Speeding Fine Calculator

Work out speeding fine instantly with clear inputs, formula shown and shareable results.

About Speeding Fine Calculator

Most jurisdictions band speeding by the percentage over the limit rather than the absolute excess, because 20 km/h over in a 30 zone is far more dangerous than in a 110 zone. This models a base fine plus a per-km/h escalation with the usual three severity bands.

Formula

Speeding fine

fine = base + excess x rate per km/h; severity from the percentage over the limit

Worked example

With the default values below, Speeding Fine Calculator returns Estimated fine of $264.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Speed limit: 50 km/h
Recorded speed: 68 km/h
Base fine: 120
Additional fine per km/h over: 8

Results

Estimated fine: $264.00
Excess over the limit: 18.00 km/h
Percentage over the limit: 36.0% %
Severity band: Band B - moderate

Step by step

1Values used
2Speeding fine
3Estimated fine= 264.00
4Excess over the limit= 18.00 km/h
5Percentage over the limit= 36.0 %
6Severity band= Band B - moderate

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why band by percentage?

Because risk scales with the relative excess. In the UK, bands A, B and C correspond to roughly 1-20%, 20-45% and over 45% above the limit.

Are fines income linked?

In many countries yes. The UK bands fines as a percentage of weekly income, and Finland and Switzerland scale them to total income without a cap.