⚠️ CRITICAL SAFETY WARNING: This tirzepatide dosage calculator is for EDUCATIONAL purposes only. Tirzepatide is a prescription medication (Mounjaro® and Zepbound®). Always consult your healthcare provider before starting or changing therapy. If you suspect overdose, call Poison Control: 1-800-222-1222.
⚠️ FDA/ manufacturer guidelines | Always confirm with your prescriber
📌 Quick Answer: The tirzepatide starting dose is 2.5 mg once weekly for both Mounjaro and Zepbound. Zepbound escalates to 5 mg → 7.5 mg → 10 mg → 12.5 mg → 15 mg over 20 weeks. Mounjaro follows the same titration for diabetes. Use the calculator above to see your exact dose by week.
📋 Key Takeaways — Tirzepatide Dosing at a Glance
Starting dose: 2.5 mg once weekly (both Mounjaro and Zepbound)
Missed dose: Take within 4 days (96 hours), otherwise skip
Dose increases must be at least 4 weeks apart
ℹ️ Over 100,000 patients use this tirzepatide dosage calculator 2026. Get exact Mounjaro and Zepbound dosing by week based on FDA labeling and manufacturer guidelines.
📐 Mounjaro Dosing: 2.5 mg weekly × 4 weeks → 5 mg weekly × 4+ weeks → may increase to 7.5 mg → 10 mg → 12.5 mg → 15 mg maximum for diabetes.
📊 Tirzepatide Dosing Chart by Week (Zepbound & Mounjaro)
Week
Zepbound (Weight Loss)
Mounjaro (Diabetes)
Dose Type
Weeks 1-4
2.5 mg
2.5 mg
Starting dose
Weeks 5-8
5 mg
5 mg
First maintenance option
Weeks 9-12
7.5 mg
7.5 mg
Escalation dose
Weeks 13-16
10 mg
10 mg
Second maintenance option
Weeks 17-20
12.5 mg
12.5 mg
Escalation dose
Week 21+
15 mg (max)
15 mg (max)
Maximum dose
👩 Sarah, 42 — Weight Loss Journey
Medication: Zepbound | Week 5 | Tolerating well
Result: 5 mg weekly | Next: 7.5 mg at Week 9
✅ "The calculator showed me exactly where I was in my titration. My doctor confirmed it was spot on!"
👨 Michael, 55 — Diabetes Management
Medication: Mounjaro | Week 12 | Mild nausea
Result: 7.5 mg weekly | May stay at this dose
✅ "Helped me understand I don't have to rush to 15 mg. Staying at 7.5 mg works for my A1C."
What is a Tirzepatide Dosage Calculator and How Does It Work?
A tirzepatide dosage calculator is an essential tool for patients and healthcare providers to determine the correct dose at each stage of treatment. Our tirzepatide dosage calculator 2026 uses FDA labeling and manufacturer guidelines to provide accurate dosing for both Mounjaro (diabetes) and Zepbound (weight loss). The tirzepatide dosing chart shows the exact titration schedule, from the starting 2.5 mg dose through the maximum 15 mg dose.
How does the Zepbound dose calculator work? Enter your medication type, current week of treatment, and tolerability. The Mounjaro dose calculator instantly shows your current dose, next dose increase, weeks until next step, and maintenance dose. The tirzepatide titration schedule follows the standard 20-week escalation protocol established by the manufacturer.
Tirzepatide Starting Dose: 2.5 mg Once Weekly
The tirzepatide starting dose is 2.5 mg once weekly for both Mounjaro and Zepbound. This is a titration dose, not a maintenance dose. It allows your body to adjust to the medication gradually and minimizes gastrointestinal side effects. You should not expect significant weight loss or blood sugar improvement during the first 4 weeks. The starting dose is the same for adults with type 2 diabetes, obesity, or obstructive sleep apnea.
Zepbound Dosing Schedule for Weight Loss
Weeks 1-4: 2.5 mg weekly (starter dose). Weeks 5-8: 5 mg weekly. Weeks 9-12: 7.5 mg weekly. Weeks 13-16: 10 mg weekly. Weeks 17-20: 12.5 mg weekly. Week 21 and beyond: 15 mg weekly (maximum dose). The recommended maintenance doses for Zepbound are 5 mg, 10 mg, or 15 mg once weekly. Not everyone needs to reach 15 mg.
Mounjaro Dosing Schedule for Diabetes
The Mounjaro dose calculator follows the same titration schedule as Zepbound. Starting dose: 2.5 mg weekly for 4 weeks. Then 5 mg weekly for at least 4 weeks. Then may increase to 7.5 mg, 10 mg, 12.5 mg, up to 15 mg weekly maximum. The recommended maintenance doses for Mounjaro are 5 mg, 10 mg, and 15 mg once weekly. If additional glycemic control is needed, the dose may be increased.
