Cortisol/DHEA Ratio Calculator

The Cortisol/DHEA Ratio Calculator calculates your cortisol-to-DHEA ratio from test results and suggests reference ranges for interpretation.

Cortisol/DHEA Ratio Calculator Explained

Cortisol is a glucocorticoid hormone that supports metabolism and the stress response. DHEA, often measured as DHEA-S (dehydroepiandrosterone sulfate), is an adrenal androgen precursor. The cortisol/DHEA ratio compares catabolic activity (cortisol) to anabolic support (DHEA or DHEA-S). Researchers and coaches use it as a proxy for stress load and recovery status.

The ratio is not a diagnosis. It summarizes two lab values into a single index of balance. Higher ratios may reflect acute strain or chronic stress. Lower ratios may reflect resilient recovery or, in some contexts, underproduction of cortisol. Always interpret your ratio with your clinician, using the same sample type, time of day, and consistent assay methods.

Cortisol/DHEA Ratio Formulas & Derivations

The ratio can be computed with mass units (for example, µg/dL) or molar units (nmol/L). Use the same basis for both hormones. If your lab reports different units, convert one value first. The calculator supports both mass-based and molar-based ratios.

• Mass ratio (same units): Ratio = Cortisol / DHEA (or DHEA-S).
• Molar ratio: Convert both to nmol/L, then Ratio = Cortisol_nmol/L / DHEA_nmol/L or DHEA‑S_nmol/L.
• Common conversion factors: Cortisol 1 µg/dL = 27.59 nmol/L; DHEA 1 µg/dL = 34.67 nmol/L; DHEA‑S 1 µg/dL = 27.14 nmol/L.
• Log ratio (optional for trend analysis): log10 Ratio = log10(Cortisol) − log10(DHEA or DHEA‑S).
• Normalized ratio (optional): Z‑score each hormone to lab reference, then difference Z_cortisol − Z_{DHEA or DHEA‑S}.

Mass ratios are easy when both analytes are reported in the same units. Molar ratios allow better comparison across methods. The log and normalized forms help stabilize variability across assays and sessions, especially when tracking training cycles and intensity changes.

How the Cortisol/DHEA Ratio Method Works

Your adrenal glands produce cortisol in a diurnal pattern, peaking in the early morning. DHEA-S changes more slowly and declines with age. The ratio captures the balance at a specific time under defined conditions. To make meaningful comparisons, match the sample type, collection time, posture, and pre-test activity.

• Choose the analyte: pair cortisol with DHEA or with DHEA-S, based on what your lab reports.
• Use the same sample matrix for both values when possible (serum with serum, saliva with saliva).
• Collect at the same clock time for repeated tests due to circadian rhythms.
• Convert units so both values share the same basis (mass or molar) before dividing.
• Compute the ratio and compare it with your prior results and the lab’s reference ranges.
• Assess trends week to week rather than single points, especially around changes in training intensity.

Because context drives interpretation, record sleep quality, illness, caloric intake, and recent workouts. A rising ratio after harder sessions can be expected. A persistently high or very low ratio merits professional review, especially if symptoms are present.

Inputs, Assumptions & Parameters

The calculator converts your lab numbers into a single ratio. It requires consistent units, the analyte you used for the denominator, and optional context for better tracking. Enter precise values and note collection details for reliable comparisons.

• Cortisol value and units (for example, µg/dL, nmol/L, or ng/mL for saliva).
• DHEA or DHEA-S value and units.
• Sample type: serum, plasma, saliva, or urine (24-hour or spot).
• Collection time and posture (morning upright, midnight, or other).
• Age and sex (affect DHEA-S reference ranges).
• Medications and supplements (for example, glucocorticoids, oral contraceptives, DHEA).

Different labs use different reference ranges and assays. Saliva and serum values are not interchangeable. If your inputs mix sample types or times, the resulting ratio will be difficult to compare. The calculator assumes steady-state conditions and that both values come from comparable sampling contexts.

Using the Cortisol/DHEA Ratio Calculator: A Walkthrough

Here’s a concise overview before we dive into the key points:

1. Choose whether your denominator is DHEA or DHEA-S based on your report.
2. Enter the cortisol value and select its units.
3. Enter the DHEA or DHEA-S value and select its units.
4. Select sample type and collection time to annotate your result.
5. Optionally toggle “molar ratio” to convert both values to nmol/L.
6. Click Calculate to see the ratio and a brief interpretation note.

These points provide quick orientation—use them alongside the full explanations in this page.

Case Studies

A 35-year-old endurance athlete tests fasting at 8 a.m. after a heavy training week. Serum cortisol is 19 µg/dL; DHEA-S is 140 µg/dL. Using a mass ratio: 19/140 = 0.136. Using molar conversion, cortisol is 19 × 27.59 = 524 nmol/L; DHEA-S is 140 × 27.14 = 3,800 nmol/L; molar ratio = 0.138. The ratio rose from his baseline of 0.09 during a recovery week. What this means: Training intensity likely pushed stress load up; monitor recovery and retest after deload.

