Florida Prejudgment Interest Calculator
Use my free tool below to calculate prejudgment interest using the official Florida interest rates established by its Chief Financial Officer. Enter the Amount of Loss, the Date of Loss, and the Through Date. Then, hit Calculate. You can even print the results in PDF format.
Frequently Asked Questions
What is the purpose of prejudgment interest?
Prejudgment interest is meant to make the prevailing party whole from the date of the loss once the amount of damages have been determined. It compensates the successful party for the loss of the use of money between the date the party was entitled to it and the date of judgment.
Who is this prejudgment calculator for?
If you’re entitled to prejudgment interest in Florida, this calculator is designed to help save time when performing those calculations. Prejudgment interest is often miscalculated or calculated inconsistently. My goal is for this calculator to be a helpful tool for everyone; however, you should independently verify the results for your specific case.
Is there a specific formula to calculate prejudgment interest?
My calculator takes the official quarterly rate at the time of your loss and keeps that same rate through the end date.
In the past, I’ve been uncertain on the proper way to calculate prejudgment interest. Originally, I assumed that Fla. Stat. § 55.03 applied, so that prejudgment interest would be established by the quarterly rate at the time and adjust each year on January 1. However, a recent 4th DCA case made it clear that the statute does not apply since that statute applies to judgments, not prejudgment interest. Michelis v. Nugent, 2025 WL 1318634, at 4 (Fla. 4th DCA May 7, 2025) (“However, section 55.03 applies to judgments. See Genser, 100 So. 3d at 762. Prejudgment interest is a matter of court-made law, not the application of section 55.03, and should be calculated using the statutory interest rate in effect when the court determines a party is entitled to attorney’s fees.”).
My interest rates are taken from the Florida Department of Financial Services’ website: https://www.myfloridacfo.com/division/aa/audits-reports/judgment-interest-rates. Note: I use their official “Daily Rate as a Decimal”, which they round to nine decimal places. Using this number instead of the “Rate per Annum” may yield very minor differences due to rounding, but in my opinion, it is proper to use their daily rate as a decimal.
My calculator rounds the final prejudgment interest to two decimal places.
The formula uses (Amount of Judgment) x (“Daily Rate as a Decimal” in the quarter of the date of loss) x (Number of Days of Interest).
Does the calculator apply to all Florida prejudgment interest?
No, if you have a contractual dispute, for example, the contract may specify a different interest rate to be used.
You also want to ensure that prejudgment interest applies to your claim at all. For example, oftentimes, it is not awarded in tort cases since damages are too speculative and are required to be liquidated first.
Can your calculator calculate post-judgment statutory interest?
I have an entirely separate calculator for Florida post-judgment interest that handles all of the complications involved.