No Login Data Private Local Save

Guitar Action Height Checker – Online Feeler Gauge Sim

Guide Music Tools action guitar setup
10
0
0
0

Guitar Action Height Checker

Online Feeler Gauge Simulator – Measure & Optimize Your String Action

🎯
All strings within recommended range

Your action height looks well-balanced for the selected guitar type.

Frequently Asked Questions

Guitar action height refers to the distance between the bottom of the guitar strings and the top of the frets. It's a critical measurement that affects playability, tone, and comfort. A proper action height allows clean fretting without buzzing while remaining comfortable to press down. Most guitarists measure action at the 12th fret using a feeler gauge or precision ruler.
To measure action with a feeler gauge: 1) Place your guitar on a stable surface in playing position. 2) Fret the string at the 1st fret (or use a capo) to eliminate nut height influence. 3) At the desired fret (typically the 12th), slide feeler gauge blades between the string bottom and the fret top. 4) Start with a thinner blade and work up until you feel slight resistance β€” that's your action reading. This online simulator helps you visualize and compare your measurements against recommended ranges.
For most electric guitars at the 12th fret, ideal action ranges from 1.5mm to 1.8mm (0.059"–0.071") for the high E string and 2.0mm to 2.3mm (0.079"–0.091") for the low E string. Players who favor fast lead playing (shredders) may prefer action as low as 1.2mm on the high E, while blues and slide players often prefer slightly higher action around 2.0mm+ for better sustain and reduced fret buzz.
Acoustic guitars typically require slightly higher action than electrics due to heavier string gauges and greater string vibration amplitude. At the 12th fret, aim for 2.0mm–2.3mm (0.079"–0.091") on the high E and 2.5mm–2.8mm (0.098"–0.110") on the low E. Classical (nylon-string) guitars run even higher β€” approximately 3.0mm on the high E and 3.5mm–4.0mm on the low E at the 12th fret.
High action makes the guitar harder to play β€” you need more finger pressure to fret notes cleanly, which can cause hand fatigue, slow down your playing, and make barre chords painful. It can also cause intonation issues as strings stretch more when pressed down to the fret. However, slightly higher action can provide better sustain, resonance, and reduced fret buzz for aggressive strumming styles.
Action that's too low causes fret buzz β€” the strings vibrate against adjacent frets, producing an unpleasant buzzing sound and killing sustain. Extremely low action can also cause notes to choke out entirely during bends. While low action feels fast and effortless, it requires a very level fretboard and precise setup to avoid buzzing. Most professional setups aim for the lowest possible action without audible buzz.
Action is adjusted through several methods: 1) Truss rod adjustment β€” changes neck relief (curvature), affecting action mainly in the middle frets. 2) Bridge/saddle height β€” on electrics, adjust individual saddle screws; on acoustics, the bridge saddle can be sanded down or shimmed. 3) Nut slot depth β€” filing nut slots deeper lowers action at the first few frets. Always adjust in this order: neck relief β†’ nut height β†’ saddle height. If you're unsure, consult a professional luthier.
A standard automotive feeler gauge set works well. The most useful sizes for guitar setup are: 0.04mm–0.50mm (0.0015"–0.020") for nut slot height, and 0.50mm–3.0mm (0.020"–0.118") for 12th-fret action measurement. Common blades used: 0.10mm, 0.15mm, 0.20mm, 0.25mm, 0.30mm, 0.38mm, 0.50mm, 0.63mm, 0.76mm, 1.0mm, 1.27mm, 1.5mm, 1.75mm, 2.0mm, 2.25mm, 2.5mm. Many luthiers prefer a dedicated string action gauge for convenience.
The 12th fret is the midpoint of the string's speaking length (from nut to bridge saddle). This is where string displacement is greatest when fretting, making it the most representative location for measuring overall action. It's also the industry standard reference point used by guitar manufacturers, luthiers, and setup guides worldwide. Measurements at the 12th fret allow direct comparison with factory specs and setup recommendations.
This online simulator is an educational and reference tool β€” it helps you understand action height concepts, compare your measurements against recommended ranges, and visualize string-to-fret geometry. For actual physical measurements, you still need a real feeler gauge, precision ruler, or dedicated string action gauge. Use this tool to identify whether your measured values fall within the ideal range for your guitar type and playing style. Always verify with physical tools when making adjustments.
Quick Tips for Better Action Setup
  • Always check neck relief (truss rod) before adjusting saddle height.
  • Use a capo at the 1st fret when measuring at the 12th fret for consistent readings.
  • Different playing styles need different action β€” shredders go low, slide players go high.
  • Seasonal humidity changes can affect neck relief and action β€” re-check periodically.
  • When in doubt, take your guitar to a qualified luthier for a professional setup.
πŸ”§ Related Tools