Ecommerce Startup Runway Calculator

Calculate runway against real ecommerce benchmarks. The relevant benchmark here is 12-18 months — inventory cycles compress runway fast.

Typical starting inputs

This page starts from $60,000/mo burn, $120,000/mo revenue, 38% gross margin, and 8% monthly growth — adjust them to match your books.

What Ecommerce founders should watch

Inventory absorbs cash before revenue lands. Treat inventory days outstanding as a runway lever.
Cash conversion cycle, not just net burn, is the real runway constraint.
Returns and RTO (return-to-origin) above 25% can silently double effective CAC.

Burn multiple

Ecommerce runway is dominated by working capital. A 60-day inventory cycle plus 30-day payment terms can lock 90 days of revenue away from your bank account.

When to raise

Most ecommerce founders raise debt or revenue-based financing, not equity, to fund inventory. Equity is for brand and channel investment.

What usually goes wrong

Channel concentration on a single ad platform.
Rising shipping and fulfillment cost per order.
COD orders with high RTO percentage in cash-on-delivery markets.

Related free tools

Also try the startup runway calculator, the survival simulator, the default alive or default dead test, and the AI CFO — all free, no account required. When you're ready for live data and ongoing forecasts, sign up for FounderConsole.