Picture Frame Size Calculator

How to Calculate Picture Frame Sizes for Custom Artwork and Photos

The Picture Frame Size Calculator is a practical tool for anyone working with visual art, photography, or document presentation. It helps you determine the exact dimensions for the mat, glass, backing, and frame needed for a specific image. Whether you're an artist, designer, or professional framer, this calculator ensures your frame fits perfectly—both functionally and aesthetically.

By entering just a few measurements, the tool computes total frame dimensions, mat board sizes, and even a shopping list for materials. This saves time, reduces errors, and guarantees a professional finish for framed work.

Understanding the Frame Size Formula

The calculator uses a simple layering logic to determine how each component contributes to the final frame size. Here’s how it works:

Total Width = Image Width + (Left Mat Margin + Right Mat Margin) + 2 × Frame Width

Total Height = Image Height + (Top Mat Margin + Bottom Mat Margin) + 2 × Frame Width

This ensures the final frame size includes all the layers—image, mat, and frame edge—without guesswork.

Real-World Example: Framing a 20×30 cm Image

Let’s walk through a real example using the following input:

• Image Dimensions: 20 cm wide × 30 cm high

• Mat Margins: 5 cm on all sides

• Frame Width: 3 cm

The calculator returns the following results:

This example illustrates how a small photo or artwork becomes a much larger display piece once all components are added.

Aspect Ratio and Aesthetic Balance

The tool also calculates the aspect ratio, in this case, 18:23. This ratio helps ensure that the mat and frame proportions complement the artwork. Keeping the same aspect ratio between the image and the mat prevents visual imbalance.

Use consistent or harmonizing ratios to:

• Maintain symmetry

• Avoid overly thick or thin borders

• Create pleasing compositions for gallery walls

Common Mat and Frame Sizes

Here are standard mat margin presets offered by the calculator:

• 2 cm: Minimal border, modern look

• 3 cm: Balanced for small frames

• 5 cm: Gallery-standard for medium prints

• 7.5 cm: For larger artworks and open spacing

• 10 cm: Bold margin for standout display

And popular frame widths:

• 1 cm: Thin modern metal or wood

• 2–3 cm: Most common for photography and diplomas

• 4–5 cm: Decorative or baroque frames

Choosing mat and frame width depends on the size of the image and the visual impact you want to create.

Why You Should Use a Picture Frame Calculator

Using a calculator simplifies custom framing and reduces the chance of error. Benefits include:

• Accurate total dimensions for wall space planning

• Correct mat size for visual balance

• Efficient material usage (glass, backing, mat board)

• Easier preparation for custom orders or DIY projects

• Automatic shopping list generation

It’s particularly helpful when ordering materials online or communicating specs to a frame shop.

Materials Shopping List Based on Your Design

Based on your selections, the calculator generates a detailed shopping list:

Having these numbers up front ensures you get the right cuts at your local craft store or framing supplier, saving time and minimizing waste.

How to Measure Your Artwork for Framing

Before using the calculator, take these steps:

1. Lay the image flat and measure the exact width and height in cm or inches.

2. Decide on mat usage: Will it be included? How wide should the margins be?

3. Choose your frame width: Thin or wide depends on style and space.

4. Note display environment: Use larger mats for gallery displays, or thinner ones for home décor.

Always round up measurements slightly to allow for trimming or mounting variation.

Should I Always Use a Mat?

Using a mat provides multiple benefits:

• Protects artwork from direct contact with the glass

• Enhances presentation by adding depth and spacing

• Allows for color coordination to match the room or frame

However, some modern or minimalist displays use no mat—especially for posters, full-bleed prints, or digital art.

If you opt for no mat, just disable the mat settings in the calculator to adjust the frame size directly around the image.

Can I Use This Calculator for Diplomas and Certificates?

Absolutely. The calculator is perfect for:

• Academic diplomas

• Professional licenses

• Certificates of achievement

• Awards and recognitions

These documents often use standard sizes (e.g., 21×29.7 cm or 8.5×11 inches), making it easy to pair them with stock mats and frame profiles.

Just measure the paper and input the values to determine the right frame and mat dimensions for display.