3D Print Scale Calculator
This free 3d print scale calculator turns miniature and model scales into the exact uniform % you paste in Cura, Bambu Studio, PrusaSlicer, or Lychee — 28mm → 32mm heroic (114.3%), 1:100 → 1:56, or any custom mm / 1:N pair. No STL upload; copy the result and slice.
Formula: slicer_percent = (target_ratio ÷ source_ratio) × 100. Lock uniform XYZ in your slicer. Eye-level vs top-of-head mm conventions are explained below — they are community norms, not publisher canon.
How do I calculate slicer scale percentage?
Divide the target scale by the source scale, then multiply by 100. For 1:N ratios, use the N number (the denominator after the colon).
slicer_percent = (target_ratio ÷ source_ratio) × 100
28mm heroic → 32mm heroic (eye-level):
(32 ÷ 28) × 100 = 114.3%
1:100 → 1:56:
(100 ÷ 56) × 100 = 178.6%
Known dimension:
(target_mm ÷ source_mm) × 100 — same math when you measure the mesh on the bed.
What is the 175 cm human baseline for 28mm and 32mm?
Wargame labels like 28mm and 32mm heroic assume a modeled human against a 175 cm (~5 ft 9 in) reference adult — a tabletop convention popularized in community guides (e.g. STLACCESS-style references), not an official Games Workshop specification.
Eye-level (default)
28 mm and 32 mm refer to height at the eyes. Best match for most heroic fantasy STLs on Thingiverse and Patreon.
Top-of-head
Measures to the top of the head. Same label “28mm” prints shorter vs eye-level. Pick this mode if your army uses crown-height baselines.
Uniform scale
Apply the same % on X, Y, and Z. Non-uniform stretch breaks proportions and weapon reach.
What is 28mm to 32mm in slicer percent (2026)?
Worked example — heroic 28mm → 32mm, eye-level (March 2026)
source_ratio = 28 · target_ratio = 32
slicer_percent = (32 ÷ 28) × 100 = 114.2857…% → type 114.3% in the slicer
You downloaded a proxy squad authored at 28mm eye-level. Your table uses 32mm heroic. Select the STL in Bambu Studio, open Scale, link uniform axes, enter 114.3%, slice, and check base-to-eye against a known 32mm reference miniature.
Reverse (32 → 28): (28 ÷ 32) × 100 = 87.5%. After scaling, send grams from your slicer to the 3D Print Cost Calculator for a client quote.
What are common miniature and model scale pairs?
As of 2026-03-05 — percentages use uniform XYZ scaling and eye-level mm where noted. Verify against a physical reference for tournament tables.
| From | To | Slicer % | Typical use |
|---|---|---|---|
| 28mm (eye) | 32mm (eye) | 114.3% | Heroic fantasy proxy upsize |
| 32mm (eye) | 28mm (eye) | 87.5% | Shrink heroic sculpt to classic 28mm tables |
| 1:100 | 1:56 | 178.6% | Architectural model to Bolt Action–style terrain |
| 1:56 | 1:48 | 116.7% | Wargame to O-scale diorama |
| 1:48 | 1:35 | 137.1% | Rail / display to large military kit scale |
| 1:72 | 1:56 | 128.6% | Aircraft kit parts to 28–32mm scenic bases |
| 1:100 | 1:72 | 138.9% | HO-scale building to 1:72 vignette |
| 1:285 (N scale) | 1:56 | 508.9% | Model railroad prop to tabletop wargame (large upsize) |
For any custom pair, use the calculator above or (target N ÷ source N) × 100 for 1:N → 1:N moves.
Where do I paste scale % in Cura, Bambu, PrusaSlicer, and Lychee?
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1
UltiMaker Cura
Select the model → left toolbar Scale (cube icon) → enable Uniform scaling → type the % from this calculator. Percent is relative to the imported size (100% = original).
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2
Bambu Studio
Select object → right panel Scale → link X/Y/Z → enter 114.3 (or your result) in the percent field. Or use the scale gizmo and type the numeric factor.
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3
PrusaSlicer
Right-click the object → Scale from the context menu, or open Object settings → Scale. Set uniform % on all axes before slicing.
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4
Lychee (resin)
Select the model → Transform tab → Scale → uniform %. Optional: enable the calculator’s +1% resin shrinkage rule-of-thumb checkbox before copy.
As of 2026-03-05 — menu names from Cura, Bambu Studio wiki, PrusaSlicer help, and Lychee docs.
Who uses a miniature scale converter?
Wargame proxy printers
Resize Patreon STLs from 28mm to 32mm heroic before batch plate slicing.
D&D terrain makers
Match dungeon tiles across 1:56 and 1:48 scenic standards.
Model railroad crossovers
Upsize N-scale (1:285) props for 1:56 battlefield scatter.
Print shops
Quote scaled jobs with the 3D Print Cost Calculator after slicing.
Frequently asked questions
What is a 3d print scale calculator?
A browser tool that outputs the uniform slicer % for converting miniature or model scales. Enter source and target (28mm, 32mm, 1:56, custom) and copy the result.
What percentage is 28mm to 32mm?
114.3% with eye-level convention on both sides (32 ÷ 28 × 100). Uniform XYZ only.
How do I scale 1:100 to 1:56?
(100 ÷ 56) × 100 = 178.6%. The part grows because 1:56 is physically larger than 1:100.
Where do I paste % in Bambu Studio?
Object selected → Scale panel → linked axes → type the calculator output.
What is the 175 cm baseline?
Heroic mm labels map a human to ~175 cm. Eye-level measures to eyes; top-of-head to crown. Pick one convention and stick with it.
Should X, Y, and Z scale differ?
No for scale conversion. Use uniform % so weapons, heads, and bases stay proportional.
Does resin shrinkage change the number?
Some makers add ~1% overscale as a rule of thumb. Use the optional checkbox; verify with a caliper on cured prints.
Can I use a measured mm dimension?
Yes. (target_mm ÷ source_mm) × 100 equals the same slicer percent as ratio mode.
Is it free?
Yes. No login. Math runs locally in your browser.
Does this resize my STL file?
No. Your slicer applies the transform at slice time. Export scaled STLs only if you choose Save/Split in the slicer.
Why does my mini still look off?
Mixed eye vs crown conventions, non-uniform axes, or a non-standard authored height. Measure and use known-dimension mode.
Ready to quote the scaled print?
After you slice at the new %, copy grams and hours into the 3D Print Cost Calculator for a client-ready price.
Open 3D Print Cost Calculator