Recurve Bow Size Calculator
Choosing the correct bow size is crucial for comfort, accuracy, and enjoyment in archery. This recurve bow size calculator helps you find the ideal bow length based on your body’s measurements.
Measure from fingertip to fingertip of your outstretched arms. Stand straight and have a friend help you for the best accuracy.
Estimated Draw Length: 28.00″
Basis: Standard 25″ Riser with Medium Limbs
Formula Used: Draw Length is estimated as Arm Span / 2.5. Recommended Bow Length is then determined based on standard AMO charts for optimal performance.
Chart comparing your recommended bow length to standard available sizes.
| Draw Length (inches) | Recommended Bow Length (inches) |
|---|---|
| 23″ – 25″ | 64″ – 66″ |
| 25″ – 27″ | 66″ – 68″ |
| 27″ – 29″ | 68″ – 70″ |
| 29″ – 31″ | 70″ – 72″ |
| 31″+ | 72″+ |
This recurve bow size chart provides general recommendations. Your final choice may depend on riser/limb combinations and shooting style.
What is a Recurve Bow Size Calculator?
A recurve bow size calculator is a specialized tool designed to recommend the appropriate length of a recurve bow based on an archer’s physical characteristics, primarily their draw length. Unlike one-size-fits-all equipment, archery gear must be properly fitted to the user for optimal performance, safety, and comfort. Using a bow that is too short can cause “stacking” (a rapid increase in draw weight) and finger pinch, while a bow that is too long can be inefficient and unwieldy.
This calculator is essential for everyone from beginners to competitive archers. A beginner using a correctly sized bow will find it easier to develop proper form, leading to a more enjoyable learning experience. For an expert, a precisely matched bow ensures maximum efficiency and accuracy, which is critical in competitive settings. A common misconception is that bow size is based on an archer’s height, but the primary determining factor is actually draw length, which is directly related to arm span.
Recurve Bow Size Formula and Mathematical Explanation
The core of any recurve bow size calculator is a two-step process: first determining the archer’s draw length, and then matching that draw length to a standard bow length.
- Step 1: Calculate Draw Length. The most common and reliable method to estimate draw length without specialized equipment is the arm span method. You measure the person’s arm span from fingertip to fingertip and divide by 2.5.
- Step 2: Determine Bow Length. Once the draw length is known, it is compared against standardized charts provided by the Archery Manufacturers Organization (AMO). These charts provide a recommended bow length that ensures the bow operates at peak efficiency for that specific draw. For example, a 28″ draw length typically pairs well with a 68″ bow.
The formula for the first step is: Draw Length = Arm Span / 2.5
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Arm Span | Distance from fingertip to fingertip of outstretched arms | Inches | 60″ – 80″ |
| Draw Length | Distance from the nock point to the grip at full draw | Inches | 24″ – 32″ |
| Bow Length | Total length of the bow from tip to tip (AMO) | Inches | 62″ – 72″ |
Variables used in the recurve bow size calculator.
Practical Examples (Real-World Use Cases)
Example 1: Average Adult Male
An adult male measures his arm span at 71 inches. Using the recurve bow size calculator, his estimated draw length is 71 / 2.5 = 28.4 inches. Based on the standard sizing charts, an archer with a draw length between 27″ and 29″ is best suited for a 68″ or 70″ bow. He decides on a 68″ bow, which is a very common and versatile size, perfect for target archery.
- Input (Arm Span): 71 inches
- Intermediate Value (Draw Length): 28.4 inches
- Output (Recommended Bow Length): 68 inches
Example 2: Youth Archer
A young archer has an arm span of 63 inches. The calculator determines her draw length to be 63 / 2.5 = 25.2 inches. For a draw length in the 25″ to 27″ range, a 66″ bow is the recommended size. This size will provide a smooth draw and prevent the discomfort that would come from a bow that is too large or too small, allowing her to focus on her form. For more information, you might check an archery safety rules guide.
- Input (Arm Span): 63 inches
- Intermediate Value (Draw Length): 25.2 inches
- Output (Recommended Bow Length): 66 inches
How to Use This Recurve Bow Size Calculator
Using this calculator is a straightforward process designed to give you an accurate recommendation quickly.
