  • Printable glasses to contact conversion cheat sheet for high minus powers (-4 to -10 Diopters). Exact and rounded contact lens power in Diopters:
    PDF – PNG
  • Quick reference rules of thumb for glasses to contact conversion and lens adjustment based on Diopter power range:
    PDF – PNG