X Fip Expected Fip Calculator
Our baseball calculator computes fip expected fip instantly. Get accurate stats with historical comparisons and benchmarks.
Formula
xFIP = ((13 * Expected HR) + (3 * (BB + HBP)) - (2 * K)) / IP + FIP Constant
Where Expected HR = Fly Balls * League HR/FB Rate, BB = Walks, HBP = Hit by Pitch, K = Strikeouts, IP = Innings Pitched, and FIP Constant is approximately 3.10 (calibrated so league FIP = league ERA).
Worked Examples
Example 1: Ace Pitcher Season Analysis
Problem: A starting pitcher has 200 IP, 220 K, 45 BB, 3 HBP, 180 fly balls, 18 HR allowed. League HR/FB is 10.5%. Calculate FIP and xFIP.
Solution: FIP = ((13*18) + (3*(45+3)) - (2*220)) / 200 + 3.10\nFIP = (234 + 144 - 440) / 200 + 3.10 = -62/200 + 3.10 = -0.31 + 3.10 = 2.79\nExpected HR = 180 * 0.105 = 18.9\nxFIP = ((13*18.9) + (3*48) - (2*220)) / 200 + 3.10\nxFIP = (245.7 + 144 - 440) / 200 + 3.10 = -50.3/200 + 3.10 = 2.85
Result: FIP: 2.79 | xFIP: 2.85 | Actual HR/FB: 10.0% | Expected HR: 18.9
Example 2: Unlucky Pitcher with High HR/FB
Problem: A pitcher has 150 IP, 130 K, 55 BB, 6 HBP, 160 fly balls, 28 HR allowed. League HR/FB is 10.5%. Is the HR rate sustainable?
Solution: HR/FB rate = 28/160 = 17.5% (well above league average 10.5%)\nFIP = ((13*28) + (3*(55+6)) - (2*130)) / 150 + 3.10\nFIP = (364 + 183 - 260) / 150 + 3.10 = 287/150 + 3.10 = 5.01\nExpected HR = 160 * 0.105 = 16.8\nxFIP = ((13*16.8) + (3*61) - (2*130)) / 150 + 3.10\nxFIP = (218.4 + 183 - 260) / 150 + 3.10 = 141.4/150 + 3.10 = 4.04
Result: FIP: 5.01 | xFIP: 4.04 | HR/FB 17.5% likely to regress toward 10.5%
Frequently Asked Questions
What is xFIP and how does it differ from FIP?
xFIP stands for Expected Fielding Independent Pitching and is a refinement of the FIP (Fielding Independent Pitching) statistic. While FIP uses a pitcher's actual home runs allowed, xFIP replaces the actual home run total with an expected number based on the league-average home run per fly ball rate. This adjustment is made because research has shown that pitchers have limited control over the percentage of their fly balls that become home runs. A pitcher who allows a high HR/FB rate in one season is likely experiencing bad luck and will regress toward the league average. xFIP therefore provides a more stable and predictive measure of pitcher performance than standard FIP.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.
How do I interpret the result?
Results are displayed with a label and unit to help you understand the output. Many calculators include a short explanation or classification below the result (for example, a BMI category or risk level). Refer to the worked examples section on this page for real-world context.
What formula does X Fip Expected Fip Calculator use?
The formula used is described in the Formula section on this page. It is based on widely accepted standards in the relevant field. If you need a specific reference or citation, the References section provides links to authoritative sources.
Does X Fip Expected Fip Calculator work offline?
Once the page is loaded, the calculation logic runs entirely in your browser. If you have already opened the page, most calculators will continue to work even if your internet connection is lost, since no server requests are needed for computation.
How accurate are the results from X Fip Expected Fip Calculator?
All calculations use established mathematical formulas and are performed with high-precision arithmetic. Results are accurate to the precision shown. For critical decisions in finance, medicine, or engineering, always verify results with a qualified professional.