Guitar String Tension Calculator
Calculate guitar string tension from scale length, pitch frequency, and string unit weight for balanced string sets.
What Is Guitar String Tension?
Guitar string tension is the pulling force required to tune a string to a target pitch. Scale length, string unit weight, and vibrating frequency all affect how tight a string feels under your fingers.
Guitar String Tension Formula
The tension in pounds follows the wavelength relationship:
$$T = (f \times 2L)^2 \times \frac{\mu}{g}$$
Where $f$ is frequency in Hz, $L$ is scale length in inches, $\mu$ is unit weight in lb/in, and $g$ is gravitational acceleration expressed in in/s².
Use the BPM Calculator for tempo work and the Chord Finder to identify chords from note sets.
Frequently Asked Questions
How do I calculate guitar string tension?
Multiply scale length by 2 and by the target frequency, square the result, multiply by string unit weight in lb/in, then divide by 386.09 in/s² to get tension in pounds.
What is a typical string tension range?
On a 25.5-inch guitar with medium strings, individual string tensions often fall between 16 and 20 pounds at standard tuning.
How can I reduce string tension?
Use lighter gauge strings, tune down, or switch to a shorter scale length guitar to lower the required pull force.
What are balanced-tension strings?
Balanced-tension sets are chosen so each string has similar pull force, which can make barre chords and bends feel more even across the neck.
Does scale length affect tension?
Yes. Longer scale lengths require more tension to reach the same pitch with the same string gauge.