Embedded CAN frame bandwidth calculator

Calculate frame bit estimates including intermission and estimated bus load with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use frame bit estimates including intermission and estimated bus load to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Classic CAN frames [payload bytes,frames per second,extended ID 0/1]
[[8,100,0],[4,50,1]]
CAN bitrate (bits/s)
500000
Stuffing: 0 none; 1 conservative worst-case bound
1
Frame bit estimates including intermission
[135,120]
Estimated bus load (%)
3.9

Try another scenario

Classic CAN frames [payload bytes,frames per second,extended ID 0/1]
[[8,100,0],[4,50,1]]
CAN bitrate (bits/s)
250000
Stuffing: 0 none; 1 conservative worst-case bound
1
Frame bit estimates including intermission
[135,120]
Estimated bus load (%)
7.8
Calculation method

Calculation method

Frame bit estimates including intermission

Standard baseline47+8payload; extended67+8payload; conservative stuffing bound floor((stuffable−1)/4).

Estimated bus load (%)

Sum frame bits×rate / bitrate ×100.

Symbols and units
a
Classic CAN frames [payload bytes,frames per second,extended ID 0/1]
b
CAN bitrate (bits/s)
c
Stuffing: 0 none; 1 conservative worst-case bound

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Classic CAN data frames only (0–8 payload bytes), no CAN FD, remote frames, errors or retransmission. Stuffing is an explicit upper-bound estimate; not an exact encoded bitstream. Quantities are deterministic calculations from supplied observations and assumptions; no external data is fetched. Supported limits: Finite inputs only; numeric fields bounded as labelled. Lists and JSON records are limited to 256 entries unless a stricter tool bound is stated. No automatic design approval, legal conclusion, treatment recommendation or safety certification. CAN bitrate (bits/s): minimum 1e-12, maximum 1000000000000.0. Stuffing: 0 none; 1 conservative worst-case bound: minimum 0, maximum 1.
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