📊 Free · no login · data stays in your browser

Startup Runway Calculator: Months of Cash Left & When to Raise

Know exactly how long your cash lasts. Enter cash in bank, monthly expenses and revenue with expected growth; the calculator projects cash month by month and tells you when you run out and when to start raising.

QUICK ANSWERRunway (months) = cash in bank ÷ monthly net burn, where net burn = expenses − revenue collected. ₹3 Cr cash with ₹35 L expenses and ₹12 L revenue gives a net burn of ₹23 L and about 13 months of runway. Start fundraising at least 6 months before cash runs out.

Net burn = Monthly expenses − Monthly revenue
Runway = Cash ÷ Net burn
Raise-by date = Cash-out month − fundraising time

Loading tool…

What the Startup Runway Calculator does

✅ Simple and growth-adjusted runway
✅ Cash-out month
✅ Start-fundraising-by date
✅ Month-by-month projection
✅ Default-alive signal

How to use the Startup Runway Calculator

STEP 1
Enter your numbers
Type the figures you know. Every field starts with a realistic example so you can see how it works.
STEP 2
Read the result instantly
Results, tables and the plain-English explanation update as you type. No submit button, no login.
STEP 3
Test scenarios
Change one assumption at a time (valuation, growth, dilution, exit) to see what really moves the outcome.
STEP 4
Share or save
Copy the summary, send it on WhatsApp or print to PDF for your co-founders, board or investment committee.

How much runway is enough?

Investors like to see 18–24 months of runway after a round, so the company can hit milestones before raising again. Below 12 months you should be raising or cutting; below 6 months options narrow fast.

Use cash actually collected, not invoiced revenue, and include annual payments (insurance, audit, software) spread monthly. Test a zero-growth case: if revenue stalls, how long do you have?

Worked example

₹3 Cr cash, ₹35 L monthly expenses, ₹12 L revenue growing 5% a month with expenses growing 2%: simple runway is about 13 months; with growth it stretches to roughly 17 months.

Frequently asked questions

What is a good runway for a startup?

18–24 months after raising is a common target; 12 months is the minimum before you should be actively fundraising.

What is the difference between gross burn and net burn?

Gross burn is total monthly spending. Net burn is spending minus cash revenue. Runway uses net burn.

How long does fundraising take?

Often 3–6 months from first meetings to money in the bank in India, longer in tight markets. Plan for 6.

Is this tool free? Do I need to sign up?

Yes. It is completely free, needs no login and has no usage limit. FastFee builds payment collection software; these startup and investor tools are free resources for founders, angels and fund managers.

Is my data private?

Yes. Everything you type stays in your own browser on this device (local storage). Nothing is uploaded to FastFee. Export or print a copy if you need to keep it.

Use it together with

Default Alive Calculator →Will current growth reach profitability before cash runs out, and what growth you need.Burn Multiple Calculator →Net burn ÷ net new ARR with ratings from amazing to bad and capital efficiency.Portfolio Dashboard, Runway Monitor & Risk Alerts →All portfolio companies on one screen with revenue, burn, runway, alerts and stake value.

Extend your runway by getting paid faster

Automatic WhatsApp and SMS payment reminders before and after due dates
UPI, payment links and AutoPay with live paid status and auto receipts
Built for subscription, fee and installment businesses across India

Try FastFee free →Mobile OTP signup. No card required.

More free startup metrics & health

Burn Multiple Calculator →Net burn ÷ net new ARR with ratings from amazing to bad and capital efficiency.Default Alive Calculator →Will current growth reach profitability before cash runs out, and what growth you need.Startup Financial Health Score →One score out of 100 from runway, growth, margin, burn multiple, retention, payback and concentration.CAC & LTV Calculator →CAC, LTV, LTV:CAC ratio and payback months from spend, churn and margin.SaaS Metrics Calculator →Full SaaS dashboard: MRR movement, ARR, NRR, GRR, logo churn, ARPU, payback, quick ratio, Rule of 40.Marketplace Metrics Calculator →Take rate, AOV, orders per buyer, repeat rate, contribution margin and buyer CAC.Fintech Metrics Calculator →Payments: take rate, revenue per user. Lending: NIM, ROA, NPA. Plus activation and CAC.D2C Metrics Calculator →AOV, ROAS, break-even ROAS, CAC, repeat share and CM1/CM2/CM3 for D2C brands.EdTech Metrics Calculator →Lead conversion, CAC, course gross margin, LTV:CAC and completion for EdTech startups.Consumer App Metrics Calculator →Stickiness, D1/D7/D30 retention vs benchmarks, ARPU, ARPPU, payer conversion and CPI.Startup Benchmark Tool →Growth, margin, burn multiple, NRR, payback, churn and runway vs median and top quartile.Revenue Quality Score →Score revenue on recurring share, contract length, concentration, margin, retention and DSO.Customer Concentration Calculator →Top 1, top 5 and top 10 revenue share, HHI index and concentration risk level.

Other free startup & investor tool categories

📈 Valuation & Cap Table →Pre and post-money, share price, SAFE and convertible note conversion, cap table, dilution, ESOP pool, vesting and secondary sales.📝 Term Sheet, Legal & Compliance →Term sheet generator and comparator, liquidation preference, anti-dilution, co-founder risk, compliance checklists and governance trackers.💰 Investor Returns →Investor return, MOIC, portfolio IRR (XIRR), exit scenarios, follow-on and pro-rata decisions, and power-law portfolio maths.🧭 Market Size & Competition →TAM SAM SOM with a sanity check, competitor positioning map, category saturation and a funding tracker for your space.🔍 Screening & Due Diligence →Deal screener and ranking, pitch deck review, thesis match, red flags, DD and data room checklists, founder checks and investment memos.🏦 Fund & Syndicate Management →Fund return simulator, management fee, carry waterfall, NAV, syndicate carry and allocation, commitments, capital calls, LP reports and fund expenses.🗂️ Portfolio Management →Portfolio dashboard with runway alerts, monthly MIS collection, investor update generator, follow-ups, value-add, hiring and exits.🤝 Deal Flow & Fundraising →Deal CRM with kanban pipeline, founder fundraising and round closing tracker, auto-tagger, duplicate detector and application form builder.🧾 Free business tools →GST invoices, payment reminders, UPI collection and cash flow tools.