TIR Hours/Day Calculator
Convert CGM Time in Range (TIR) percentage into practical daily and weekly time values.
Last updated on: March 30, 2026
Calculate TIR in Hours/Day
Clinical Significance
Time in Range (TIR) is the percentage of time glucose stays within the target range, commonly 70 to 180 mg/dL for many nonpregnant adults using CGM.
Converting TIR into hours and minutes makes CGM data easier to understand in practical daily terms and helps communication with patients and care teams.
Formula and Example
This calculator converts TIR percentage directly into time values using 24 hours per day and 7 days per week.
For example, 70% TIR corresponds to about 16.8 hours per day, which is usually rounded to about 17 hours per day.
Example: 70% TIR = 16.8 hours/day = 1,008 minutes/day = 117.6 hours/week.
Reference Interpretation
Clinical Notes
TIR is best interpreted together with time below range, time above range, glucose variability, and the clinical goals of the specific patient.
- A commonly cited CGM target for many nonpregnant adults is >70% TIR.
- Seventeen hours per day in range is a practical way to visualize the 70% target.
- TIR should be interpreted alongside hypoglycemia and hyperglycemia exposure, not by itself.
- Individual goals may differ in pregnancy, older adults, or high-risk patients.
This page has been medically reviewed by Dr. Khoulah Attia – PharmD, Immunology Specialist.