LH/FSH Ratio Tool – Free Online LH to FSH Ratio Calculator

Luteinizing hormone (LH) and follicle-stimulating hormone (FSH) are pituitary hormones that regulate reproductive function. According to Wikipedia’s LH article and the FSH article, they work together to support ovarian follicle development, ovulation, menstrual cycle regulation and hormonal signalling.

In some clinical discussions—especially related to menstrual irregularities—the LH/FSH ratio is reviewed to identify certain hormonal patterns. While the ratio alone cannot diagnose any condition, it may show whether LH appears proportionally higher or lower than FSH in a given lab report. The LH/FSH Ratio Tool explains this pattern in educational terms only.

The tool allows you to enter your LH and FSH values exactly as printed on your laboratory report. After clicking “Calculate Ratio”, the script:

• Confirms that both values are valid numbers.
• Computes the LH-to-FSH ratio automatically.
• Displays a clear, concise summary of the calculated ratio.
• Provides an educational explanation of what a higher or lower ratio may generally indicate—without diagnosing any condition.

The calculator does not determine whether your result is “normal” or “abnormal” on its own because reference intervals vary by age, menstrual cycle phase, and laboratory methods. Instead, it offers context designed to help you discuss the numbers confidently with your healthcare provider.

The LH/FSH ratio is sometimes reviewed in reproductive medicine to identify general hormonal patterns:

• Higher LH relative to FSH – may be discussed in cases of hormonal imbalance, ovarian cycle irregularities or endocrine signalling shifts.
• Lower LH relative to FSH – may appear in situations involving pituitary or ovarian signalling differences.
• Similar LH and FSH levels – often seen in many normal phases of the menstrual cycle.

These patterns are not diagnostic. The LH/FSH Ratio Tool highlights them for educational purposes so you can better understand medical discussions, textbooks or lab reports that reference the ratio.

For additional hormonal context, many users also explore the Hormones Analyzer or the DHEA-S Analyzer to understand broader endocrine patterns.

Here is the simple process for using the tool:

• Open your LH and FSH lab results.
• Enter each value into the calculator fields exactly as printed.
• Click the “Calculate Ratio” button.
• Review the generated ratio and the accompanying educational notes.

You can enter older results or compare multiple reports to observe how hormone levels and ratios change during different menstrual phases or over long-term follow-up. The tool is purely educational and not intended for clinical decision-making.

Users who monitor reproductive hormone trends often also check their Cortisol Analyzer or Thyroid Analyzer for additional endocrine insights.

Several calculators on labscan.cloud naturally complement the LH/FSH Ratio Tool:

• Hormones Analyzer – provides educational insights into multiple hormone markers at once.
• DHEA-S Analyzer – explains levels of a key adrenal hormone often reviewed alongside LH and FSH.
• Hemoglobin Tool – may be considered when reviewing fatigue and energy concerns that overlap with reproductive patterns.

These tools share the same philosophy: clear explanations, no diagnoses, and strong encouragement to discuss all results with qualified healthcare professionals.

Does a high LH/FSH ratio mean I have a specific medical condition?
No. While the ratio may be referenced in certain clinical discussions, it cannot diagnose anything on its own. Proper evaluation requires symptoms, exam findings and a full hormonal work-up.

Can the ratio help predict ovulation?
Not directly. Ovulation prediction typically relies on LH surges, ultrasound, and cycle tracking—not the LH/FSH ratio alone.

Does the tool account for menstrual cycle phase?
No. LH and FSH levels can vary widely throughout the cycle. The tool simply calculates the ratio mathematically and provides educational notes.

Can men use the LH/FSH Ratio Tool?
Yes. Men also have LH and FSH, and the ratio may be reviewed in discussions related to fertility or endocrine evaluation. Interpretation still requires professional oversight.

By exploring the LH/FSH Ratio Tool together with other calculators on labscan.cloud, you can gain a clearer understanding of hormonal relationships—while keeping all diagnostic and treatment decisions with your healthcare professionals.