Divide a measurement into equal parts
One length. Equal sections.
A measurement for every part.
Enter your total length as the first measurement and the number of equal parts as the second. Division and Number (no unit) are already selected.
Start calculatingTry three equal parts
5 1/4 in ÷ 3
= 1 3/4 in per part
Builder’s calculator
Editing first whole inches
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This divides a length mathematically. It does not automatically subtract saw kerf, material widths, or end clearances.
Divide the length, not the units.
- Enter your total measurement. Choose Feet & inches or a metric unit if that suits your project.
- Keep the second unit as Number (no unit). Enter a positive whole number such as 2, 3, or 4 for the number of parts.
- Read the exact length of each part. Choose a result format or a tape rounding increment if needed.
For example, 5 1/4 inches is 21/4 inches. Dividing by 3 gives 21/12, which simplifies to 1 3/4 inches. Entering 3 inches instead of the number 3 would produce a ratio, not a section length.
Three sections need two inside marks.
If you need four evenly spaced points including both ends, there are three gaps between them. Divide the available span by 3, not 4.
Allow for the material your saw removes.
Equal mathematical sections are different from finished pieces after cutting. For a cutting plan with a known number of cuts, subtract the total kerf first, then divide the usable length by the number of pieces. Extra trimming changes the number of cuts.
For spaces between boards or other objects, subtract their widths and any end clearances before dividing by the number of gaps.
Keep rounding from adding up.
Some divisions do not land exactly on a tape mark. Repeating a rounded spacing can accumulate error. Keep the exact result available, measure marks from a common starting point, and check the final span.
Need to combine lengths first? Use the feet and inches calculator or the fraction calculator for measurements.