Art & Paint
Practical tools for painting and drawing: how much paint a wall needs, grids and value studies for your reference photos, palettes from images, canvas sizes and artwork pricing.
All tools
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Artwork Price Calculator
Compare three ways to price a painting: by size, by area and by cost. Add the frame and the gallery commission to see what you keep.
Canvas Size Calculator
Standard canvas sizes in cm and inches, the proportion of any canvas, the print size of a photo at 150 or 300 dpi, and the canvas closest to your photo.
Color Harmony Palette
Pick a base colour and a harmony: complementary, analogous, triadic, split, tetradic, square or monochromatic. See it on the HSL and the painter's RYB wheel.
Color Palette from Image
Pull 5 to 10 dominant colours from a photo, each with its hex, RGB and HSL values and its share of the picture. Export them as CSS variables or a PNG strip.
Crop Factor Calculator
Pick your camera's sensor to get its crop factor, and the equivalent focal length and f-number of your lens on full frame, with a table of common sensor sizes.
Depth of Field Calculator
Enter the focal length, aperture, subject distance and sensor to see the near and far sharp limits, the total depth and a table of apertures.
Drawing Grid Maker
Put a grid of squares over a photo to copy it square by square. Set the columns and rows, or the cell size in cm or inches, then download or print it.
Exposure Value Calculator
Enter the aperture, shutter time and ISO to get the exposure value (EV) and the EV at ISO 100, with a table of equivalent exposures that give the same EV.
Field of View Calculator
Enter the sensor size, focal length and subject distance to get the horizontal, vertical and diagonal angle of view and the covered width and height.
Flash Guide Number Calculator
Enter your flash's guide number, the ISO and either the distance or the aperture to get the third value, with a table of distances for common apertures.
Golden Hour and Blue Hour Calculator
Golden hour and blue hour times for any date and city, in its own time zone, from the Sun's altitude, with how many minutes each period lasts.
Grey Value Checker
Turn a reference photo into greyscale and 2, 3, 5 or 7 value steps, with a squint view and a value scale. Your photo stays on your device.
Hyperfocal Distance Calculator
Enter the focal length, aperture and sensor to get the hyperfocal distance and the near limit when focused there, with a table for common lenses.
Knitting Gauge Calculator
Work out the stitches to cast on and the rows to knit for your width and length, from your swatch, and the yarn weight that its gauge falls in.
Knitting Yarn Calculator
Enter your swatch gauge, the size of the piece, the yardage per 100 stitches and the yarn weight to get the yards, metres and skeins, with a gauge check.
ND Filter Exposure Calculator
Enter your exposure without the filter and choose an ND filter from ND2 to ND1000 to see the new exposure time, its stops and its optical density.
Paint by Numbers Maker
Turn a photo into a paint-by-numbers sheet: a few colours, small regions merged, every region numbered, and a palette with hex codes. Made on your device.
Paint Calculator
Work out how many litres of paint a room or wall needs: wall area less doors and windows, coats, coverage per litre, 10 % waste and the cans to buy.
Rule of Thirds Grid
Open a photo in your browser, draw thirds, golden ratio or diagonal guides over it and download the picture with the grid. The photo never leaves your device.
Star Trail Exposure Calculator
The longest exposure before stars trail, from your focal length, crop factor, aperture and pixel pitch, by the 500 rule and the NPF rule.
Time-Lapse Interval Calculator
Enter the event length, clip length and frame rate to get the interval between shots, the number of frames, the whole-second setting and the clip you will get.
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Photos you open stay on your device.