String tension is the pulling force each string exerts on the ukulele's neck and bridge when tuned to pitch. Proper tension ensures comfortable playability, stable intonation, and reduces unnecessary stress on the instrument. Too little tension makes strings feel floppy and buzz-prone; too much makes fretting difficult and can potentially warp the neck over time.

For most nylon-string ukuleles, an ideal per-string tension falls between 1.5–5 lbs (7–22 N), with a total tension of 8–18 lbs (35–80 N). Soprano ukuleles typically sit at the lower end, while tenor and baritone models can handle slightly higher tensions. Fluorocarbon strings generally produce higher tension than nylon at the same gauge due to their higher density.

High G (re-entrant) tuning uses a thin gauge for the 4th string tuned to G4 (392 Hz), keeping tension low at around 1.5–3 lbs. Low G (linear) tuning drops the 4th string to G3 (196 Hz) but requires a significantly thicker gauge (often wound or thick fluorocarbon) to maintain adequate tension — typically 2.5–5 lbs. Both are perfectly valid; it's about tonal preference and playing style.

Tension increases with the square of scale length. This means a tenor ukulele (17") with the same strings and tuning will have roughly 70% more tension than a soprano (13"). That's why tenor sets often use slightly thinner gauges to compensate. Baritone ukuleles (19") with their longer scale and lower DGBE tuning balance this relationship differently.

Nylon (density ~1.10 g/cm³) is the traditional choice — warm tone, lower tension, affordable. Fluorocarbon (~1.78 g/cm³) is denser, producing higher tension at the same gauge, with brighter tone and better tuning stability. Nylgut (~1.25 g/cm³) by Aquila sits between them, offering balanced warmth and projection. The "best" material depends on your tonal preference, playing style, and desired tension feel.

Absolutely! Select your desired note for each string using the dropdown menus, adjust the gauge and material, and the calculator will instantly compute the resulting tension. This is especially useful for experimenting with slack-key tunings, open tunings, or adapting strings across different ukulele sizes.

A balanced set means all four strings have similar tension, providing consistent feel across the fretboard. Ideally, tensions should be within 1–2 lbs of each other. Use the bar chart to visualize balance — bars of similar height indicate a well-balanced set. Adjust individual gauges or materials to fine-tune.