String gauges by tuning: what gauge to use for Drop D, Eb, Drop C, and lower

There is one idea behind this whole page, and once you have it the chart reads itself. Strings do not care what note you call them. They care about tension, the amount of pull holding the string taut between the nut and the bridge. Tension is set by three things at once: the gauge of the string, the scale length of the guitar, and the pitch you tune it to. Lower the pitch and you lower the tension, which is why a set that feels perfect in standard turns to spaghetti two steps down.

D'Addario publishes the exact numbers in its String Tension Pro calculator, which returns the pull on any string from its gauge, scale, and pitch. You do not need the calculator to use this page, but it is the reason the page works. When you tune down, you put the lost tension back one of two ways: more mass (a heavier gauge) or more length (a longer scale). On a normal guitar, gauge is the lever you reach for, and the working rule of thumb is to step up roughly one gauge for every whole step you tune below standard. It is an approximation, not a law, but it gets you close before you even pick up the guitar. If the numbers on a string packet are still a mystery, start with our guide to what string gauges mean, then come back here to map them to your tuning.

Here is the whole ladder on a standard 25.5-inch scale, from standard pitch down to the point where a six-string runs out of room. Read down to your tuning, note the gauge range, and grab the set in the next column.

The single most-played rung is the first one, so it is the place to start if you have no strong preference yet. A .010 set in standard covers most players in most genres, which is exactly why it is the best-selling gauge on earth.

The top of the chart is the easy part, because standard tuning and a half step below it both live on the gauges almost everyone already knows. In E standard, a .010 set is the balanced middle of the road, and a .009 set is there if you want the slinkiest feel for fast lead playing. Tune the whole guitar down a half step to Eb, the home of a huge amount of blues and hard rock, and those same tens still work, just a touch looser and warmer. If you want the tension back, or you strum hard, step up to an .011 set. Our E standard and Eb standard guides cover the note layout for each.

Drop the whole guitar a full step to D standard and you have crossed into elevens territory for real. Everything is a whole step low now, not just one string, so a set of elevens keeps the whole instrument from going slack. The two cleanest picks are the Ernie Ball Power Slinky on the nickel side and the D'Addario NYXL1149 on the high-tension side.

This is where the rule starts to bite. A drop tuning lowers your low string further than the rest, so the bottom of the set is doing the most work and needs the most help. Drop D is the gentle one. It moves only the low E down a whole step to D, so a normal .010 set survives. The smart move is a light-top, heavy-bottom set, where a thicker low string keeps the dropped D tight while the top stays fast. The D'Addario NYXL1052 is the textbook example, a .010 to .052 built for exactly this.

Go further and you feel every step. Drop C drops two whole steps, and now a thin low string flaps and smears under gain. This is .011 to .054 territory, the Beefy Slinky zone, where the fat low string finally has the mass to stay punchy. One step lower, to Drop B or C standard, a .054 starts to go slack, so you step up again to .012 to .056, the Not Even Slinky range, about as low as a standard six-string set wants to go. The exact tension targets for these, across Fender, Gibson, and baritone scales, live on our Drop C gauge and tension chart, and the metal-specific deep dive is our down-tuned strings guide.

For the lighter end of Drop C, the Beefy Slinky Cobalt (.011–.054) is the comfortable floor: enough mass for a clean low C, still bendable on top.

There is a point where adding gauge to a six-string just gives you a tuned-down rubber band, and on a 25.5-inch scale that point is right around B. To go lower and stay tight, you need length, not just mass. That means one of two instruments: a seven-string, which adds a heavy low string below your normal six, or a baritone, which stretches the whole scale to 27 inches or more so a normal-feeling gauge holds two or three steps lower.

On a seven-string, the low string is the whole decision. For a standard low B, or a Drop A where only that string changes, a .062 on a 25.5-inch scale lands in the pocket. It is the gauge PRS specifies as the factory string on the Mark Holcomb SVN, the production seven-string most tied to modern prog-metal (PRS Guitars), and it matches the Ernie Ball 7-String Slinky Cobalt, a Regular Slinky top six with a .062 added beneath (Ernie Ball). Our seven-string strings guide and the 7-string gauge guide map the rest of the tunings, and our baritone strings explainer covers the longer-scale route.

Drop tunings all push the same direction: lower, looser, heavier gauge. Open tunings are different, because they retune individual strings up or down rather than dropping the whole guitar, so the tension change depends on which way each string moves. Open G and open D lower a few strings without raising any, so they sit a little looser than standard, and your normal gauge handles them fine. Keith Richards even pulls the low string off entirely and plays open G on five, which is its own kind of tension trick.

The one to watch is open E, which raises the A, D, and G strings to B, E, and G#. That is more tension than standard, not less, and it puts extra strain on the neck if you leave it tuned up for long stretches. Many slide players who love the open E voicing actually tune to open D and clamp a capo at the second fret to get there at lower tension. If you live in open E, a lighter gauge keeps the added pull in check.

Everything above assumes a 25.5-inch scale, the Fender standard on Strats, Teles, and most superstrats. Change the scale and you shift the whole table. A shorter 24.75-inch Gibson scale, on a Les Paul or SG, holds the same gauge at slightly lower tension, so a set feels a touch slinkier than it does on a Fender, and for low tunings you often step up a gauge to compensate. A 27-inch baritone scale does the opposite: it holds more tension at the same pitch, so you can step down a gauge and still feel tight, which is the entire reason baritones exist for low tunings. We pulled the scale-length math apart in our scale length and strings breakout, written around Fender's new 27-inch baritone.

The takeaway is the same one the tension calculator gives you: pitch, gauge, and scale length set the tension together, so if you change one, you adjust another. A low string that feels like a cable wants a lighter gauge or a longer scale. One that flaps and goes sharp when you mute it wants more gauge. The chart is a starting point. Your own hand on your own guitar is the verdict.

Find your tuning in the chart, read across to the set in the next column, and start there. If you are in standard, you are a tens player until proven otherwise, so a Regular Slinky or a NYXL1046 is home base. Tuning down a half or whole step, move to elevens. Living in Drop C or Drop B, jump to the heavier Cobalt sets. Going lower than B, the honest answer is a seven-string or a baritone, not a thicker six-string set.

Two caveats keep this practical. First, a big gauge jump changes the pull on your neck, so after a real step up plan on a setup: a truss-rod tweak, fresh intonation, and a check that the heavier low string seats in the nut slot. Our heavy-gauge install guide walks through it. Second, gauge is about feel and tension, not magic tone, so change one variable at a time and give any new set a couple of weeks before you judge it. The whole catalog, sorted by brand and gauge, lives on our strings index.