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A series of useful formulae for the electronics engineer:-

Formula - PPM/DegC

Calculate the change in value of any nominal value (voltage etc) for every degC change.
Note: % = ppm / 10000
Nominal Value:
PPM:
Tested range degC:
Result: Variation per degC:
Result: Variation across tested temp range:

Formula - PPM

Calculate the voltage deviation/ppm based on the given inputs.
Note: 1 ppm = 0.0001%
Nominal Voltage (V):
PPM:
Voltage Deviation (V):
Voltage Deviation (µV):
Voltage Deviation (nV):

Formula - Op-Amp Gain (inverting)

Rf Ohm:
Rin Ohm:
Gain:

Formula - Op-Amp Gain (non-inverting)

Rf Ohm:
R3 Ohm:
Gain:

Formula - Time / Hz

Convert Time & Frequency.
Freq Hz:
Period mS:
Period mS:
Freq Hz:

Formula - mm to mils

mils to mm / mm to mils.
mm
mils

Formula - Parallel Resistors

R1: R2:
R3: R4:
R5: R6:
R7: R8:
Total Resistance:

Formula - Voltage Divider

Input.V:
R1 Ohm:
R2 Ohm:
Output.V:

Formula - LM317

Fill in the two resistor values(ohms) to compute the output voltage.
R1 resistor:
R2 resistor:
Output.V:

Formula - Ohms Law

Fill in any TWO numeric values and I'll give you all FOUR.
Volt:Ohm:
Amp: Watt:

Formula - Zener Diode

Max Input: Volts
Min Input: Volts
Output: Volts
Load: mA
Results:
Resistor - Ohms
Resistor - Watts
Zener - Volts
Zener - Watts