Startup Cost Calculator: How Much Runway Do You Actually Have?

Startup Cost Calculator: How Much Runway Do You Actually Have?

"How much money do I need to start this?" is the wrong first question. The right one is: "given what I have, how many months can I survive before running out?" That's runway, and it's the single most useful number a new founder can calculate before quitting a job or writing a check.

One-Time Costs vs. Recurring Costs

Startup expenses split cleanly into two buckets, and mixing them up is the most common budgeting mistake:

• •**One-time costs** are paid once to get off the ground — incorporation and legal fees, a website build, initial equipment, initial inventory.
• •**Recurring costs** repeat every month whether you make a sale or not — rent, software subscriptions, salaries, ongoing marketing spend.

One-time costs determine how much cash you burn before you even open your doors. Recurring costs determine how fast you burn through what's left after that.

The Runway Formula

Runway (months) = Available funding - Total one-time costs ÷ Monthly recurring costs

In plain terms: take your total savings or raised funding, subtract everything you'll spend once to launch, then divide what's left by your monthly burn rate. The result is how many months you can operate before the money runs out — assuming no revenue offsets any of it.

Why Founders Get This Wrong

• •**Forgetting to pay themselves.** If you plan to draw a salary from the business, it needs to be in the recurring-cost list — leaving it out makes runway look artificially long.
• •**Underestimating "small" recurring costs.** Software subscriptions, payment processing fees, and small tools add up faster than founders expect once tallied together.
• •**Ignoring the gap before revenue.** Runway calculated with zero incoming revenue is the conservative, safer number to plan around — don't assume day-one sales will offset burn.

Using the Startup Cost Calculator

The ToolzGo Startup Cost Calculator handles this math live in your browser:

• •List every one-time launch cost as a line item with its amount
• •List every recurring monthly cost the same way
• •Enter your available funding or savings
• •See your total startup cost, monthly burn rate, and runway in months, updating instantly as you type

What To Do With the Runway Number

If your runway is shorter than you expected, there are really only three levers: raise more funding, cut recurring costs (the fastest lever, since it directly extends every future month), or find revenue sooner. Re-run the calculator after each hypothetical change — cutting one $500/month subscription can add more runway than it seems, especially on a tight budget.

Frequently Asked Questions

Q: What counts as a one-time vs. recurring cost?

A: One-time costs are paid once to get started — equipment, incorporation fees, initial inventory, website build. Recurring costs repeat every month — rent, software subscriptions, salaries, and ongoing marketing spend.

Q: How is runway calculated?

A: Runway is your remaining funding (after subtracting one-time costs) divided by your monthly burn rate (total recurring monthly costs), giving the number of months your funding will last.

Q: Should I include my own salary as a cost?

A: Yes, if you plan to pay yourself from the business funds, include it as a recurring monthly cost so your runway estimate is realistic.

Once you know your runway, use the Equity Split Calculator if you're bringing on co-founders, and the Invoice Generator when you're ready to bill your first clients.

Calculate your startup runway in seconds, free.