Steroid Conversion Calculator: Corticosteroid Equivalent Doses

Use the Steroid Conversion Calculator: Corticosteroid Equivalent Doses

How to Use Steroid Conversion Calculator: Corticosteroid Equivalent Doses

1. Step 1: Choose a source corticosteroid

   Select the steroid you are converting from (e.g., prednisone, dexamethasone, methylprednisolone, or hydrocortisone). The equivalence factor is shown next to each option.

2. Step 2: Enter the daily dose in mg

   Type the current daily dose in milligrams. Use the quick‑select preset buttons for common doses, or type any value including decimals.

3. Step 3: Set rounding to match tablet strengths

   Pick a rounding increment (0.5, 1, 2.5, or 5 mg) that matches available tablet strengths, or leave it at no rounding for exact values.

4. Step 4: Select a target steroid (optional)

   Choose a specific target steroid to highlight, or leave “Show all” to see conversions across all 9 corticosteroids. Use the Swap button to reverse the conversion direction.

5. Step 5: Review your steroid conversion results

   Press Calculate to see the prednisone‑equivalent dose, intensity classification, and equivalent doses for all steroids. Switch to the Equivalence Chart tab for a quick reference table.

Key Features

• Instant steroid conversion across 9 corticosteroids
• Visual equivalence chart with dose comparison table
• Tablet-friendly dose rounding (0.5, 1, 2.5, 5 mg increments)
• Prednisone-equivalent dose intensity classification
• Common tablet strengths for practical prescribing

Understanding Your Steroid Conversion Results

How the Conversion Formula Works

We convert every input into a common yardstick: prednisone‑equivalent (PEQ) mg/day. If a steroid requires X mg to equal 5 mg prednisone (its equivalence factor), then PEQ = SourceDose × (5 ÷ X). To get a target dose, invert the step: Target mg = PEQ × (X ÷ 5). We display both the unrounded result and, if you choose a rounding option, a tablet‑friendly number.

Dose Intensity Classification

The prednisone‑equivalent bands provide a quick feel for corticosteroid dose intensity. As a general guideline for adults: low ≤7.5 mg/day, moderate 7.5–30 mg/day, high 30–100 mg/day, and very high >100 mg/day. Use these as orientation only—the right dose depends on indication, duration, and patient‑specific risk.

Quick Reference Equivalences

Key corticosteroid equivalences (systemic oral): hydrocortisone 20 mg ≈ cortisone acetate 25 mg ≈ prednisone 5 mg ≈ prednisolone 5 mg ≈ methylprednisolone 4 mg ≈ triamcinolone 4 mg ≈ dexamethasone 0.75 mg ≈ betamethasone 0.6 mg ≈ deflazacort 6 mg. Use the Equivalence Chart tab in the calculator above for a complete table with relative potencies and mineralocorticoid activity.

Assumptions & Limitations

Steroid conversions are approximations for systemic oral corticosteroids. Potency equivalence does not ensure identical mineralocorticoid effects, kinetics, or side‑effect profiles. Inhaled, topical, intra‑articular, and some parenteral products follow different rules. Always verify against local guidance and clinical context.

This tool is educational and not a prescribing system. Do not start, stop, or change medicines based on this page without a licensed clinician.

Complete Guide: Steroid Conversion Calculator: Corticosteroid Equivalent Doses

Free steroid conversion calculator with equivalence chart. Convert prednisone, dexamethasone, methylprednisolone, and hydrocortisone equivalent doses.

This guide explains how corticosteroid dose equivalence works, walks through common steroid conversion pairs like dexamethasone to prednisone and methylprednisolone to prednisone, and covers when rounding is reasonable. It is for education only and does not replace clinical judgment or local protocols.

What is a steroid conversion calculator?

A steroid conversion calculator helps you translate a dose of one systemic corticosteroid (for example, prednisone) into the equivalent anti‑inflammatory dose of another steroid (for example, dexamethasone). Clinicians often need this when changing drug availability, matching a formulary, or converting a patient's regimen to a different molecule for specific side‑effect profiles. The underlying idea is potency: how much of drug A produces the same glucocorticoid effect as a reference dose of prednisone.

Our steroid conversion calculator uses widely taught equivalence factors (e.g., hydrocortisone 20 mg ≈ prednisone 5 mg ≈ methylprednisolone 4 mg ≈ dexamethasone 0.75 mg). You enter a daily dose and source steroid, optionally pick a rounding preference, and it returns a prednisone‑equivalent (mg/day) plus conversions across all other common corticosteroids.

