Watercolour Calculators
Calculators for wash sizes, paint dilution, paper stretching, masking and watercolour supplies.
Wash Size Calculator
Calculate the volume of diluted watercolour paint needed for flat, graded and variegated washes. Never run out mid-wash again.
Watercolour Dilution Calculator
Calculate watercolour paint-to-water ratios for different wash strengths. Covers wet-on-dry, wet-on-wet, glazing and dry brush.
Paper Stretch Calculator
Calculate gummed tape length, soaking time and drying time for stretching watercolour paper. Covers different paper weights and sizes.
Masking Fluid Calculator
Calculate masking fluid needed for watercolour painting based on area to mask, coverage percentage and number of coats applied.
Colour Lift Calculator
Check which watercolour pigments are liftable, staining or non-staining and plan your painting layers for easier corrections.
Half Pan Calculator
Calculate how many paintings a half pan or full pan of watercolour will last based on your painting frequency and usage style.
Tube Volume Calculator
Calculate how many half pans or full pans a tube of watercolour paint will fill. Plan your palette refills and tube purchases efficiently.
Palette Layout Calculator
Plan your watercolour palette layout by colour temperature, spectrum order or frequency of use. Optimise your pan arrangement.
8 free calculators in Watercolour
Watercolour Painting Techniques
Watercolour painting demands precision in dilution ratios and material preparation. Mixing too little wash means interrupting your flow to mix more, while incorrect paper stretching leads to buckling that ruins your work.
The wash size calculator works out exactly how much diluted paint you need for flat and graded washes at any scale. Our paper stretch calculator determines the gummed tape length and soaking time needed to properly stretch your watercolour paper before painting.
For planning your supplies, the half pan calculator estimates how many paintings you can get from a half pan or full pan, and the tube volume calculator works out how many half pans a tube of watercolour paint will fill.