Runway Calculator

What is Runway Calculator?

Estimate how many months a startup or project can operate from cash balance and monthly burn.

• Calculate profit, break-even points, and cash runway for small businesses, indie products, or projects.
• Compare how pricing, cost, and volume changes affect cash flow.
• Build a simple model for budgeting, inventory, hiring, or fundraising cadence.

Scope and country basis

This tool is formula-based and can be used in any country if you keep the currency and time period consistent.

The country/currency selector changes money formatting. The calculation itself depends on the business metrics, rates, and assumptions you enter.

What each input means

Cash balance

Money field, formatted in the selected currency.

Monthly burn

Money field, formatted in the selected currency.

Formula and interpretation

The core formula is: Runway = Cash balance / Monthly burn. If a country/currency selector is available, money is formatted for that market. Policy-sensitive fields use the selected market where implemented, otherwise they remain user-entered assumptions.

Use the result for first-pass comparison, budgeting, scenario planning, and discussion prep. Before filing taxes, applying for credit, buying insurance, or investing, verify the result against local rules, contracts, and professional advice.

Key concepts

Key inputs for this tool

Runway Calculator mainly depends on Cash balance, Monthly burn. Keep time period, currency, and definitions consistent before comparing outputs.

Fixed cost

Costs that do not move directly with volume shape break-even pressure and runway.

Variable cost

Costs incurred per unit shape contribution margin.

Cash flow

Profit does not guarantee cash safety when collection timing and inventory matter.

How to read the result

• Read the core Runway Calculator output first, then the supporting metrics and scenarios rather than cherry-picking one favorable number.
• Check whether output covers fixed cost with a margin of safety.
• Stress-test revenue growth and cost increases together.
• If runway is short, focus on controllable cost and cash collection.

How to use it

1. Enter revenue, cost, price, volume, or cash balance.
2. Review profit, break-even point, runway, or cash-flow output.
3. Adjust price, cost, and volume to compare operating scenarios.
4. Before budgeting or operating decisions, verify fixed costs, taxes, inventory, and cash collection timing.

Common mistakes

• Treating profit and cash flow as the same.
• Missing labor, tax, platform fees, inventory, or refunds.
• Using average cost when marginal cost matters.

Suggested workflow

1. Build the operating baseline.
2. Test price, volume, cost, or collection changes.
3. Use results in budget, inventory, and hiring cadence.

Method and review boundary

This calculator runs a local estimate from the inputs and formula shown on this page. It does not retrieve live rules, rates, underwriting decisions, or quotes from banks, tax authorities, insurers, or other providers. Last reviewed: July 24, 2026.

For tax, lending, insurance, retirement, investment, or contract decisions, verify official guidance, the relevant agreement, and a formal quote for your location. Use this result to compare scenarios and prepare questions, not as financial, tax, investment, or legal advice.

Method notes and official sources

Runway equals the user-entered cash balance divided by the entered monthly burn. Burn should be a consistent net cash outflow after recurring inflows; the static result does not forecast revenue, collections, financing, taxes, debt service, one-time spending, seasonality, changing costs, or minimum cash reserves.

The page calculates locally only from user-entered values. It does not connect to lenders, tax authorities, ad platforms, insurers, bank accounts, or other live data sources. Results are estimates, not an approval, offer or quote, tax or insurance determination, or financial, tax, insurance, legal, or investment advice. Currency selection changes formatting only and does not perform FX conversion.

• Stripe Atlas: Cash runway and net monthly burn - Stripe Atlas
• FDIC Money Smart for Small Business: Managing Cash Flow - Federal Deposit Insurance Corporation
• SBA: Manage business finances and cash-flow projections - U.S. Small Business Administration

Sources checked July 27, 2026. These are government, regulatory, standards-body, or first-party product references. Laws, tax rates, loan and insurance terms, platform metrics, and official pages can change; verify the applicable authority, contract, policy, loan documents, and platform account before a formal decision.

FAQ