Carboplatin Dose Calculator
Calculate carboplatin dose using the Calvert formula based on Cockcroft-Gault GFR. Enter age, sex, weight, serum creatinine, and target AUC for accurate chemotherapy dosing with breakdowns and charts.
About This Calculator
The Carboplatin Dose Calculator helps oncology healthcare professionals and patients estimate the appropriate carboplatin dose using the validated Calvert formula. Carboplatin is a platinum-based chemotherapy drug used to treat lung, ovarian, brain, and other cancers. Since approximately 70% of carboplatin is excreted unchanged in urine within 24 hours, accurate dosing depends critically on kidney function assessment.
The calculator works in two steps: first, it estimates glomerular filtration rate (GFR) using the Cockcroft-Gault equation (Men: GFR = ((140 - age) × weight) / (72 × serum creatinine); Women: GFR × 0.85). Then it applies the Calvert formula: Carboplatin Dose (mg) = Target AUC × (GFR + 25). The maximum recommended dose is capped at AUC × 150 based on GFR capped at 125 mL/min. For obese patients (BMI ≥ 25 kg/m²) or those with low creatinine levels, clinical adjustments may be necessary.
Regional Notes
United States: The NCCN (National Comprehensive Cancer Network) recommends using the Calvert formula with Cockcroft-Gault GFR estimation. Serum creatinine is measured in mg/dL; weight in kg. For AUC > 6, measured creatinine clearance is preferred over estimated GFR.
United Kingdom: NICE guidelines endorse the Calvert formula for carboplatin dosing. UK practice uses the same Cockcroft-Gault equation but may also incorporate EDTA-measured GFR for precision dosing, especially in clinical trials and for AUC > 6 regimens.
India: Carboplatin dosing follows the same Calvert formula internationally. Indian oncologists often use a minimum serum creatinine of 0.7 mg/dL to avoid GFR overestimation in patients with low muscle mass. Weight-based dosing adjustments are common for the Indian population where average body weight may differ from Western norms.
Always consult with an oncologist or clinical pharmacist before administering chemotherapy. This calculator is for educational and reference purposes only.
Frequently Asked Questions
How is carboplatin dose calculated using the Calvert formula?
The Calvert formula calculates carboplatin dose as: Dose (mg) = Target AUC × (GFR + 25). GFR is estimated using the Cockcroft-Gault equation: for men, GFR = ((140 - age) × weight) / (72 × serum creatinine); for women, multiply the result by 0.85. The maximum recommended dose is capped at AUC × 150.
What is the target AUC for carboplatin?
Target AUC values typically range from 5 to 7 mg/mL/min depending on the chemotherapy regimen and the type of cancer being treated. Common targets are AUC 5 for previously treated patients and AUC 6-7 for previously untreated patients. Always follow your oncologist's prescribed target AUC.
What is the maximum recommended carboplatin dose?
The maximum recommended carboplatin dose is calculated with GFR capped at 125 mL/min for patients with normal renal function. The formula is: Maximum dose (mg) = Target AUC × 150. This prevents overdosing in patients with very high creatinine clearance.
When should adjusted body weight be used for carboplatin dosing?
For overweight or obese patients with BMI ≥ 25 kg/m², consider using adjusted body weight: adjusted BW = IBW + 0.4 × (actual BW - IBW), where IBW is ideal body weight. This accounts for the distribution of carboplatin in body tissues and prevents both underdosing and toxicity.
What serum creatinine value should be used for patients with low creatinine levels?
For patients with low serum creatinine levels, a minimum creatinine value of 0.7 mg/dL should be used to avoid overestimation of GFR. This is particularly important in elderly, malnourished, or cachectic patients where low muscle mass can produce falsely low creatinine levels.
When should measured creatinine clearance be used instead of estimated GFR?
Measured creatinine clearance using EDTA or 24-hour urine collection should be considered when dosing at AUC greater than 6 or when using an uncapped creatinine clearance. Mathematical equations may be less accurate in patients with extreme body habitus, rapidly changing renal function, or critical illness.
What cancers is carboplatin used to treat?
Carboplatin is a chemotherapy medication used to treat various cancers including lung cancer (both small cell and non-small cell), ovarian cancer, brain cancer (especially in pediatric patients), head and neck cancers, and germ cell tumors. It is often used in combination with other chemotherapy agents.
How is carboplatin different from cisplatin?
Carboplatin and cisplatin are both platinum-based chemotherapy drugs, but carboplatin has a different toxicity profile. Carboplatin causes less nephrotoxicity (kidney damage) and neurotoxicity (nerve damage) than cisplatin, making it preferable for patients with renal impairment. However, carboplatin causes more myelosuppression (bone marrow suppression), particularly thrombocytopenia.