Guitar String Tension Calculator

Frequently Asked Questions

Where do I find the unit weight for my strings?

Major string makers like D'Addario, Ernie Ball, and GHS publish per-string unit-weight tables on their websites. Plug those numbers directly for accurate results.

Why does pitch change tension so dramatically?

Because tension depends on frequency squared: doubling pitch (one octave) quadruples the required tension at fixed gauge and scale length.

How do I balance tension across a string set?

Aim for similar tension across all strings (often 16-20 lb on electric guitar) by adjusting gauges. This calculator lets you test each string individually.

Is high string tension bad for the instrument?

Not inherently - it gives more sustain and punch, but verify the instrument's neck, bridge, and top can handle the total load, especially on archtops and acoustics.

Does scale length affect string tension?

Yes - a longer scale requires higher tension to reach the same pitch with the same gauge. That is why baritone guitars use the same gauges as standard guitars but at a lower pitch.

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Estimates for informational purposes only.

Important Disclaimer: Estimates for informational purposes only.

This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.

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How It Works

String tension determines how a guitar, bass, violin, or piano string feels under the fingers and how much load it puts on the neck and bridge. This calculator uses the classic string-manufacturer formula to find the tension a string must be held at to vibrate at a target pitch, given the instrument's scale length and the string's unit weight (which is determined by its gauge and construction).

The vibrating-string relation is f = (1 / 2L) x sqrt(T / mu). Solving for tension and using the manufacturer's customary units (scale length L in inches, frequency f in Hz, unit weight UW in pounds per inch) gives the widely used form: T = (UW x (2 x L x f)^2) / 386.4 pounds. The constant 386.4 is the acceleration of gravity in inches per second squared.

Results are given in pounds, kilograms-force, and newtons so you can work with any preferred unit system.

Use Cases

String tension calculation is essential for guitarists and luthiers:

Choosing string gauges for a drop or alternate tuning to maintain a comfortable playing feel

Balancing tension across all six strings in a custom set so no string feels unusually tight or slack

Checking total neck load before fitting heavy strings to a vintage or lightweight instrument

Designing a custom guitar scale length to match a target tension at a standard tuning

Comparing how different string constructions (plain vs. wound) affect tension at the same gauge

Tips

Unit weight values are published by all major string makers - use their per-string tables for accurate results.

Tension scales with the square of frequency: tuning up a whole step adds far more tension than it looks.

Down-tuning to get a relaxed feel also reduces sustain and can cause buzzing - try a heavier gauge instead.

Aim for similar tension across strings (often 16-20 lb on electric guitar) for even playing response.

Wound strings of the same diameter as plain strings weigh far more - do not confuse string diameter with unit weight.

FAQ

Where do I find the unit weight for my strings?

Major string makers like D'Addario, Ernie Ball, and GHS publish per-string unit-weight tables on their websites. Plug those numbers directly into the calculator for accurate results.

Why does pitch change tension so dramatically?

Because T depends on f squared: doubling pitch (one octave) quadruples the required tension at fixed gauge and scale length.

How do I balance a string set?

Aim for similar tension across all strings (often 16-20 lb on electric guitar) by adjusting gauges. This calculator lets you test each string individually.

Is high tension bad for the instrument?

Not inherently - it gives more sustain and punch, but verify the instrument's neck, bridge, and top can handle the total load, especially on archtops and acoustics.

Does scale length affect tension?

Yes - a longer scale requires higher tension to reach the same pitch with the same gauge string. That is why baritone guitars use the same gauges as standard guitars but at a lower pitch.

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