Chord library
Jam Trainer's chord library shows the fingering diagram for any chord on the mandolin — pick a root and quality and the shape appears. Then drop it into a chart and play it with a full band, chop and all.
Open the free chord library → Guitar, banjo & mandolin diagrams · no loginCommon mandolin chords (G D A E)
Open the chord library for the exact fingering of each of these — and every other root and quality.
The mandolin is tuned G D A E — the same as a fiddle, in perfect fifths. That even tuning is a gift: a chord shape you learn in one spot slides straight up the neck to give you other chords, so a little knowledge stretches a long way.
For bluegrass, the three you'll reach for constantly are G, C, and D. Learn those and you can back most of the jam repertoire, then add A, E, and the minors as songs call for them.
Mandolin players use two families of shapes. Open chords let strings ring and are great for gentle backup or singing. Chop chords are closed, four-finger shapes with no open strings, so you can clamp and mute them on the backbeat — that percussive "chuck" that drives a bluegrass band like a snare drum.
Because the tuning is all fifths, a closed chop shape is movable: play it two frets higher and the chord name moves up a whole step. So once you own one chop shape, you effectively own it in every key — just slide it to the right fret and the diagrams will confirm the name.