Drawing Calculators
Calculators for pencil grades, paper sizes, grids, perspective, scaling and drawing materials.
Pencil Grade Calculator
Find the right pencil grade range for your drawing style and subject matter. Covers graphite, charcoal and coloured pencil ranges.
Paper Size Calculator
Convert between A-series, imperial and custom paper sizes with area calculations. Includes weight and sheet count estimation.
Proportion Grid Calculator
Calculate grid dimensions for accurately scaling a reference photo or image onto your drawing surface. Free online grid calculator for artists.
Perspective Calculator
Calculate vanishing point positions and horizon line placement for one, two and three-point perspective drawings. Free calculator.
Drawing Scale Calculator
Convert real-world measurements to drawing scale and vice versa. Useful for architectural sketches and technical illustration.
Charcoal Calculator
Estimate charcoal sticks, pencils and fixative spray needed for a drawing project based on surface area and coverage density.
Pastel Calculator
Calculate the number of soft pastel or oil pastel sticks and sanded paper needed for your artwork based on size and colour complexity.
Sketchbook Calculator
Work out how many sketchbook pages you need and estimate usage over time based on your drawing frequency, habits and media type.
8 free calculators in Drawing
Drawing Tools & Techniques
Drawing is the foundation of most visual art. From choosing the right pencil grade to setting up accurate proportion grids, having precise measurements and calculations makes the difference between a good drawing and a great one.
Our proportion grid calculator helps you transfer reference images to any size drawing surface while maintaining correct proportions. The perspective calculator works out vanishing point positions for accurate one-point and two-point perspective drawings.
For scaling artwork up or down, the drawing scale calculator converts between real-world measurements and your chosen drawing scale, making it simple to produce accurate technical drawings or enlarge sketches for finished pieces.