Carboplatin Calculator - Calvert AUC Dose

A carboplatin calculator is a clinical decision support tool that estimates a single-cycle carboplatin chemotherapy dose in milligrams using the Calvert formula and a chosen target AUC. It combines a kidney function estimate from the patient's age, sex, weight, and serum creatinine with the target drug exposure so prescribers and pharmacists can plan an infusion before a chemotherapy session.

• • Oncology planning: Oncologists, pharmacists, and infusion nurses preparing a single-cycle carboplatin order for ovarian, lung, or other solid tumor regimens.
• • Renal-dose adjustment: Clinicians adjusting carboplatin for patients with reduced kidney function or a rising serum creatinine between cycles.
• • Pharmacy verification: Pharmacists double-checking a prescriber's written dose against the Calvert formula and the patient's most recent labs.
• • Patient education: Patients and caregivers learning why kidney function directly changes a chemotherapy dose between cycles.

The Calvert formula was published in 1989 and remains the most widely used pharmacokinetic model for carboplatin dosing. It targets a fixed area under the free-platinum concentration-time curve (AUC) rather than a flat mg per m² dose, which makes the same drug exposure achievable across patients with very different kidney functions.

Inside this carboplatin calculator, the kidney function estimate comes from the Cockcroft-Gault creatinine clearance equation, which most clinical teams substitute for the measured GFR (typically 51Cr-EDTA) that the original Calvert validation actually used. The +25 term in the formula is the empirical y-intercept of the relationship between carboplatin clearance and measured GFR in the original study, and it represents non-renal carboplatin clearance through biliary, fecal, and slow tissue-release routes.

The result is reported as a single-cycle total dose in milligrams. Always have the treating oncologist confirm the target AUC and the dose before the infusion is prepared.

Because the carboplatin dose depends so heavily on kidney function, the GFR Calculator is a useful first stop when a patient has unstable renal labs or you want to compare estimates.

The calculator performs two clinical calculations in sequence. First it estimates the patient's creatinine clearance with Cockcroft-Gault, then it converts that clearance into a single-cycle carboplatin dose with the Calvert formula.

• Target AUC: The drug exposure goal in mg·min/mL, chosen by the prescriber based on the regimen (typically 4-6).
• CrCl: Creatinine clearance in mL/min from the Cockcroft-Gault equation: ((140 - age) × weight in kg) / (72 × serum creatinine in mg/dL), with a further 0.85 factor applied for female patients.
• +25: Empirical constant for non-renal carboplatin clearance (biliary, fecal, and slow tissue release) derived as the y-intercept of the original Calvert regression between measured GFR and carboplatin clearance.

According to Calvert et al. (Journal of Clinical Oncology, 1989), the carboplatin total dose in milligrams equals the target AUC multiplied by the sum of the glomerular filtration rate and 25. The original derivation used measured GFR, but most clinical teams substitute Cockcroft-Gault creatinine clearance because it is available from routine labs.

If you need a separate Cockcroft-Gault estimate, this site's GFR calculator works on the same inputs and reports creatinine clearance in mL/min. For dose per square meter, the BSA calculator provides a quick body surface area to compare against older mg/m² regimens.

According to Calvert et al., J Clin Oncol 1989, carboplatin total dose in milligrams equals the target AUC multiplied by the sum of the glomerular filtration rate and 25.

According to Cockcroft & Gault, Nephron 1976, creatinine clearance in mL/min can be estimated as ((140 minus age in years) times weight in kg) divided by (72 times serum creatinine in mg/dL), with a further 0.85 factor applied for female patients.

If you still need to compare older mg/m² regimens, the BSA Calculator gives the body surface area that pairs with the Calvert AUC dose on the same patient.

Four ideas come up every time the Calvert formula is used in practice. They explain why this carboplatin calculator behaves the way it does.

These four concepts travel together in oncology practice. Once you understand the relationship between the AUC goal and the kidney function estimate, the dose automatically reflects the patient's current renal status.

