Draw length is how far you pull the bowstring back at full draw. A bow set to the right draw length is more accurate and comfortable, and reduces the risk of shoulder strain.
How to use the Draw Length Calculator
- Wingspan (arm span)
Results update as you type, and every field accepts the units shown in its menu.
How it works
Stand with your back to a wall, arms outstretched and palms forward, and measure from the tip of one middle finger to the other. Divide by 2.5 to get the draw length; arrows are usually cut 1–2 inches longer for safety.
What each result means
- Draw length = [Wingspan (arm span)]÷2.5
- Suggested minimum arrow length = [Draw length] + 2.54
Example values
How the main result changes when Wingspan changes and everything else stays at the example values above:
| Wingspan (arm span) (cm) | Draw length (cm) |
|---|---|
| 89 | 35.6 |
| 133.5 | 53.4 |
| 178 | 71.2 |
| 222.5 | 89 |
Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.
Formula
Draw length (in) = wingspan (in) ÷ 2.5
Arrow length ≈ draw length + 1 to 2 in
Worked example
Inputs — Wingspan (arm span): 178 cm.
Results — Draw length = 71.2 cm; Suggested minimum arrow length = 73.7 cm.
Key terms
- Draw length
- Distance from the nocking point to the grip plus 1.75 in at full draw (AMO standard).
Frequently asked questions
Why divide by 2.5?
It is a long-standing rule of thumb that matches measured draw lengths for most archers within about an inch.
Is draw length the same for compound and recurve bows?
The body measurement is the same, but compound bows are set to a fixed draw length.
What if I am between sizes?
Choose the shorter length; overdrawing hurts accuracy.