Time in range, explained

Updated June 19, 2026

Time in range is the share of your readings that fell inside your target range over a chosen period, shown as a percentage. It answers a simple question: how much of the time were you where you wanted to be?

Why it is useful

An average can hide a lot. Two people can share the same average while one is steady and the other swings high and low. Time in range captures how much of your day was actually in range, which an average cannot.

A common goal

International guidance often points to spending a large share of the day in range, commonly cited as around 70 percent or more for many adults with type 1 diabetes. What matters most is your own trend over time, and the target you set with your care team.

Time in range depends on readings arriving across the whole day. A period with big gaps can make the number less representative.