μμF\mu\mu\text{F}

micromicrofarad

Capacitanceexact by definition

The micromicrofarad is the picofarad under its old name, exactly 1e-12 farads. Prefixes were not stacked in modern SI, but the practice predates it and the marking survives on valve-era schematics, radio service data and older HVAC parts as µµF, mmfd or MMF. The equality is exact, this being a renaming rather than a conversion.

Watch out: Read the context before assuming. On a motor run capacitor, MFD means microfarad, a million times larger than MMFD. The two markings differ by one letter and by six orders of magnitude.

1 μμF\mu\mu\text{F} 0.000001 μF\mu\text{F}

One micromicrofarad in every capacitance unit

1,000femtofarad (fF)
1picofarad (pF)
1micromicrofarad (μμF)this unit
0.001nanofarad (nF)
0.000001microfarad (μF)
1.00000e-09millifarad (mF)
1.00000e-12farad (F)
1.00000e-15kilofarad (kF)