- Measure Your Arm Span: Stand up straight with your arms extended out to your sides, parallel to the floor. Have someone else measure the distance from the tip of your middle finger on one hand to the tip of your middle finger on the other. Enter this value in inches into the input field.
- Calculate: Press the “Calculate Size” button. The tool will automatically compute your estimated draw length and then suggest the most appropriate recurve bow length.
- Review the Results: The primary result is your recommended bow length. You’ll also see your calculated draw length, which is useful information to know for other aspects of archery, like selecting the correct arrows. The calculator also suggests a common riser/limb combination to achieve that size.
- Decision-Making: Use this recommendation as your starting point. If you are between sizes, a longer bow is often more forgiving and smoother to shoot. Consider consulting our bow tuning guide for further adjustments.
Key Factors That Affect Recurve Bow Size Results
While a recurve bow size calculator provides an excellent starting point, several factors can influence the final decision. Understanding these can help you fine-tune your choice.
- Draw Length: This is the most critical factor. An accurate measurement is paramount for getting a correct bow size recommendation. An incorrect draw length will lead to an ill-fitting bow.
- Archer’s Height: While not the primary factor, height often correlates with arm span. However, some people have longer or shorter arms relative to their height, which is why arm span is a more accurate metric.
- Riser Length: Modern recurve bows are takedown models with a central riser and two limbs. Risers typically come in 23″, 25″, and 27″ lengths. A longer riser with shorter limbs can result in the same total bow length as a shorter riser with longer limbs, but they will feel different to shoot. A 25″ riser is the most common standard.
- Limb Length: Limbs come in short, medium, and long sizes. The combination of riser and limb length determines the final bow size (e.g., 25″ riser + medium limbs = 68″ bow). Longer limbs generally provide a smoother draw.
- Shooting Style: The intended use matters. Olympic recurve archers typically prefer longer, more stable bows (68″-72″). Barebow or field archers might prefer slightly shorter bows for maneuverability.
- AMO Standard: The Archery Manufacturers Organization (AMO) standard provides the guidelines for measuring bow length. This ensures consistency across different brands, making our recurve bow size calculator a reliable tool.
Frequently Asked Questions (FAQ)
What if I am between two bow sizes?
If your draw length puts you on the cusp of two sizes, it is generally recommended to choose the longer bow. A longer bow tends to be more forgiving, stable, and provides a smoother draw experience, which is beneficial for consistency.
Can I use my height instead of arm span for the calculator?
It is not recommended. While there is a general correlation, arm span is a much more direct and accurate measurement for determining draw length. People of the same height can have significantly different arm spans, so using a what size recurve bow do i need guide based on height can be misleading.
Does the brand of the bow affect the size I need?
Generally, no. Most manufacturers adhere to the AMO standards for bow and limb length. A 68″ bow from one brand should be the same length as a 68″ bow from another. However, the geometry of the riser and limbs can make them feel slightly different.
How does riser length change the bow?
A longer riser generally adds mass weight and stability to the bow, which is why they are popular in target archery. A 25″ riser is standard, while 27″ risers are used by very tall archers with long draw lengths, and 23″ risers are for shorter archers or youths. Check a guide on olympic recurve bow setup for more details.
Is this recurve bow size calculator suitable for compound bows?
No. Compound bows have a completely different sizing mechanism based on their cam system and let-off. They are measured by draw length range and are not selected based on an overall bow length in the same way as recurve bows.
What happens if my bow is too short?
A bow that is too short for your draw length will “stack.” This means the draw weight increases dramatically and non-linearly at the end of the draw, making it harsh and difficult to pull. It also increases the string angle, causing “finger pinch,” which can be uncomfortable and affect your release.
How do I know my draw length is correct?
The arm-span-divided-by-2.5 method is a very reliable estimate. The most precise way is to be measured at an archery pro shop using a special measuring arrow. They can confirm the result from our recurve bow size calculator.
Does bow length affect arrow speed?
Yes, but it’s a complex relationship. For a given draw weight and draw length, a shorter bow with more aggressive limbs might be slightly faster but less forgiving. A longer bow is typically smoother and more stable, which often leads to better accuracy for the archer, outweighing any minor speed differences.