Paper Mache Paste Calculator
Paper mache paste is just flour and water in a ratio you choose, but mixing the wrong amount means either a half-coated project or a tub of paste going to waste. This calculator scales your flour-to-water ratio to whatever total paste volume you need. Estimate the volume from your project's surface area, the number of layers, and a coverage rate you set, then the calculator splits the total into flour and water at your ratio and reports the volumes in cups and millilitres. The ratio and coverage are your inputs because they depend on your recipe, paper, and working style.
Paste volume formula
Total paste = surface area * layers * coverage
Total parts = flour parts + water parts
Flour = total paste * flour parts / total parts
Water = total paste * water parts / total parts
US cups = total mL / 236.588
One US cup is 236.588 millilitres. The ratio splits the total volume into flour and water; the proportions are preserved exactly whatever total you need.
Paper mache context
- Flour paste is mixed by parts; the right ratio depends on the consistency you want.
- Coverage varies with paper type and how wet you work, so set it from experience.
- The same arithmetic scales a white-glue-and-water mix: enter glue and water parts.
- Adjust consistency by eye after mixing; paper mache paste is forgiving.
- The millilitre and US cup are defined through the NIST Office of Weights and Measures.
Paper mache paste: frequently asked questions
What is the flour-to-water ratio for paper mache paste?
Flour paste is mixed by parts of flour to parts of water, commonly something near 1 part flour to 2 parts water for a brushable consistency, but recipes vary widely. Because the right ratio depends on the look you want and your flour, the calculator takes your ratio as an input rather than fixing one.
How much paste do I need?
Estimate the paste volume from your project: surface area times the number of layers times a coverage rate. Coverage depends on paper type and how wet you work, so enter your own figure. Once you have a target volume, the calculator splits it into flour and water at your chosen ratio.
How does the ratio convert to volumes?
The total parts are flour parts plus water parts. Flour volume equals total volume times flour parts divided by total parts; water volume is the remainder. For a 1 to 2 ratio, one third of the volume is flour and two thirds is water. The calculator computes both for your target volume.
Should I mix by volume or weight?
Paper mache paste is forgiving and usually mixed by volume (cups or millilitres), which is why this calculator works in volume. If you prefer weight, flour and water differ in density, so convert using your flour's bulk density. Adjust the consistency by eye after mixing regardless of method.
Can I use this for paste-and-glue recipes?
The calculator scales any two-part ratio to a target volume, so it works for flour-and-water paste. For white-glue-and-water mixes the same arithmetic applies: enter the glue parts and water parts as your ratio. The output is simply the two component volumes at your chosen proportion.
Official sources
- NIST: Units of volume (millilitre and US cup).
- NIST: Office of Weights and Measures.
Reviewed by the CalculatorHub team, edited by James Graham, 17 June 2026. See our methodology.