A 52-year-old office worker measures late-night saliva during a period of poor sleep. Salivary cortisol is 7 nmol/L and salivary DHEA is 0.6 nmol/L. Molar ratio = 7/0.6 = 11.7. A week later, with improved sleep hygiene, the same test is 3 nmol/L cortisol and 0.7 nmol/L DHEA; ratio = 4.3. What this means: Sleep disruption inflated the ratio; improving sleep reduced the imbalance.

Assumptions, Caveats & Edge Cases

The ratio is a summary metric, not a diagnosis. It assumes synchronized sampling, stable assay performance, and no acute confounders. Outlier values often reflect timing, medication, or illness rather than adrenal status alone.

• Glucocorticoid therapy, inhaled steroids, or topical steroids can elevate measured cortisol.
• Oral contraceptives and some chronic illnesses can lower DHEA-S.
• Acute illness, sleep loss, and caloric deficit can transiently raise cortisol.
• Age lowers DHEA-S; compare against age- and sex-specific ranges.
• Sample mismatch (serum vs saliva) will distort comparisons across tests.

If you see extreme ratios or a sustained shift with symptoms, share results with a clinician. They may repeat testing, change the sample time, or use mass spectrometry to verify immunoassay results.

Units & Conversions

Units matter because cortisol, DHEA, and DHEA-S are reported in different systems. The ratio only makes sense when both hormones share the same unit basis. If you mix units, convert first or use the molar option for consistency.

Multiply by the factor shown to convert to nmol/L. For example, 12 µg/dL cortisol is 12 × 27.59 = 331 nmol/L. If your lab reports in µg/dL for one analyte and nmol/L for the other, convert one so both match before computing the ratio.

Troubleshooting

If your ratio seems implausible, it usually reflects a unit mismatch or a sample-type mismatch. Check whether DHEA vs DHEA-S was entered correctly, and confirm the collection time. Recalculate using the molar option to standardize across units.

• Verify both values come from the same day and similar conditions.
• Confirm units, especially ng/mL versus µg/dL for saliva versus serum.
• Look for medications or supplements that affect either hormone.

When in doubt, repeat testing under stable conditions. Use the same lab and method to minimize assay variability, then compare trends rather than single snapshots.

FAQ about Cortisol/DHEA Ratio Calculator

Should I use DHEA or DHEA-S in the ratio?

Use the hormone your lab measured. Most serum reports provide DHEA-S because it is more stable and easier to measure reliably.

What time of day is best for testing?

Morning fasting samples are standard for serum cortisol. If testing saliva, use the lab’s diurnal protocol and match the time across repeat tests.

Can I compare saliva results with serum results?

No. The absolute values differ by matrix and method. Track saliva with saliva and serum with serum for meaningful comparisons.

What does a higher ratio mean for training?

It often reflects higher stress load or inadequate recovery. Watch trends across weeks and adjust training intensity and sleep before drawing conclusions.

Glossary for Cortisol/DHEA Ratio

Cortisol

A glucocorticoid hormone made by the adrenal cortex that supports energy metabolism and the stress response with a daily rhythm.

DHEA

Dehydroepiandrosterone, an adrenal androgen precursor that can be measured in serum or saliva; more variable than DHEA-S.

DHEA-S

Dehydroepiandrosterone sulfate, the sulfated, more stable form of DHEA, commonly measured in serum with age-dependent ranges.

Molar concentration

Amount of substance per volume, usually expressed as nmol/L. It accounts for molecular weight when comparing analytes.

Diurnal rhythm

The daily pattern of hormone secretion. Cortisol is highest in the morning and lowest at night under typical sleep schedules.

Immunoassay

A laboratory method that uses antibodies to measure hormones. It can be affected by cross-reactivity and matrix effects.

LC-MS/MS

Liquid chromatography–tandem mass spectrometry, a highly specific analytical method often used to confirm hormone results.

Catabolic vs anabolic

Catabolic processes break down tissues and release energy; anabolic processes build or repair tissues. The ratio reflects this balance.

Disclaimer: This tool is for educational estimates. Consider professional advice for decisions.

References

Here’s a concise overview before we dive into the key points:

• MedlinePlus: Cortisol test overview and clinical uses
• MedlinePlus: DHEA-S (dehydroepiandrosterone sulfate) test
• Endocrine Society guideline: Diagnosis of Cushing’s Syndrome
• University of Iowa Pathology Handbook: Dehydroepiandrosterone Sulfate (DHEA-S)
• Kirschbaum & Hellhammer: Salivary cortisol in psychobiological research
• University of Iowa Pathology Handbook: Cortisol, Serum

These points provide quick orientation—use them alongside the full explanations in this page.