Quick start: using the tool

Start by choosing the source steroid, type the daily dose in milligrams, and select a rounding option that fits available tablet strengths. Tap Calculate to see your prednisone‑equivalent and a grid of equivalent doses for the other corticosteroids. You can highlight a single target steroid to focus on a likely substitute, and use the Swap button to quickly reverse the conversion direction.

For pediatric or weight‑based scenarios, consider pairing this with our pediatric dose calculator and our mg/mL dose calculator if you are working with liquid formulations. If you are converting other drug classes, see the opioid conversion calculator or our general dosage calculator.

Steroid equivalence chart and factors

The steroid conversion chart lines up drugs by the dose that matches the anti‑inflammatory effect of a reference dose (commonly prednisone 5 mg). A simplified systemic oral steroid equivalence set looks like this (≈ indicates approximate equivalence):

These corticosteroid equivalence values come from decades of clinical use and pharmacology texts. They are not exact for every indication, route, or patient. Mineralocorticoid activity differs (for example, hydrocortisone has more salt‑retaining effects than dexamethasone), and clinical goals vary across rheumatologic, pulmonary, and neurologic diseases. Use the steroid conversion chart as a starting point, not an automated order.

Dexamethasone to prednisone conversion

Dexamethasone is approximately 6.67 times more potent than prednisone for anti‑inflammatory effects. The conversion factor is: dexamethasone 0.75 mg ≈ prednisone 5 mg. To convert dexamethasone to prednisone, multiply the dexamethasone dose by 6.67 (or more precisely, by 5 ÷ 0.75).

Common dexamethasone to prednisone conversion examples: dexamethasone 2 mg ≈ prednisone 13.3 mg, dexamethasone 4 mg ≈ prednisone 26.7 mg (often rounded to 25 mg), dexamethasone 6 mg ≈ prednisone 40 mg, and dexamethasone 12 mg ≈ prednisone 80 mg. In the reverse direction (prednisone to dexamethasone), divide the prednisone dose by 6.67. Note that dexamethasone has negligible mineralocorticoid activity, so switching from hydrocortisone or prednisone to dexamethasone may reduce sodium retention and edema. Decadron is a common brand name for dexamethasone. For a dedicated tool focused on this specific pair, try our dexamethasone to prednisone conversion calculator.

Methylprednisolone (Solu‑Medrol) to prednisone conversion

Methylprednisolone is 1.25 times more potent than prednisone: methylprednisolone 4 mg ≈ prednisone 5 mg. To convert methylprednisolone to prednisone, multiply by 1.25. Solu‑Medrol (methylprednisolone sodium succinate) is the IV formulation commonly used in hospital settings.

Typical conversion examples: methylprednisolone 4 mg ≈ prednisone 5 mg, methylprednisolone 16 mg ≈ prednisone 20 mg, Solu‑Medrol 40 mg ≈ prednisone 50 mg, Solu‑Medrol 125 mg ≈ prednisone 156 mg (rounded to 155 or 160 mg). When converting from IV methylprednisolone (Solu‑Medrol) to oral prednisone, the 1.25x factor is a useful starting point, though IV bioavailability is 100% versus ~70–80% for oral prednisone. Always verify with your pharmacist for high‑dose or pulse‑therapy conversions. Medrol (oral methylprednisolone) dose packs typically use 4 mg tablets in a tapering schedule.

Hydrocortisone to prednisone conversion

Hydrocortisone 20 mg ≈ prednisone 5 mg, making prednisone 4 times more potent. To convert hydrocortisone to prednisone, divide the hydrocortisone dose by 4. Common examples: hydrocortisone 50 mg ≈ prednisone 12.5 mg, hydrocortisone 100 mg ≈ prednisone 25 mg, hydrocortisone 200 mg ≈ prednisone 50 mg. For the reverse direction, multiply the prednisone dose by 4 to get hydrocortisone equivalent.

Hydrocortisone has significant mineralocorticoid activity (salt and water retention), unlike dexamethasone. Physiologic replacement for adrenal insufficiency is typically 15–25 mg hydrocortisone per day (equivalent to ≈3.75–6.25 mg prednisone), usually split into two or three doses. When converting from stress‑dose hydrocortisone (e.g., 50 mg every 8 hours) to an oral prednisone taper, the transition timing and mineralocorticoid coverage must be considered.

