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Congestion Charge Calculator

Estimate the daily and monthly cost of driving in a congestion charging zone based on charge days, daily fee and any discounts.

Your Details

Overview

A congestion charge calculator helps you estimate the cost of driving in a charging zone over time. Enter the daily charge, how many days per week you expect to travel, any discount you receive, extra daily fees and the number of months you want to project.

How it works

The calculator starts with the standard daily congestion charge, reduces it by any discount percentage, then adds any extra fees charged per day. It multiplies that adjusted daily amount by the number of charged days per week to estimate a weekly cost, then converts that into a monthly estimate using the average weeks per month. The total period cost is the monthly estimate multiplied by the number of months you enter.

How to use this calculator

  1. 1Enter the standard daily congestion charge.
  2. 2Add how many days per week you expect to be charged.
  3. 3Keep the average weeks per month at 4.33 or adjust it if needed.
  4. 4Enter any discount percentage that reduces the charge.
  5. 5Add any extra fees charged per day.
  6. 6Review the effective daily cost, monthly estimate and total cost for your selected period.

Example Calculation

Daily congestion charge

$15

Charge days per week

5

Average weeks per month

4.33

Discount or exemption reduction

20%

Extra fees per charged day

$0

Number of months

3

Effective daily charge

$12.00

With a daily charge of $15, travel on 5 charged days per week, and a 20% discount, the effective daily charge is $12.00. That gives an estimated monthly cost of about $259.80 and a 3 month total of about $779.40.

Frequently asked questions

What does this congestion charge calculator estimate?

It estimates your effective daily congestion charge, monthly cost and total cost over a selected number of months.

Can I include a resident or other discount?

Yes. Enter your discount as a percentage reduction in the discount field to lower the standard daily charge.

Does this calculator include fines or penalty charges?

No. It estimates standard charges and optional extra daily fees only, not penalties for non-payment or late payment.

Why does the calculator use 4.33 weeks per month?

A typical month averages about 4.33 weeks across a year, which gives a more realistic monthly estimate than using exactly 4 weeks.

Can I use this for any congestion charging zone?

Yes, as long as you know the daily charge and any discount or extra daily fees that apply in that scheme.

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Assumptions and warnings

Assumptions

  • The daily charge stays the same throughout the period entered.
  • Your number of charged days per week is consistent each week.
  • Any discount entered applies equally on every charged day.
  • This estimate does not account for penalties, late payment charges or changes in official pricing.

Warnings

  • This calculator provides an estimate only and is not transport, legal or financial advice.
  • Official congestion charging rules, discounts and fees can change, so check the current scheme before travelling.