Transfer any reference to any canvas size — the same method used by Leonardo da Vinci.
Preview subject:
Source Image (reference/photo)
Target Surface (canvas/paper)
Scale Factor
2.00×
Proportional ✓
Source cell size
1.000in × 1.000in
Draw this size grid on reference
Target cell size
2.000in × 2.000in
Draw this size grid on canvas
Grid layout
8 × 10
Columns × rows
Total cells
80
Squares to copy
Quick method: Draw a 8×10 grid lightly in pencil on both your reference and canvas — use 1.00in squares on the reference and 2.00in squares on the canvas. Copy one cell at a time. Erase grid lines when done.
Follow this path from your first grid copy to professional-scale works.
First Grid Copy
Beginner · 20–30 min
Print a 4×6 photo and trace a 6×6 pencil grid on it. Draw the same grid at 2× on your canvas (8×12"). Copy each cell one at a time — look at shape, not the whole image. This is the most important skill in all of drawing.
Sketchbook to Canvas
Early learner · 1–2 hrs
Transfer a pencil sketch from a 9×12" sketchbook pad to an 18×24" canvas. Work with 8 columns — you'll have about 85 cells. This scale is large enough to practice shading and tone without the pressure of a fresh reference.
Portrait Study
Intermediate · 3–6 hrs
Scale a sketchbook portrait study to a 27×36" gallery canvas at 3×. Use 12 columns for finer grid detail — each source cell is just 0.75" wide, forcing you to really look at small shapes. This is where you develop a painter's eye.
Mural Scale
Advanced · 10+ hrs
Work from a 4×5" thumbnail sketch to a 36×45" wall panel — the same 9× jump muralists use from sketchbook to building. Use 16 columns. At this scale the grid lines are drawn with chalk or charcoal and dusted off as sections complete.
Download ready-to-print SVG grids — labelled columns (A, B, C...) and numbered rows so you never lose your place.
🟫
4 × 5 Grid
20 cells · Beginner
Great for simple photos
🟩
6 × 8 Grid
48 cells · Easy
Standard photo format
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8 × 10 Grid
80 cells · Intermediate
Most popular size
🟪
10 × 12 Grid
120 cells · Advanced
Fine detail work
🖨️ How to Print
Step 1. Download the SVG file above (opens in any browser).
Step 2. Open in your browser, then File → Print.
Step 3. Set paper size to Letter (8.5×11") or A4.
Step 4. Critical: Set scale to 100% / Actual Size. Never use "fit to page" — it changes cell proportions.
Step 5. Print two copies — one to draw on your reference, one for your canvas.
🎯 How to Use the Template
On your reference: Place the printed grid over your photo or sketch, tape in place (or use a light box). The cells will show through.
On your canvas: Use the calculator above to find your target cell size, then draw the matching grid lightly in pencil — same column letters (A, B...) and row numbers (1, 2...).
Copy by cell: Work cell A1 on reference → A1 on canvas. Focus only on the shapes inside that one square. Never look at the whole image.
Finish: Erase or paint over pencil grid lines when composition is set.
🎯 A Simple Example: Enlarging a Photo Reference
You have an 8×10" photo you want to paint as a 16×20" canvas. Here's the process:
1️⃣ Select 8×10 → 16×20 from the presets — or enter your own dimensions.
2️⃣ Choose 8 columns — the calculator auto-sets rows to 10 (matching the 4:5 ratio).
3️⃣ Draw a light pencil grid on your photo: 1.00" × 1.00" squares (80 cells total).
4️⃣ Draw a matching grid on your canvas: 2.00" × 2.00" squares (same 80 cells, twice as large).
5️⃣ Copy the shapes in each cell — focus on one square at a time, not the whole image.
Pro tip: Draw your grid lines very lightly so they erase cleanly. Number each row and column (A1, A2...) so you never lose your place.
Data Source: The Grid Method — Historical technique documented in Cennino d'Andrea Cennini's 'Il Libro dell'Arte' (c. 1400) and used by Leonardo da Vinci, Albrecht Dürer, and the Old Masters • Public domain • Solo-developed with AI
A 600-Year-Old Cheat Code for Artists: Before photography, before projectors, and long before the internet debate about whether grids are "cheating," Renaissance masters faced the same practical problem every artist still faces today: how do you transfer a small sketch onto a massive fresco wall without losing the proportions? Their answer was the reticolato — a grid of fine thread stretched across the reference and a matching grid chalked onto the wall. Cennino d'Andrea Cennini documented the technique around 1400. Leonardo da Vinci refined it. Albrecht Dürer built elaborate wooden grid frames to capture perspective. The method has a perfect track record across 600 years because the mathematics behind it are undefeatable.
Why Grids Work (the Beautiful Math): The grid method works because it transforms an overwhelming whole into manageable parts. When you look at a full face to copy, your brain panics and invents shapes it thinks should be there. When you look at one grid square — an abstract blob of tone and line — your eye copies what it actually sees. Every cell is just a small abstract puzzle. Scale factor is pure arithmetic: if your source is 8 inches wide and your target is 16 inches wide, every linear dimension doubles. The key rule is that the number of grid squares stays the same in both — it's the size of each square that changes. As long as that ratio holds, your proportions are geometrically guaranteed.
On the "Cheating" Question: Some traditionalists argue grids are a crutch. The historical record disagrees. The grid method is a measuring tool, not a substitute for artistic decision-making — the same way a ruler doesn't "draw" a building for an architect. What the grid actually teaches is spatial observation: beginners who use grids carefully develop the ability to see comparative relationships between shapes, which is the core skill of representational drawing. Many artists use grids for the initial transfer and then work entirely freehand for shading, detail, and interpretation. The masters had no such qualms.
Modern Applications: Today the grid method appears in murals, illustration, photo-realistic painting, animation reference tracing, and educational art programs worldwide. Digital artists use it to establish compositions before painting over reference. Muralists scale tiny thumbnails to building-sized walls using this exact calculation. Whether you're enlarging a 3×4" sketch to a 9×12" canvas for the first time, or planning a 4×5-foot mural from a postcard, the math is the same — and this calculator does it in one step.
🐾 From the Lab Cat's Spatial Geometry Division:
I have observed the grid method closely. Humans draw a small box, then draw a big box, then stare at both very seriously and copy squiggles from one to the other. I attempted this myself. I drew a grid on the floor using my tail. My reference image was the food bowl. My canvas was also the food bowl. The scale factor was 1:1. The proportions were perfect. The bowl remains empty. More research required.
Scientific observation: the more squares in the grid, the longer the human is occupied and the less they notice me. I endorse larger grids. 16 columns minimum. 🎨