Recurve Draw Weight Calculator

Estimate your true draw weight based on your specific draw length.

Draw Weight Analysis

The following chart and table illustrate how draw weight changes in relation to draw length, based on the rated weight you entered.

Estimated Draw Weight at Various Draw Lengths

Draw Length (in)	Estimated Draw Weight (lbs)

What is Recurve Draw Weight?

Recurve draw weight is the amount of force, measured in pounds (lbs), required to pull the bowstring back to a specific point. By industry standard (AMO), this is measured at a 28-inch draw length. However, very few archers have a draw length of exactly 28 inches. This is where the concept of calculating recurve draw weight using draw length becomes critical. Your actual, or “on-the-fingers,” draw weight will be higher if your draw length is longer than 28 inches and lower if it’s shorter. Understanding your true draw weight is essential for proper arrow selection, tuning, and maintaining good shooting form.

A common misunderstanding is that the weight written on the bow’s limbs is what every archer will experience. This is only a baseline. An archer with a 30-inch draw will find a 40 lb bow significantly harder to pull than an archer with a 26-inch draw. Our archery draw weight calculator helps demystify this by providing a close estimate of your personal draw weight.

Recurve Draw Weight Formula and Explanation

While the most accurate method is using a bow scale, a reliable formula provides a very close estimation. The general rule of thumb is that for every inch of draw length difference from the standard 28 inches, the draw weight changes by approximately 2 to 2.5 pounds. For simplicity and consistency, our calculator uses a factor of 2 lbs per inch.

The formula is:

Estimated Draw Weight = Rated Draw Weight + ((Actual Draw Length - Rated Draw Length) * 2)

Formula Variables

Variable	Meaning	Unit	Typical Range
Rated Draw Weight	The weight marked on the bow limbs.	Pounds (lbs)	20 – 60 lbs
Rated Draw Length	The industry standard draw length (AMO).	Inches (in)	28 in
Actual Draw Length	Your personal draw length.	Inches (in)	24 – 32 in
Adjustment Factor	The change in weight per inch of draw length.	lbs / inch	~2.0

Practical Examples

Example 1: Archer with a Longer Draw Length

• Inputs:
  • Rated Bow Weight: 35 lbs
  • Your Draw Length: 30 inches
• Calculation:
  • Draw Length Difference: 30″ – 28″ = +2″
  • Weight Adjustment: 2″ * 2 lbs/inch = +4 lbs
  • Final Result: 35 lbs + 4 lbs = 39 lbs

Example 2: Archer with a Shorter Draw Length

• Inputs:
  • Rated Bow Weight: 40 lbs
  • Your Draw Length: 26.5 inches
• Calculation:
  • Draw Length Difference: 26.5″ – 28″ = -1.5″
  • Weight Adjustment: -1.5″ * 2 lbs/inch = -3 lbs
  • Final Result: 40 lbs – 3 lbs = 37 lbs

How to Use This Recurve Draw Weight Calculator

Using this tool is straightforward. Follow these steps for an accurate estimation:

1. Enter Rated Draw Weight: Find the draw weight written on your recurve bow’s limbs (e.g., “35#” or “35 lbs @ 28”). Enter this number into the first field.
2. Confirm Rated Draw Length: The calculator defaults to 28 inches, which is the industry standard. It’s rare to need to change this.
3. Enter Your Draw Length: Input your personal draw length in inches. If you don’t know it, you can get a good estimate by measuring your wingspan from fingertip to fingertip and dividing by 2.5. For a more precise figure, consider visiting a pro shop or referencing our guide on measuring your draw length.
4. Interpret the Results: The calculator instantly shows your estimated “on-the-fingers” draw weight. The intermediate values show exactly how the calculation was made. The chart and table provide a broader view of how weight scales with length.

Key Factors That Affect Draw Weight

Beyond the simple formula for calculating recurve draw weight using draw length, several physical characteristics of the bow can influence the result. Knowing the best beginner bows can help you start with a manageable setup.

• Limb Material and Design: Limbs made of foam, wood, or carbon composites have different flex profiles. High-performance carbon/foam limbs may have a smoother draw cycle and a slightly different weight gain per inch compared to basic wood/fiberglass limbs.
• Stacking: This is a term for a rapid, non-linear increase in draw weight as the bow is drawn to its maximum. It often occurs when an archer’s draw length is too long for the bow’s design. Choosing a taller bow can help mitigate stacking.
• Riser Length and Limb Geometry: A longer riser with the same set of limbs will generally result in a lower draw weight compared to a shorter riser. This is a key principle in the ILF (International Limb Fitting) system.
• Tiller Bolt Position: Most ILF bows allow you to adjust the tiller bolts, which changes the angle of the limbs in the pocket. Tightening these bolts (turning them in) increases the preload on the limbs, thus increasing the draw weight.
• String Material and Strand Count: While a minor factor, a string with more strands or made from a heavier material can slightly slow the bow down, which can feel like a marginal change in force.
• Brace Height: An incorrect brace height (the distance from the string to the deepest part of the grip) can affect the bow’s efficiency and how the draw force feels, though it doesn’t directly alter the peak weight calculation as much as other factors. For more on this, check out our arrow spine guide.

Frequently Asked Questions (FAQ)

1. How accurate is this calculator?

This calculator uses a widely accepted rule of thumb (±2 lbs per inch) and is very accurate for most conventional recurve bows. However, factors like limb design and “stacking” can cause minor deviations. The most precise measurement always comes from a physical bow scale.

2. What is “AMO Draw Weight”?

AMO (Archery Manufacturers and Merchants Organization, now the Archery Trade Association or ATA) draw weight is the industry standard for measuring bow poundage at a 28″ draw length. This ensures a consistent baseline for comparing bows. You can find more about standards by researching the AMO draw weight standard.

3. My bow “stacks.” How does that affect the calculation?

Stacking is a sudden increase in draw force near full draw. If your bow stacks, the actual draw weight at your full draw length may be higher than what this calculator estimates, as the weight-per-inch gain is no longer linear. This is more common if your draw length is very long for the bow size.

4. Why does my draw weight matter?

Your true draw weight is crucial for selecting the correct arrow spine (stiffness). An improperly spined arrow will not fly straight. It also affects your ability to maintain good archery form basics, as a bow that is too heavy will cause fatigue and bad habits.

5. Can I change my bow’s draw weight?

For takedown recurves, the easiest way is to buy new limbs with a higher or lower rated weight. On ILF bows, you can adjust the tiller bolts to make minor changes (typically ±5%).

6. Does a recurve bow weight vs draw length chart always show a straight line?

For estimations, a linear chart (straight line) is a very good model. In reality, the force-draw curve of a recurve bow is not perfectly linear, but the difference is usually negligible for estimation purposes within a typical range of draw lengths.

7. How do I know what draw weight to start with?

Beginners should always start with a low draw weight to develop proper form. Typically, 20-25 lbs for adult women and 25-30 lbs for adult men is recommended. It’s better to outgrow a light bow than to be injured by a heavy one.

8. Will this calculator work for longbows?

Yes, the principle is the same for most traditional bows, including longbows. The rule of ±2 lbs per inch from the 28″ standard is a reliable estimate for longbows as well.

Related Tools and Internal Resources

Continue your archery journey with our other specialized tools and guides:

• How to Choose a Recurve Bow: A comprehensive guide for new and intermediate archers.
• Arrow Speed Calculator: Estimate how fast your arrows will fly with your setup.
• Measuring Your Draw Length Accurately: A step-by-step guide to finding your true draw length.
• Our Top Picks for Beginner Bows: Get started on the right foot with a reliable and affordable bow.