Tramadol Dosage Calculator

Estimate a per-dose amount, dosing interval, and maximum daily tramadol dose from FDA prescribing-information rules for age, formulation, and renal or hepatic function.

Quick Facts

Standard IR ceiling
400 mg/day
50-100 mg every 4-6 hours in adults with normal renal and hepatic function, per FDA labeling.
Renal/hepatic caps
200 mg or 100 mg/day
CrCl below 30 mL/min lowers the ceiling to 200 mg/day; severe hepatic impairment lowers it to 100 mg/day, both spaced every 12 hours.
Age 75+ ceiling
300 mg/day
FDA labeling caps total daily IR dose at 300 mg for patients older than 75, even with normal organ function.

Your Results

Calculated
Per-dose amount
-
IR: mg per dose | ER: daily start
Dosing interval
-
Time between doses
Maximum daily dose
-
24-hour ceiling
Doses per day
-
At the per-dose ceiling

Ready

Enter age, formulation, and organ function, then calculate the FDA-labeled dosing range.

About the Tramadol Dosage Calculator

Tramadol is an opioid analgesic, and its labeled adult dosing is a fixed set of rules published in the FDA prescribing information rather than a single continuous equation. This calculator applies those rules — per-dose range, dosing interval, and 24-hour ceiling — for immediate-release (IR) and extended-release (ER) tramadol, adjusted for age, renal function, and hepatic function. It is intended for education and record-keeping, not for prescribing.

How the dosing rules work

For opioid-naive adults with normal kidney and liver function, immediate-release tramadol is labeled at 50 to 100 mg every 4 to 6 hours as needed, not to exceed 400 mg per day. Extended-release tramadol starts at 100 mg once daily and can be titrated upward by 100 mg increments no more often than every 5 days, up to a maximum of 300 mg per day.

Adjustments for age and organ function

  • Age over 75: the total daily IR dose should not exceed 300 mg per day, even with normal renal and hepatic function.
  • Renal impairment (CrCl below 30 mL/min): IR dosing shifts to 50-100 mg every 12 hours, with a 200 mg daily ceiling; extended-release tramadol is not recommended.
  • Severe hepatic impairment (e.g., cirrhosis): the labeled IR regimen is a fixed 50 mg every 12 hours, a 100 mg daily ceiling; extended-release tramadol is not recommended.

When more than one adjustment applies, the calculator uses the most conservative rule: hepatic impairment first, then renal impairment, then the age-75 cap, then standard dosing.

Important disclaimer

This tool performs label-based dosing arithmetic only. It does not know a patient's full history, other medications, or clinical context, and it does not constitute medical advice. Tramadol dosing, initiation, and titration should always be determined by a licensed prescriber.

Frequently Asked Questions

What is the standard adult tramadol dose?
For immediate-release tramadol in adults with normal kidney and liver function, the FDA-labeled range is 50 to 100 mg every 4 to 6 hours as needed, not to exceed 400 mg per day. Extended-release tramadol starts at 100 mg once daily and may be titrated by 100 mg every 5 days up to 300 mg per day.
How does kidney or liver function change the dose?
With creatinine clearance below 30 mL/min, the interval widens to every 12 hours and the daily ceiling drops to 200 mg. With severe hepatic impairment, such as cirrhosis, the labeled regimen is a fixed 50 mg every 12 hours, for a 100 mg daily ceiling. Extended-release tramadol is not recommended in either situation.
Does age change the maximum daily dose?
Yes. For patients older than 75, FDA labeling caps total daily immediate-release dosing at 300 mg per day even when kidney and liver function are normal, and extended-release titration should start at the low end and proceed cautiously.

Related calculators