> ## Documentation Index
> Fetch the complete documentation index at: https://e2b.manicule.dev/llms.txt
> Use this file to discover all available pages before exploring further.
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# How do I increase my concurrency limit? (/docs/faq/increase-concurrency)

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Related: [Do paused sandboxes count toward the concurrency limit?](/docs/faq/paused-sandboxes-concurrency.md), [Is there a limit on how many templates I can create?](/docs/faq/template-limit.md), [Can I make a template public so other projects can use it?](/docs/faq/public-templates.md), [Can I run sandboxes in the EU?](/docs/faq/eu-region.md), [Why does iptables fail with 'xt_owner module missing' in a sandbox?](/docs/faq/iptables-xt-owner.md), [Why does pip install fail when building a template?](/docs/faq/pip-install-error.md)

You can raise your number of [concurrent sandboxes](/docs/billing#plans) by purchasing self-serve concurrency add-ons from the [dashboard billing tab](https://e2b.dev/dashboard?tab=billing).

For higher limits at lower prices, commit to a minimum monthly usage for a year on the [Enterprise plan](/docs/billing#plans) by [contacting sales](mailto:enterprise@e2b.dev).

<AccordionGroup>
<Accordion title="How much concurrency does each add-on add, and what's the self-serve maximum?">Each add-on adds 500 concurrent sandbox slots. On the Pro tier, you can scale this way up to 1,100 concurrent sandboxes. To go higher, you need an Enterprise plan.</Accordion>

<Accordion title="What's the per-unit pricing?">$500/month per add-on (500 slots), charged on top of your usage bill.</Accordion>

<Accordion title="Does the increase take effect immediately?">Yes. The higher limit applies as soon as you purchase the add-on, with no provisioning delay.</Accordion>

<Accordion title="Can I scale the add-ons back down later?">Yes. Add-ons are billed monthly and are non-refundable, but you can remove one to stop future charges, so you are not locked in beyond the current billing period.</Accordion>

<Accordion title="How is a mid-cycle purchase billed?">The dashboard shows the exact amount you will be charged before you confirm the purchase.</Accordion>
</AccordionGroup>