Guide

How to limit choices in Google Forms

Use FormGuard to limit Google Forms choices for appointment slots, sessions, volunteer roles, class seats, and signup quotas.

Quick answer

A total response cap is different from a choice quota.

A choice quota limits submissions selecting a particular option, such as Workshop A or Workshop B. Google Forms supports native closing by total response count or date and time; use that for a whole-form cap. FormGuard is a Google Forms add-on that helps owners manage separate quotas for individual choices.

Google’s native closing announcement

Manual workaround

Count selections and remove filled choices.

For a small signup, monitor responses in the linked Sheet, count each selected option, and edit the question when a choice fills. Keep the response history. This requires owner attention and cannot prevent simultaneous submissions.

First test

Try two choices on a copied form.

  1. Copy your form and use a single-choice question with Workshop A and Workshop B. Keep the copy away from real respondents.
  2. Install FormGuard, open the copied form, and launch the add-on using the Google Forms Add-ons icon.
  3. Configure a quota of one for Workshop A and two for Workshop B, then save the settings.
  4. Submit one test response selecting Workshop A. Allow the configured automation to run.
  5. Open a fresh respondent preview. Confirm Workshop A is no longer selectable while Workshop B remains available. If the result differs, stop and use support before launch.

Install FormGuard from Marketplace

Open the setup guide

Limits

Leave room for simultaneous responses.

Google Forms and choice quotas do not provide inventory locking, guaranteed seats, payments, or a booking database. Already-open forms may still submit a filled option. Use a safety buffer, monitor responses, and define an overflow process.

FAQ

Which control should I use?

Do I need an add-on just to close after 100 responses?

Start with Google Forms native response-count closing. Consider FormGuard when separate choices need separate quotas or you need its other operational controls.

Does a quota refresh options from Google Sheets?

A quota retires filled choices. For refreshing a list from a Sheet, check Choice Sync; choice syncing does not reserve seats.