🏹 拉距计算器（臂展法，英寸与厘米）Draw Length Calculator (Wingspan Method, Inches & cm)

使用说明与常见问题How-to & FAQ

「拉距计算器（臂展法，英寸与厘米）」是什么？What is the Draw Length Calculator (Wingspan Method, Inches & cm) tool?

用射箭常用的臂展法估算拉距：拉距 ≈ 臂展 ÷ 2.5，支持英寸和厘米，并给出建议的箭长范围。只是起点，最好在弓店实际测量。本地处理。Estimate your archery draw length with the common wingspan method, draw length ≈ wingspan ÷ 2.5, in inches or cm, with a suggested arrow length range. It is a starting point; a pro shop measurement is best. Processed locally.

如何使用「拉距计算器（臂展法，英寸与厘米）」？How do I use the Draw Length Calculator (Wingspan Method, Inches & cm) tool?

在「拉距计算器（臂展法，英寸与厘米）」中，填写「臂展（双臂平伸，中指尖到中指尖）」、「单位」等参数，结果会随输入实时计算并显示在下方。In the Draw Length Calculator (Wingspan Method, Inches & cm): Fill in "Wingspan (arms out, fingertip to fingertip)", "Unit"; results are recalculated instantly as you type.

怎么量臂展？How do I measure my wingspan?

背靠墙站直，双臂向两侧平伸、手掌朝前，不要用力拉伸，请别人量两只手中指尖之间的距离。Stand straight with your back to a wall, arms out to the sides at shoulder height, palms forward and not overstretched, and have someone measure from one middle fingertip to the other.

臂展除以 2.5 准吗？How accurate is wingspan ÷ 2.5?

这是射箭界最常用的估算方法，多数人误差在 1 英寸以内。肩宽、站姿和用不用释放器都会有影响，最准确的方法是在弓店拉一张测量弓。It is the most widely used estimate and is usually within an inch. Shoulder width, stance and whether you shoot with a release aid all play a part; the most accurate way is to draw a measuring bow at a pro shop.

箭要多长？How long should my arrows be?

通常比拉距长 1–2 英寸，这样满弓时箭头还在弓的前方，比较安全。具体长度还要看弓型和箭台。Usually 1–2 in longer than your draw length, so the point stays in front of the bow at full draw for safety. The exact length also depends on the bow and arrow rest.

能举个计算实例吗？Can you show a worked example?

例如在「拉距计算器（臂展法，英寸与厘米）」中填 臂展（双臂平伸，中指尖到中指尖） = 70，单位 = 英寸，结果区显示：拉距（臂展 ÷ 2.5）：28 in（71.1 cm）；按半英寸取整：28 in；建议箭长：29–30 in；ℹ 按 AMO 标准拉距估算；复合弓的拉距通常按半英寸调节，误差 ±1 英寸都会明显影响射箭姿势For example, entering Wingspan (arms out, fingertip to fingertip) = 70, Unit = inches in the Draw Length Calculator (Wingspan Method, Inches & cm) gives: Draw length (wingspan ÷ 2.5): 28 in (71.1 cm); Rounded to the nearest ½ in: 28 in; Suggested arrow length: 29–30 in; ℹ an estimate of AMO draw length; compound bows usually adjust in ½ in steps, and being 1 in off noticeably changes your form

哪些输入会被检查？Which inputs are validated?

「拉距计算器（臂展法，英寸与厘米）」会检查这些输入——「臂展（双臂平伸，中指尖到中指尖）」：必须填写，须大于 0；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Draw Length Calculator (Wingspan Method, Inches & cm) checks its inputs — "Wingspan (arms out, fingertip to fingertip)": required, must be greater than 0; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.

有哪些选项可以调整？What options can I adjust?

「拉距计算器（臂展法，英寸与厘米）」的设置：「臂展（双臂平伸，中指尖到中指尖）」默认 70；「单位」可选 英寸、厘米（默认 英寸）。每次生成结果都按当前设置处理。Settings in the Draw Length Calculator (Wingspan Method, Inches & cm) — "Wingspan (arms out, fingertip to fingertip)" default 70; "Unit": inches, cm (default inches). The result always uses the current settings.

手机上能用吗？Does it work on mobile?

可以。「拉距计算器（臂展法，英寸与厘米）」支持触屏操作，在手机和平板浏览器中均可使用，无需安装 App。Yes. The Draw Length Calculator (Wingspan Method, Inches & cm) supports touch input and works in mobile and tablet browsers without installing an app.

「拉距计算器（臂展法，英寸与厘米）」免费吗？需要注册吗？Is the Draw Length Calculator (Wingspan Method, Inches & cm) free? Do I need an account?

「拉距计算器（臂展法，英寸与厘米）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Draw Length Calculator (Wingspan Method, Inches & cm) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.