Layer Height Resolution Calculator
Layer height sets the vertical resolution of a 3D print: thinner layers give smoother sloped surfaces but more layers and longer prints. This calculator takes the object height, the layer height and the nozzle diameter, and returns the number of layers, the layers per millimetre, and the layer height as a percentage of the nozzle diameter so you can check it sits in a printable range. All inputs are user-editable.
Layer resolution formula
Number of layers = object height / layer height (rounded up)
Layers per mm = 1 / layer height
Layer height vs nozzle = (layer height / nozzle diameter) * 100
The layer count rounds up because a partial top layer still prints as a full pass. Keeping the nozzle ratio between about 25 and 75 percent is a common guideline.
Worked example
A 20 mm object at 0.2 mm layers with a 0.4 mm nozzle: layers = ceil(20 / 0.2) = 100. Layers per mm = 1 / 0.2 = 5.00. Layer height vs nozzle = (0.2 / 0.4) * 100 = 50.00 percent.
Layer height: frequently asked questions
How many layers will my print have?
Divide the object height by the layer height. A 20 mm tall object printed at 0.2 mm layers has 20 / 0.2 = 100 layers. Thinner layers mean more layers, finer vertical detail and a longer print.
What layer height should I use for my nozzle?
A common guideline keeps the layer height between about 25 and 75 percent of the nozzle diameter for reliable adhesion and extrusion. This calculator reports the layer height as a percentage of the nozzle diameter so you can check it falls in a sensible range.
Does a smaller layer height always look better?
Smaller layers improve curved and sloped surfaces but greatly increase print time, and below a point the gain is hard to see. Vertical walls and detail in the print plane are set by nozzle diameter and motion, not layer height.
Official sources
- U.S. National Institute of Standards and Technology: Additive Manufacturing.
- The layer-count and resolution relationships follow directly from dividing height by layer thickness.
Reviewed by the CalculatorHub team, edited by James Graham, 19 June 2026. See our methodology.