Speeding Fine Calculator
Enter the speed limit and recorded speed to check the court guideline band. Add weekly income for an illustrative starting fine.
How the Calculator Works
The calculator uses the Sentencing Council's guidelines to determine which fine band applies using the official recorded-speed table for each speed limit. It then applies the relevant weekly-income range and statutory fine cap.
Thresholds vary by posted limit. For example, in a 30 mph limit Band A covers 31–40 mph, Band B 41–50 mph and Band C 51 mph or above. The fine ranges are 25–75%, 75–125% and 125–175% of relevant weekly income respectively.
Some forces use the commonly cited range from the limit + 10% + 2 mph to the limit + 10% + 9 mph when considering a speed awareness course. It is guidance, not an entitlement: the police decide whether to offer a course and local policy can vary.
Frequently Asked Questions
How accurate is this speeding fine calculator?
It applies the Sentencing Council recorded-speed table for England and Wales. It cannot predict whether police will offer a course or fixed penalty, or how a court will adjust a sentence.
What is the NPCC prosecution threshold?
The National Police Chiefs' Council (NPCC) guideline suggests prosecution for speeding at the speed limit plus 10% plus 2 mph. For example, in a 30 mph zone, the threshold is 35 mph. This is a guideline only and police forces have discretion to prosecute at any speed above the limit.
Does the calculator account for speed awareness course eligibility?
It shows the commonly used course range between the limit + 10% + 2 mph and the limit + 10% + 9 mph. A course is discretionary and GOV.UK says it may be offered where police consider it appropriate and you have not attended one in the previous three years.