Measure the diameter
Measure straight across the centre from one outer edge to the opposite outer edge. Do not measure the raised inner platform.
Free miniature hobby utility
Base size checker for Warhammer 40,000 miniatures
Check the physical base size of your Warhammer 40,000 miniatures on screen, print a true-size A4 guide, or download an exact SVG template. Supports round, oval and square bases from 10–160mm. This is an independent measurement tool, not an official unit-by-unit base-size database.
- No account needed
- Round, oval and square
- 10–160mm custom sizes
- Print or save as PDF
Measure on screen
Find your miniature base size
Choose a likely size, calibrate the outline with a normal bank card, then place the base against the screen. Use the nearest preset or enter an exact custom measurement.
Actual-size preview
32mm round base
Printable A4 guide
Print a true-size miniature base checker
The print view creates two clean A4 sheets: your current custom shape at exact size, plus a common round-base reference from 20mm to 100mm.
- 01Select the base shape and size above.
- 02Choose Actual size or 100% in the print dialogue. Disable “Fit to page”.
- 03Check the printed 100mm verification line with a ruler before measuring bases.
Measure correctly
How to check Warhammer 40,000 miniature base sizes
Warhammer 40,000 miniatures use a range of round and oval bases, and older models may have been supplied on different bases. This checker identifies the physical base in front of you; it is not an official unit-by-unit base-size database. For matched play, events or rebasing decisions, check the latest official guidance or the relevant event organiser.
Measure both axes
Record the shorter width and the longer length. For example, an oval may measure 32 × 60mm rather than having one diameter.
Verify before trusting
Printer scaling can change physical dimensions. Print at 100% and confirm the 100mm test line with a ruler before placing a base on the guide.
Need more context on current and older bases? Read the Warhammer 40,000 base sizes guide.
| Base size | Often used for | Measurement note |
|---|---|---|
| 20–25mm | Small models, markers, older infantry ranges and compact board-game pieces. | Small differences are hard to judge by eye; use the calibrated screen or print guide. |
| 28–32mm | Many modern infantry, troop squads and human-sized characters. | 28mm model scale does not guarantee a 28mm base. Measure the physical base. |
| 35–40mm | Larger infantry, characters, heavy troops and small creatures. | Check the widest outer diameter, including any bevel. |
| 50–65mm | Large characters, cavalry, monsters, bikes and compact vehicles. | Oval bases need both width and length. |
| 80–100mm | Large monsters, scenic bases, vehicles and centrepiece models. | Large templates may exceed a phone screen; use the A4 print option. |
| Custom 10–160mm | Unusual resin bases, scenic plinths, square bases and custom conversions. | Enter the exact measurement in 0.5mm steps and download an SVG template. |
Miniature base checker FAQ
Quick answers before you measure
The page works without an account and stores only your screen-calibration value locally in your browser.
How do I measure a round miniature base?
Measure the diameter across the centre from one outside edge to the opposite outside edge. Include the full bevel. A ruler or digital calliper gives the best result, but the calibrated screen and printable circles are useful for matching an unknown base.
Is a 28mm miniature the same as a 28mm base?
No. “28mm” often refers to an approximate miniature scale or model height convention. The model may be supplied on a 25mm, 28.5mm, 32mm, 40mm or another base. Measure the actual base rather than relying on the miniature’s stated scale.
How accurate is the on-screen base-size checker?
It becomes useful after calibration because browsers and screens do not display CSS millimetres at a guaranteed physical size. Match the bank-card outline to a standard 85.60mm-wide card, then compare the base. For critical fit decisions, confirm with a ruler or printed sheet.
How do I print the base-size checker at actual size?
Use the page’s Print button, choose A4 paper, select “Actual size” or “100%”, and disable “Fit to page” or automatic scaling. After printing, measure the 100mm verification line. If that line is not exactly 100mm, correct the print scale before using the circles.
Does the checker work with oval and square bases?
Yes. Choose Oval or Square, then enter width and length. The screen preview, custom print page and downloadable SVG update to those exact dimensions. Measure both outside axes for an oval base.
Can I use this checker for Warhammer 40,000 miniature bases?
Yes. Use it to identify the physical diameter or outside dimensions of the base you have in front of you. It does not tell you which base a particular unit is officially required to use, so check current official guidance or event rules when that distinction matters.