Prednisone‑equivalent: the common language

Steroid conversions are easier when you translate everything into a single yardstick: prednisone‑equivalent (PEQ) mg/day. Our calculator does this in two steps. First, it computes PEQ from your source: PEQ = SourceDose × (5 ÷ mg‑for‑pred‑5). Second, it calculates the target dose: Target mg = PEQ × (mg‑for‑pred‑5 ÷ 5). The result is also shown unrounded and, if you pick a rounding option, rounded to tablet‑friendly numbers.

As a rough orientation for adults, PEQ ≤7.5 mg/day is often described as low dose, 7.5–30 mg/day moderate, 30–100 mg/day high, and >100 mg/day very high. These are descriptive bands rather than rules. Context matters: short bursts, chronic maintenance, and disease activity all influence risk and benefit.

Rounding, tablets, and practicality

Real‑world prescribing depends on what tablet strengths are on the shelf. We include rounding options (0.5 mg, 1 mg, 2.5 mg, 5 mg) to help you quickly match a practical dose. For dexamethasone, 0.5 mg increments are common; for prednisone, 1 mg or 2.5 mg steps are typical in many formularies. When the exact number is not available, clinicians may round toward a safer side depending on indication and duration.

If you need weight‑based calculations first, try our dosage calculator and for chemotherapy or other mg/m² workflows, the BSA calculator can be helpful in upstream planning.

Mineralocorticoid effects matter

Not all corticosteroids share the same mineralocorticoid (salt‑retaining) activity. Hydrocortisone and cortisone acetate have high mineralocorticoid effect compared with dexamethasone and betamethasone, which are almost purely glucocorticoid. That is why dose‑for‑ dose swaps can change edema, blood pressure, or potassium effects even when the anti‑inflammatory potency is matched. Keep this in mind for heart failure, cirrhosis, and other sodium‑sensitive conditions.

Route and formulation differences

The equivalence factors here are for systemic oral use. Parenteral formulations may have different bioavailability or clinical considerations. Inhaled, topical, and intra‑articular steroids follow completely different potency and exposure rules and should not be converted using systemic tables. When switching between immediate‑release and modified‑release or enteric‑coated products, consider absorption timing and local guidance.

If dose timing or biologic half‑life affects your plan (for example, once‑daily versus divided dosing), you can review general kinetics with the drug half‑life calculator and adjust schedules accordingly.

When to use (and when not to)

Use steroid conversions when drug supply dictates a different molecule, when aligning with a protocol that specifies a particular steroid, or when harmonizing complex regimens across care settings. Avoid mechanical conversions for diseases that have protocol‑specific guidance (e.g., certain oncology or transplant pathways) without verifying the recommended agent and schedule.

For children and older adults, dosing windows tend to be narrower, and adverse effects can emerge earlier. Consider the pediatric dose calculator and the geriatric dose calculator to check reasonable ranges before thinking about conversions.

About tapering and conversions

Tapering aims to reduce cumulative exposure and allow hypothalamic‑pituitary‑adrenal (HPA) axis recovery. Steroid conversions can help you pick an equipotent starting point before tapering, but the taper schedule is not dictated by equivalence alone. Duration of prior therapy, cumulative dose, comorbidities, and relapse risk all matter. Many clinicians taper faster at higher doses and slower once around physiologic replacement (≈5 mg prednisone/day equivalent), but plans vary widely.

Because practice varies, always follow a protocol endorsed by your team or institution. If you are designing patient‑friendly handouts, ensure language is clear and emphasizes warning symptoms of adrenal suppression and disease flare.

Safety notes, limits, and sources

This tool is informational and does not provide medical advice. Do not use it to start, stop, or change medicines without a licensed clinician. The equivalence factors above are widely used approximations; they vary by source, population, and indication. When in doubt, consult your local formulary, a pharmacist, or an institutional guideline.

Useful overviews include the NCBI Bookshelf chapter on glucocorticoid therapy and tapering and reviews of corticosteroid adverse effects. See: NCBI Bookshelf entries such as "Glucocorticoid Therapy and Cushing's Syndrome" and "Adrenal Suppression". For disease‑specific targets, consult specialty society guidelines (e.g., rheumatology, pulmonology).

Steroid conversions are a helpful bridge between theory and practice. Used thoughtfully—with attention to indication, formulation, and patient‑specific risks—they can simplify transitions while keeping potency consistent. Whether you need to convert dexamethasone to prednisone, switch from Solu‑Medrol to oral methylprednisolone, or calculate hydrocortisone equivalents, the key is combining the numbers with clinical judgment and, when possible, a second check from a pharmacist or protocol.

Frequently Asked Questions