Know how long your survey really takes
Upload your questionnaire and get a reliable completion time. Question detection is automatic; duration is calculated by the SurveyLength model.
Three ways to estimate your survey length
Enter counts manually
Type the number of questions per type. Nothing leaves your browser.
Open the calculator →Upload a questionnaire
PDF, Word or Excel document. Questions are detected, then you review the summary.
Upload a file →Paste a survey link
Public Microsoft Forms or Google Forms link: questions are read from the live survey.
Analyse a link →How it works
Start with question counts, a questionnaire file or a public survey link. Each method uses the same SurveyLength calculation model.
Choose your starting point
Enter question counts in the calculator, upload a PDF, Word or Excel questionnaire, or paste an open survey’s participation link. Restricted or page-by-page surveys may not be read completely.
Review the summary and audience
For a file or link, review the counts by question type, detected language and proposed times for unclassified questions. Set the number of respondents and age distribution before calculating. In the calculator, enter these details yourself.
Calculate and export your estimate
See the main duration with its lower and upper estimates. When filters are detected in a file or link, the estimate assumes half the respondents see the questions shown to only some of them. Export a PDF summary without the questions.
AI reads files and survey links to identify question types and available filter instructions. It does not invent the duration: the deterministic SurveyLength model calculates it from the structure and audience settings.
Deterministic results
The same questionnaire always returns the same time. Timings come from the SurveyLength formula, not from an AI guess.
Audience aware
Age distribution, sample size and language group all change reading and answering speed.
Full control
Review the detected question summary, or enter counts manually.
Routing ready
Split respondents across up to three paths to model screeners and skip logic.
Built on survey research
SurveyLength uses a specialized, deterministic survey-duration estimation model.
Why survey length matters
Participation, drop-off, data quality and cost — what length does to your study.
Learn why survey length matters →Help & methodology
How the engine calculates the estimate, and the question types it works with.
Explore the methodology →Research & citations
Peer-reviewed articles and theses that used SurveyLength to plan their surveys.
Research & citations →