Mandolin Tuning Calculator - Standard, Cajun and Cross Tuning Notes

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What mandolin tuning means

A mandolin has four courses, each a pair of strings tuned in unison, for eight strings in total. Standard tuning, from the lowest course to the highest, is G, D, A, E, in fifths, exactly like a violin. That fifth-based layout is why mandolin chord shapes move so logically across the neck: the same shape works in any key by moving it. This tool gives the note and frequency of every course for standard and alternate tunings, so you can retune with a chromatic tuner and know each course is right.

How to use the calculator

Pick a tuning. The table lists the four courses from low to high, with the note and frequency of each. Tune both strings of each course to the same note, checking them against each other: a course with its two strings slightly apart sounds chorus-like at first, then simply out of tune. Tune the low course first and work upward, then recheck the low course, because changing tension moves the neck a little. If a tuning raises a course, approach the note slowly from below.

Standard tuning first

Standard GDAE covers bluegrass, folk, classical, and most of the music a beginner will meet. Its fifths layout means scales fall under the fingers in a regular pattern, and violin music transfers directly. Most method books and tabs assume standard tuning. Before you explore alternate tunings, be fluent in standard: alternate tunings are tools for particular tunes, not replacements for the home base. Players who skip standard tuning often struggle later, because every alternate tuning is described relative to it.

Cajun tuning

Cajun tuning is F, C, G, D: every course one whole step below standard. It exists to play with C accordions, the traditional Cajun accordion key, while fingering as if in D or G. The lower tuning also gives a darker, more resonant sound that suits Cajun waltzes. If you play Cajun music with accordion players, this tuning is not optional decoration: it is how the instruments sit together. For solo practice it is still worth trying, because the lower tension changes the mandolin feel noticeably.

Cross tunings and Celtic tuning

Cross tunings retune courses to create open-string drones. Cross A is A, E, A, E: the low course rises to A and the D course rises to E, which suits tunes in A. Cross G, also called sawmill tuning, is G, D, G, D: the A course drops to G and the E course drops to D, giving a doubled G drone. GDAD, the Celtic tuning, is G, D, A, D: only the top course drops, which gives a high D drone for Irish and Scottish tunes. ADAD and ADAE are neighbouring cross tunings for D tunes, each keeping a different top string. Open G, G, D, G, B, suits blues and slide playing, with an open G chord across the courses.

Choosing a tuning for a tune

Start in standard tuning. If a tune needs an open-string drone that standard tuning cannot give, or if a source recording was made in a cross tuning, switch for that tune and switch back after. Keep a note of which tunes need which tuning, grouped by tuning, so a set does not force constant retuning. Check tuning before every practice session and performance: mandolins go out of tune quickly with temperature and humidity changes, and a course with one string out sounds worse than a single string out. Small, regular tuning checks beat long, frustrated retuning sessions.

Strings and setup for alternate tunings

Alternate tunings change string tension, so string choice matters. A course tuned up a whole step, like the low course in Cross A, feels tighter and can break sooner if the strings are old. A course tuned down, like the top course in GDAD, feels looser and may buzz on low frets. If you use one alternate tuning often, ask a luthier about string gauges that balance tension across the courses. A small setup adjustment for your main alternate tuning beats fighting buzz and breakage.

Mandolin Tuning Calculator – Standard, Cajun and Cross Tuning Notes