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The amplification factor, also called gain, is the extent to which an analog amplifier boosts the strength of a signal. Amplification factors are usually expressed in terms of power. The decibel (dB), a logarithmic unit, is the most common way of quantifying the gain of an amplifier.

In general an amplification factor is the numerical multiplicative factor by which some quantity is increased.

• In structural engineering the amplification factor is the ratio of second order to first order deflections.

• In electronics the amplification factor, or gain, is the ratio of the output to the input of an amplifier, sometimes represented by the symbol AF.

• In numerical analysis the amplification factor is a number derived using Von Neumann stability analysis to determine stability of a numerical scheme for a partial differential equation.

• "Developments in Tall Buildings 1983". ISBN 0-87933-048-1. Page 489.

• "Numerical Computation of Internal & External Flows". ISBN 978-0-7506-6594-0. Page 296.