Arrows (spine)
Calculate Arrows (spine) instantly with the exact formula and a worked example.
Arrows (spine)
Measured deflectionmm
Test weightg
Span between supportsin
Spine (ASTM)
500
Standard deflection
12.7mm
More about: Arrows (spine)
What it calculates
The “Arrows (spine)” calculator computes Spine (ASTM) from 3 parameters: measured deflection (mm), test weight (g), span between supports (in).
A handy everyday calculator for daily tasks.
Example calculation
With parameters Measured deflection = 12.7 mm, Test weight = 880 g, Span between supports = 28 in the result is 500 (The higher the number, the weaker (more flexible) the arrow).
How to use
- Enter measured deflection, test weight and span between supports — each field above is adjustable with a slider.
- Spine (ASTM) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Arrows (spine) calculated?
The Arrows (spine) calculator computes Spine (ASTM) from measured deflection, test weight, span between supports. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Arrows (spine) calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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