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Power calculator·2026 · OCT

01Bench tool

Pedalboard power supply calculator

Will your board run on that supply? Add your pedals, choose your power supply, and get the draw, the headroom and a jack-by-jack verdict.

Power draw for 211 pedals12 supplies, jack by jack

02The board

Search for each pedal by name, or pick it by type, brand and model. Draw and voltage fill in from our pedal power draw database of typical published figures. Type your own number for anything not listed, or to match the label on your unit.

Example board. A tuner, a compressor, an overdrive, a distortion, a delay and a reverb, so you can see a verdict right away. Clear it and build yours.

Your first pick replaces the example board.

Truetone 1 SPOT293mA of 1700mA

Runs, with a catch on the Truetone 1 SPOT. See the full verdict.

03The verdict

Runs, with a catch

It will power up. Read the notes before you commit.

Draw
293mA
Available
1700mA
Headroom
1407mA (82.8%)
Outputs
6 pedals on 1 daisy-chain output
  • Boss DD-8 Digital Delay and Boss RV-6 Reverb share a ground with the rest of the board on this supply. Digital pedals (most delays, reverbs, pitch and loopers) and pedals over 100mA want their own isolated jack, and on a shared ground they are the usual source of hum. 2 isolated outputs should remove it.

A single 9V jack rated 1700mA, split out with a daisy-chain cable. Every pedal on the chain shares one ground, which is where daisy-chain hum comes from. Manufacturer spec · Jack-by-jack page

04What fits

Every supply we have specs for, best fit first. Ties go to the smaller unit, not the pricier one. Compare them jack by jack.

05Share or keep it

Anyone with the link opens this board, with its voltages and draws, on this supply. No account needed.

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06How it figures

Draw and voltage come from our database of 211 pedals, each listed at its typical published current draw at its own voltage: 9V unless the maker specifies another, such as the 18V MXR Uni-Vibe. Type in anything not listed, or the figure printed on your own unit. A pedal with no figure counts as unknown rather than as zero, so the total reads as a floor instead of a false total. Passive volume pedals take no jack, and a pedal that runs from its own adapter stays out of the supply’s totals.

Supply capacity is summed from each unit’s per-jack table, transcribed from 12 manufacturers’ published specs. We do not use the headline “combined mA” figures: one of them counts an AC outlet that cannot power a DC pedal, and more than one does not add up. See every supply jack by jack.

Fit is checked per jack. Every pedal is matched to a jack that offers its voltage and carries its draw at that voltage, smallest sufficient jack first, so the big and switchable jacks stay free for the pedals that need them. A board fails on jacks only when no wiring of it exists, and the verdict names the pedals and the jacks they compete for. Jacks that switch to 12V or 18V on a fixed wattage are read at their rating for that voltage: the Strymon Zuma’s switchable jacks give 500mA at 9V and 250mA at 18V.

Digital pedals (most delays, reverbs, pitch and loopers) and anything drawing over 100mA are flagged for an isolated output, because on a shared ground they are what brings the hum. Analog bucket-brigade delays such as the Boss DM-2W are not flagged.

Before you plug in, check each pedal’s label for its voltage and polarity. Most run on 9V center negative, and a pedal fed the wrong voltage or polarity can be damaged.

07Keep reading