Paper thickness, or caliper, is measured in points (thousandths of an inch) in the U.S. and in microns elsewhere. Ordinary copy paper is about 4 pt (0.1 mm); business cards are 14–16 pt. Measuring a whole ream and dividing is far more accurate than measuring one sheet.
How to use the Paper Thickness Calculator
- Stack thickness
- Number of sheets
- Every result field is editable: type into Thickness of one sheet and Stack thickness plus every other field update to match.
Results update as you type, and every field accepts the units shown in its menu.
How it works
Measure the height of a stack and count the sheets (a ream is 500). Type a sheet thickness into the result to find the height of the stack.
Tips
- Track a typical week before planning – real figures beat estimates.
- Break big tasks into smaller pieces and plan buffer time for interruptions.
- Re-run the numbers when your inputs change so plans stay realistic.
- Use results as a guide for decisions, not as a precise prediction.
Common mistakes to avoid
- Counting calendar days when the deadline is in working days (or the reverse).
- Forgetting breaks, setup and handover time.
- Assuming every day is as productive as your best day.
Inputs explained
| Field | What to enter |
|---|---|
| Stack thickness | Units: mm, cm, in |
| Number of sheets | A number |
What each result means
- Thickness of one sheet = [Stack thickness]÷[Number of sheets]
- Height of a 500-sheet ream = [Thickness of one sheet]×500
Example values
How the main result changes when Stack thickness changes and everything else stays at the example values above:
| Stack thickness (mm) | Thickness of one sheet (pt (mil)) |
|---|---|
| 25 | 1.97 |
| 37.5 | 2.95 |
| 50 | 3.94 |
| 62.5 | 4.92 |
| 75 | 5.91 |
| 100 | 7.87 |
Formula
Sheet thickness = stack thickness ÷ number of sheets1 point (pt) = 1 mil = 0.001 in = 25.4 µmWorked example
Inputs — Stack thickness: 50 mm; Number of sheets: 500.
Results — Thickness of one sheet = 3.94 pt (mil); Height of a 500-sheet ream = 50 mm.
Frequently asked questions
How thick is a sheet of printer paper?
About 0.1 mm (4 pt) for 20 lb / 75–80 gsm copy paper.
How thick is cardstock?
8–14 pt (0.2–0.36 mm) depending on weight.
How many times can you fold paper?
Folding doubles the thickness each time; 42 folds would in theory reach the Moon.
What formula does the Paper Thickness Calculator use?
Sheet thickness = stack thickness ÷ number of sheets.