# Sandbox cost estimator

Estimate a monthly sandbox compute bill from run count, run length, sandbox size and a provider's published per-hour rates.

Use the tool on the [web page](https://agentsandboxes.fyi/tools/sandbox-cost-estimator). It works without JavaScript.

## How to use it

1. Enter sandbox runs per month.
2. Enter average run length.
3. Enter vcpu per sandbox.
4. Enter memory per sandbox.
5. Enter compute rate.
6. Enter memory rate.
7. Enter idle and retry allowance.
8. Read the result.

## How it works

We turn runs times seconds into sandbox-hours, multiply by your vCPU and GiB counts and the per-hour rates you set, then add a flat percentage for idle time, queueing and retries.

Default rates are mid-range published list prices checked on 2026-10-20: E2B and Daytona list $0.0504 per vCPU-hour and $0.0162 per GiB-hour; Fly Sprites $0.0385 per CPU-hour actually used; AWS AgentCore $0.0895 per vCPU-hour; Vercel Sandbox $0.128 per active CPU-hour; Modal $0.1419 per physical core-hour; Cloudflare $0.072 per active vCPU-hour.

Providers meter differently — per second, per 10ms of active CPU, per GB-RAM-second or per request — and plan limits, included usage, storage and egress change the real bill.

> Estimates only. Metering units, included usage, storage and egress differ per provider; check the linked pricing page before you commit.

## Questions

### Are storage and egress in the estimate?

No. They are metered separately by most providers; add them to the overhead allowance or compute them from the provider's pricing page.

### Why is my real bill lower than the estimate?

Some providers bill only active CPU or scale a sandbox to zero while it waits on the model. If your runs idle a lot, lower the compute hours or the allowance.

### Where do the default rates come from?

Each provider's public pricing page; the listing rows in this index link to the cited page for each rate.

> **Check before you choose.** Vendor specs and prices change. Follow the cited source on each listing before you pick a provider.