# Bandwidth ↔ rise time calculator

Online calculator for formulas used in electronic circuit design and electrical engineering.

## Basic electric calculations:

Ohm's Law,

Ohm's Law with power,

DC power,

AC real power,

LC resonant frequency,

Capacitor charging/discharging,

Capacitive reactance,

Capacitive current + reactive power,

Capacitor energy,

Capacitor Δ energy,

RC discharging,

Inductor square pulse,

Inductive reactance,

Inductive current + reactive power,

Inductor energy,

2 parallel resistors,

3 parallel resistors,

System bandwidth,

Bandwidth ↔ rise time
## Wire and winding calculations:

## Calculate Bandwidth ↔ rise time: 0.35, 100MHz, ns

This can calculate the oscilloscope rise time (rt) from the bandwidth (BW) or the bandwidth from the rise time.
The factor k (also called a coefficient, constant or multiplier) is typically a number from

0.3 to

0.5.
Traditionally, a

0.35 factor was used.
This works well for a -3 dB bandwidth and a 10-90% rise of a system resembling a simple RC low-pass filter (Gaussian response).
Modern digital oscilloscopes tend to have a much steeper frequency roll-off to prevent aliasing, so a

0.4 to

0.45 factor works better.
BW x rt = k
BW = k / rt
rt = k / BW

### Enter any 2 values, the 3rd one will be calculated:

## Some common probe and oscilloscope bandwidth values:

### Bandwidth ↔ rise time formula says:

•A 100MHz (one hundred megahertz) bandwidth oscilloscope has about 3.5ns (three point five nanoseconds) rise time using a rise time x BW coefficient of 0.35 (zero point three five) for the estimation.

•If the oscilloscope rise time is 3.5ns (three point five nanoseconds), its bandwidth is roughly 100MHz (one hundred megahertz) using a factor of 0.35 (zero point three five).

This is a simple online calculator for formulas used in electronic engineering and design.

This online calculator is for reference only. I do not guarantee it to work correctly. You use this at your own risk only.