One point is exactly 0.3527777778 millimeters, so converting points to millimeters is a single multiplication. Enter any figure and the result appears as you type — the arithmetic runs in your browser, so nothing is sent anywhere.
One thousandth of a metre — the finest gradation on a standard ruler. The DTP point: exactly 1/72 inch, the unit type size is set in.
The mil and the millimetre are not the same thing and are out by a factor of about forty. A mil is one thousandth of an inch — 0.0254 mm — and a spec sheet that quotes film thickness in mils means the small unit. British drawings write the same size as "thou". Below the calculator there is a step table for the values people look up most, and a second table putting real length figures into millimeters so the number you get has something to be compared against.
The formula
points- The amount you are converting, in points
0.352777777778- The exact number of millimeters in one point
millimeters- The converted result
How it works, step by step
- Enter the value in points.
- It is multiplied by 0.352777777778, the exact factor between the two units.
- The answer is shown in millimeters, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A door height: 5760 pt in millimeters
Take a door height, roughly 5760 pt. The conversion is a single multiplication — 5760 × 0.352778 — giving 2032 mm. Because the relationship is proportional, doubling the input doubles the answer to 4064 mm.
An Olympic pool: 1.42e+05 pt in millimeters
An Olympic pool comes to about 1.42e+05 pt. Multiplying by the factor: 1.42e+05 × 0.352778 = 50,094.4 mm. Dividing the answer back by 0.352778 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
How to read your score
Frequently asked questions
How many millimeters are in one point?
Exactly 0.352777777778. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert points to millimeters?
millimeters = points × 0.352777777778. Reversed, points = millimeters ÷ 0.352777777778, which is the same as multiplying by 2.83464566929.
Which is the bigger unit, the point or the millimeter?
The millimeter. One point is only 0.352778 of a millimeter, so it takes 2.83465 points to make one millimeter.
What does this quantity actually measure?
Both units measure length. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a point?
The DTP point: exactly 1/72 inch, the unit type size is set in.
What is a millimeter?
One thousandth of a metre — the finest gradation on a standard ruler.
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Is there a quick way to do pt to mm in my head?
Plenty of people do this in their head: divide by 2.8 instead of using the exact factor 0.3527777778. At 100 that shortcut gives 35.714286 millimeters, off by 0.4365 millimeters or about 1.24%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Points to millimeters reference tables
| Points | Millimeters |
|---|---|
| 0.5 pt | 0.176389 mm |
| 1 pt | 0.352778 mm |
| 2 pt | 0.705556 mm |
| 3 pt | 1.05833 mm |
| 5 pt | 1.76389 mm |
| 10 pt | 3.52778 mm |
| 20 pt | 7.05556 mm |
| 25 pt | 8.81944 mm |
| 50 pt | 17.6389 mm |
| 75 pt | 26.4583 mm |
| 100 pt | 35.2778 mm |
| 250 pt | 88.1944 mm |
| 500 pt | 176.389 mm |
| 1000 pt | 352.778 mm |
| 5000 pt | 1763.89 mm |
Exact factor: 1 point = 0.352777777778 millimeters.
| Quantity | pt | mm |
|---|---|---|
| A credit card’s long edge | 242.6 pt | 85.6 mm |
| A door height | 5760 pt | 2032 mm |
| An Olympic pool | 1.417e+05 pt | 5e+04 mm |
| The Eiffel Tower | 9.354e+05 pt | 3.3e+05 mm |
| A marathon | 1.196e+08 pt | 4.22e+07 mm |
| Earth’s diameter | 3.612e+10 pt | 1.274e+10 mm |
Published reference values, converted with the same factor this page uses.