Calculator Form
Example Data Table
| Patient | Weight | Regimen | mg/kg | Exact dose (mg) | Rounded dose (mg) | Volume (mL) | Example vial coverage |
|---|---|---|---|---|---|---|---|
| Amina | 62 kg | CRC first line | 5 | 310 | 310 | 12.4 | 4 mL + 16 mL coverage |
| Bilal | 74 kg | NSCLC | 15 | 1110 | 1110 | 44.4 | 3 × 400 mg |
| Hira | 81 kg | Glioblastoma | 10 | 810 | 810 | 32.4 | 2 × 400 mg + 1 × 100 mg |
| Kamran | 55 kg | Cervical cancer | 15 | 825 | 830 | 33.2 | 2 × 400 mg + 1 × 100 mg |
Example values are illustrative. Clinical use requires protocol review, current labeling, and pharmacy verification.
Formula Used
Exact dose per cycle (mg) = Body weight in kilograms × Selected dose in mg/kg
Rounded dose (mg) = Exact dose adjusted by the chosen rounding step and rounding mode
Volume to withdraw (mL) = Rounded dose ÷ 25 mg/mL
Opened vial strength (mg) = (400 × number of 400 mg vials) + (100 × number of 100 mg vials)
Estimated leftover (mg) = Opened vial strength − Rounded dose
Cumulative dose (mg) = Rounded dose per cycle × Planned cycles
How to Use This Calculator
- Enter body weight and choose kilograms or pounds.
- Select a built-in regimen or use the custom plan option.
- Confirm dose intensity, cycle interval, and planned number of cycles.
- Choose a rounding step and the desired rounding method.
- Select whether the infusion is first, second, or later.
- Press Calculate Dose to display the result above the form.
- Review dose, volume, infusion timing, vial coverage, waste, and cumulative totals.
- Use the CSV or PDF buttons to export the displayed result.
Frequently Asked Questions
1. Is this calculator enough to approve treatment?
No. It is a planning aid. Final use requires oncology orders, indication review, current labeling, institutional protocol, patient-specific safety checks, and pharmacy confirmation.
2. Why is weight converted to kilograms?
Bevacizumab dosing is commonly expressed in mg/kg. Converting pounds to kilograms keeps the calculation consistent and avoids manual conversion errors.
3. Why are there different regimen presets?
Different disease settings use different dose intensities and intervals. Presets speed data entry and reduce transcription mistakes when reviewing common labeled schedules.
4. What does rounding change?
Rounding affects the prepared dose, withdrawn volume, vial coverage, leftover estimate, and cumulative totals. Use your institution’s rounding policy when selecting the step.
5. Why does the calculator show vial coverage and leftover?
That view helps estimate how many vial strengths may need opening for each cycle and the theoretical unused amount after dose preparation.
6. Do infusion times stay the same for every dose?
Not always. Initial and later infusions may differ if previous infusions were tolerated. This calculator uses the selected infusion stage for timing estimates only.
7. Does the chart change with more cycles?
Yes. The chart plots the same per-cycle dose across the planned schedule and shows how cumulative exposure rises over time.
8. Can I use this for off-label protocols?
You can enter a custom dose and interval for planning, but any nonstandard schedule must be reviewed carefully against specialist guidance and local policy.