Depression PHQ Calculator - PHQ-9 Score and Severity

A depression phq calculator turns the nine-item Patient Health Questionnaire (PHQ-9) into a single 0 to 27 score and a standard severity band, so a person can prepare for a clinical conversation or track how symptoms change. The PHQ-9 maps each of the nine DSM-based depression symptoms to a 0 to 3 frequency scale for the last two weeks, which makes it one of the most widely used adult depression screens.

• • Pre-visit self-check: Rate the nine PHQ-9 items before a primary-care appointment so the conversation can start from a documented number.
• • Treatment tracking: Repeat the 0 to 27 score after a medication change or therapy milestone to compare against the baseline.
• • Population screening: Use the standard 0 to 27 total and the Kroenke/Spitzer bands as a structured adult depression screen in clinics.
• • Safety follow-up planning: Spot any non-zero answer on item 9 so the next step includes immediate clinical follow-up.

The PHQ-9 was developed in 1999 as part of the PRIME-MD diagnostic instrument and validated in two 2001 studies by Kroenke, Spitzer, and Williams. The U.S. Preventive Services Task Force names it as an example of an adult depression screen with adequate supporting evidence.

For people whose depression picture is tangled with sleep loss or daytime fatigue, pairing the PHQ-9 with the Epworth Sleepiness Scale Calculator gives a second structured score for the same two-week window.

The PHQ-9 total is the sum of the nine item scores, where each item is rated 0 to 3 for how often the symptom has bothered the respondent over the last two weeks. The calculator then maps the total to one of the five Kroenke/Spitzer severity bands and shows a safety flag whenever item 9 is greater than zero.

• item 1: Little interest or pleasure in doing things (0-3).
• item 2: Feeling down, depressed, or hopeless (0-3).
• item 3: Trouble with sleep (0-3).
• item 4: Feeling tired or having little energy (0-3).
• item 5: Poor appetite or overeating (0-3).
• item 6: Feeling bad about yourself or feeling like a failure (0-3).
• item 7: Trouble concentrating (0-3).
• item 8: Moving or speaking slowly, or being fidgety and restless (0-3).
• item 9: Thoughts of being better off dead, or of hurting yourself (0-3).

Each item uses the same response set: 0 means not at all, 1 means several days, 2 means more than half the days, and 3 means nearly every day. The total can be anywhere from 0 to 27.

The five severity bands are 0 to 4 minimal, 5 to 9 mild, 10 to 14 moderate, 15 to 19 moderately severe, and 20 to 27 severe. According to the American Psychological Association PHQ-9 patient summary, the same bands and total range are used to talk about depression severity.

According to American Psychological Association PHQ-9 patient summary, each of the nine items is scored 0 to 3 for the last two weeks, and the total falls into five severity bands: 0 to 4 minimal, 5 to 9 mild, 10 to 14 moderate, 15 to 19 moderately severe, and 20 to 27 severe

Four recurring ideas shape how the PHQ-9 score is read: the response set, the severity bands, the safety role of item 9, and the relationship to the shorter PHQ-2.

Like the PHQ-9, the Aldrete Score Calculator is a structured post-event score that turns a checklist of signs into a single number, so the same approach of tracking change over time applies to both.

The PHQ-9 is meant to be answered as a snapshot of the last two weeks, not a life review. The calculator does the math, but the conversation about the result still belongs to a clinician.

1. 1 Set the time frame: Read every item as a question about the last two weeks, not the last day or year.
2. 2 Pick one answer per item: Choose 0 (not at all), 1 (several days), 2 (more than half the days), or 3 (nearly every day) for each item.
3. 3 Add the nine ratings: The calculator sums the nine item scores to a 0 to 27 total. No item is weighted differently.
4. 4 Read the severity band: Match the total to the five standard bands: 0-4 minimal, 5-9 mild, 10-14 moderate, 15-19 moderately severe, 20-27 severe.
5. 5 Check the item 9 flag: If the self-harm item is non-zero, treat that as a separate safety note and talk with a clinician.
6. 6 Bring the score to a visit: Use the total, band, and safety flag as a starting point for the next clinical conversation.

A person who rates anhedonia as 2, depressed mood as 3, sleep trouble as 2, low energy as 2, appetite change as 2, self-criticism as 2, concentration as 1, slow speech as 1, and self-harm thoughts as 0 gets a total of 15. The calculator labels that 'Moderately severe' and suggests an active treatment plan. Repeating the score in two to four weeks shows whether treatment is moving.

When the same person also screens positive for unhealthy alcohol use, the Audit Test Calculator covers the related WHO risk bands and gives a parallel 0 to 40 severity total.

A standardized self-report score is useful in several real workflows, from a first primary-care visit to ongoing treatment tracking.

• • Documented number for the visit: The 0 to 27 total gives a primary-care visit a starting point that is easier to discuss than a vague feeling of being low.
• • Standard adult screen: The PHQ-9 is one of the depression screens the U.S. Preventive Services Task Force uses as an example for adult screening.
• • Easy to repeat: The same nine items can be answered every two to four weeks, so a clinician can compare a new total against a baseline to see whether treatment is working.
• • Bands guide the level of care: The five Kroenke/Spitzer bands map roughly to watchful waiting, treatment planning, active treatment, and expedited referral.
• • Item 9 forces a safety check: The self-harm item sits inside the score, so any non-zero answer triggers same-day follow-up.

When depression is severe enough to limit daily activities, a clinician often adds a functional measure such as the Barthel Index to track how the PHQ-9 score lines up with self-care and mobility.

A PHQ-9 total is a snapshot of self-reported symptoms, so several real-world factors can move the score without changing the underlying condition.

• • The PHQ-9 is a screening tool, not a diagnostic test. A clinical interview is still needed to confirm major depressive disorder or to rule out bipolar disorder, grief, substance-induced mood changes, or medical causes of low mood.
• • The total alone can hide serious risk. A non-zero response on item 9 should trigger same-day clinical follow-up regardless of the rest of the score.

These factors are why the same total can mean different things at different times. A clinician reads the total, the item pattern, and the safety flag together.

According to U.S. Preventive Services Task Force, the PHQ-9 is among the depression screening instruments the task force names for use in adults when systems are in place to ensure accurate diagnosis, effective treatment, and appropriate follow-up

When substance use is part of the picture, the Addiction Calculator can help frame a parallel risk conversation before the PHQ-9 follow-up visit.