Deterministic survey length calculator

Know how long your survey really takes

Describe your questionnaire and audience to estimate completion time with the SurveyLength model used by researchers for years.

No account needed · No questionnaire upload

How it works

Enter question counts, matrix rows, ranking items and reading words.

Choose the language, age distribution and sample size for your study.

The deterministic SurveyLength model calculates the duration and its lower and upper estimates.

The same questionnaire always returns the same time. Timings come from the SurveyLength formula, not from an AI guess.

Age distribution, sample size and language group all change reading and answering speed.

Adjust your question counts, reading texts and audience characteristics at any time.

Split respondents across up to three paths to model screeners and skip logic.

SurveyLength uses a specialized, deterministic survey-duration estimation model.

Participation, drop-off, data quality and cost — what length does to your study.

How the engine calculates the estimate, and the question types it works with.

Peer-reviewed articles and theses that used SurveyLength to plan their surveys.

Get an estimate you can share with clients and field teams before your survey goes live.