When a sudden jump in serum creatinine makes the CrCl estimate look implausible, the BUN/Creatinine Ratio Calculator helps you place that change in a broader renal-function picture before the next cycle.

Run the calculator just before a cycle is prepared so the inputs match the patient's most recent labs.

1. 1 Enter sex, age, and weight: Choose biological sex, current age in years, and the patient's most recent body weight in kilograms. These feed the Cockcroft-Gault clearance estimate.
2. 2 Add the latest serum creatinine: Type the serum creatinine from the most recent lab draw in mg/dL. Values below 0.4 mg/dL are automatically clamped to 0.4 to avoid inflated clearances.
3. 3 Choose the target AUC: Pick the target AUC prescribed by the oncologist. Common options are 4 for combination regimens, 5 for standard monotherapy, and 6-7 for high-dose protocols.
4. 4 Read the estimated GFR and dose: The result panel shows the Cockcroft-Gault creatinine clearance and the single-cycle carboplatin dose in milligrams rounded to a whole number.
5. 5 Confirm with the prescriber: Have the treating oncologist or pharmacist confirm the target AUC and the final milligram dose before the infusion is mixed and administered.

A 60-year-old woman, 70 kg, with a serum creatinine of 1.0 mg/dL and a target AUC of 5 produces an estimated GFR around 66 mL/min and a single-cycle carboplatin dose of about 455 mg. Always cross-check this against the prescriber's order and the patient's most recent renal function trend before preparation.

The tool turns two familiar equations into a fast, transparent estimate that fits a normal pre-cycle workflow.

• • Calvert formula ready to use: A complete Calvert implementation in a single page so the prescriber or pharmacist does not have to derive the dose by hand.
• • Cockcroft-Gault built in: The same kidney function estimate that clinical teams substitute for the measured GFR in the original Calvert formula is applied automatically from age, sex, weight, and serum creatinine.
• • Target AUC choices: Presets for AUC 4, 5, 6, and 7 cover most common carboplatin monotherapy and combination regimens in current oncology practice.
• • Renal-dose safety: Serum creatinine is clamped at 0.4 mg/dL and the resulting CrCl is capped at 125 mL/min, a common safety convention in adult carboplatin protocols to avoid inflated doses in patients with very low serum creatinine or low muscle mass.
• • Per-cycle transparency: The single-cycle milligram result is shown next to the GFR estimate so the dose is easy to explain to patients and other clinicians.
• • Useful for pharmacy verification: Pharmacists can re-run the calculation quickly when checking a written order against the latest labs.

These benefits match the way oncology teams already document carboplatin dosing. For a fuller picture of kidney function, pair this calculator with the BUN/Creatinine ratio calculator and the GFR calculator. When a regimen is still written in mg per m², the BSA calculator gives the surface area needed for that conversion.

After the dose is calculated, the ANC Calculator is the natural follow-up for tracking the absolute neutrophil count between cycles so the next carboplatin order is informed by recent bone marrow recovery.

Several patient-specific factors change the carboplatin dose the calculator returns. Most of them flow through the kidney function estimate.

• • Creatinine clearance is an estimate of GFR. It is not a substitute for a measured GFR in patients with very abnormal muscle mass, amputations, or rapidly changing kidney function.
• • The carboplatin calculator returns a single-cycle dose. It does not account for the number of cycles, supportive medications, or combination chemotherapy partners that the prescriber chooses.
• • Real-world dosing also depends on local protocols, prior toxicity, performance status, and lab trends. According to Cancer Research UK, carboplatin dosing is usually calculated using the Calvert formula so the same target drug exposure is delivered regardless of the patient's kidney function.

According to Cancer Research UK, carboplatin dosing is usually calculated using the Calvert formula so the same target drug exposure is delivered regardless of the patient's kidney function.

If proteinuria or microalbuminuria is part of the patient's history, the ACR Calculator rounds out the renal picture used to set the next carboplatin target AUC.