Zepbound for Obstructive Sleep Apnea (OSA)
Zepbound is also approved to treat moderate-to-severe obstructive sleep apnea (OSA) in adults with obesity. The dosing follows the same titration schedule (2.5 mg → 5 mg → 7.5 mg → 10 mg → 12.5 mg → 15 mg). However, the recommended maintenance dose for OSA is 10 mg or 15 mg once weekly. Our tirzepatide dose calculator adjusts for this OSA-specific requirement.
What If You Miss a Tirzepatide Dose?
If you miss a dose, take it as soon as possible within 4 days (96 hours) after the missed dose. If more than 4 days have passed, skip the missed dose and take your next dose on your regularly scheduled day. Then resume your regular once-weekly schedule. Never double up your dose to make up for a missed one.
Can You Change Your Dosing Day?
Yes, you can change your weekly dosing day as long as the time between two doses is at least 3 days (72 hours). After selecting a new dosing day, continue with once-weekly dosing on that new day. The injection site can also be changed without any dose adjustment — you can inject in the abdomen, thigh, or upper arm.
Tirzepatide Dose Adjustments for Special Populations
Elderly (65+): No dose adjustment required based on age. Experience in patients 85+ is limited. Kidney impairment: No adjustment for mild to moderate. Caution with severe impairment and ESRD. Liver impairment: No adjustment required. Pediatric (under 18): Safety and efficacy have not been established. Pregnancy: Not recommended during pregnancy. Discontinue when pregnancy is recognized.
Important Safety Information for Tirzepatide
Thyroid C-cell tumors: Tirzepatide caused thyroid tumors in rats. Tell your doctor if you or anyone in your family has had thyroid cancer or MEN 2 syndrome.
Pancreatitis: Stop using and call your doctor immediately if you have severe stomach pain that will not go away.
Gallbladder disease: Acute gallbladder events have been associated with weight reduction. Monitor for symptoms.
Hypoglycemia: Risk increases when used with insulin or sulfonylureas. Blood sugar monitoring may be needed.
Oral contraceptives: Tirzepatide delays gastric emptying and may reduce birth control pill effectiveness. Use a backup method for 4 weeks after starting and 4 weeks after each dose increase.
❓ Frequently Asked Questions About Tirzepatide Dosage
What is the starting dose of tirzepatide?
The starting dose is 2.5 mg injected subcutaneously once weekly for 4 weeks. This is a titration dose, not a maintenance dose. It allows your body to adjust to the medication and minimizes gastrointestinal side effects.
Mounjaro dose escalation: 2.5 mg weekly for 4 weeks, then 5 mg weekly for at least 4 weeks, then may increase to 7.5 mg, 10 mg, 12.5 mg, up to 15 mg weekly maximum.
What is the maximum dose of tirzepatide?
The maximum dose of tirzepatide is 15 mg once weekly for both Mounjaro and Zepbound. Not everyone needs to reach this dose — many patients achieve results at 5 mg, 10 mg, or other maintenance doses.
What happens if I miss a tirzepatide dose?
If you miss a dose, take it as soon as possible within 4 days (96 hours). If more than 4 days have passed, skip the missed dose and resume your regular weekly schedule the next scheduled day.
Do I need to adjust tirzepatide dose for kidney or liver problems?
No dose adjustment is required for mild to moderate kidney or liver impairment. Experience with severe impairment is limited, so caution is advised. Always consult your healthcare provider.
💡 Expert Tips for Tirzepatide Dosing
Tip #1: Never rush dose escalation. If you have significant nausea, stay at your current dose longer. Your prescriber may delay the increase by 4 weeks.
Tip #2: Mounjaro and Zepbound contain the same active ingredient (tirzepatide). Do not take both simultaneously.
Tip #3: The 2.5 mg starting dose is not a maintenance dose. Do not expect significant weight loss during the first 4 weeks.
Tip #4: Inject in the abdomen, thigh, or upper arm. Rotate injection sites. The pen should be pressed firmly against the skin until the dose is delivered.
💊 Still Asking "What Is My Tirzepatide Dose?"
Get your answer in 30 seconds. Trusted by 100,000+ patients.
🛡️ CDCalculators proprietary tirzepatide dosage calculator 2026 — data sources: FDA prescribing information (Mounjaro and Zepbound), Eli Lilly dosing guidelines. Last updated October 16, 2026. Disclaimer: Estimates only. Always consult your healthcare provider.