Free SaaS metrics calculator
Why these metrics matter
Investors, boards, and your own 2am gut-check all speak the same three numbers: unit economics, runway, and growth. Nail LTV:CAC and you know every new customer pays for themselves. Know your runway and you know exactly how long you've got to hit the next milestone. Project your MRR and you can tell a growth story with receipts. This calculator turns all three into instant answers, so you spend less time wrestling formulas and more time actually building.
What are LTV:CAC, runway & MRR growth?
- LTV:CAC — customer lifetime value versus what it costs to acquire them. Around 3:1 is the healthy sweet spot; below 1:1 you're losing money on every signup.
- Runway — how many months of cash you've got left at your current burn. Cash in bank ÷ net monthly burn. Under ~6 months is usually "start the raise" territory.
- MRR growth — your monthly recurring revenue compounded forward. At 10% a month, $10k turns into roughly $31k in a year (and it shows the ARR too).
Features
- Three calculators in one — LTV:CAC, runway, and MRR growth
- Live results as you type, with a healthy / watch / fix read on every metric
- Sensible benchmarks baked in (the 3:1 rule, the 6-month runway line)
- 100% private — everything's processed in your browser, nothing uploaded
- Free, no sign-up, no catch
How to use it
- Pick a metric — LTV:CAC, Runway, or Growth.
- Type in your numbers (the defaults are there to get you rolling).
- Read the headline result plus the supporting figures.
- Check the verdict — a green heart means healthy, amber means keep an eye on it.
- Tweak the inputs to compare scenarios in seconds.
Loved by founders
"Bookmarked on day one. I check my runway here more than I check email now."
— Nadia K., seed-stage founder
"Finally, LTV:CAC without opening a spreadsheet and questioning my life choices."
— Tom R., solo founder
"Pulled it up live on an investor call to sanity-check a number. Clutch."
— Priya S., startup CEO
FAQ
How do I calculate LTV:CAC — and what's a good ratio?
Divide customer lifetime value by customer acquisition cost. Around 3:1 is the healthy benchmark — about three dollars back for every dollar spent acquiring a customer. Under 1:1 you're underwater; way above 3:1 can actually mean you're underspending on growth.
How do I calculate runway?
Cash in the bank ÷ your net monthly burn. So $250k with a $30k/mo burn is about 8 months. Under roughly six months is the signal to start raising yesterday.
How do I project MRR growth?
Take your current MRR and compound it by your monthly growth rate over the number of months. At 10% a month, $10k MRR becomes about $31k in a year — the calculator handles the compounding and shows the resulting ARR.
Do my numbers get sent anywhere?
Nope. It all runs locally in your browser — nothing is uploaded, stored, or logged. Refresh the page and it's gone.
Is the SaaS metrics calculator free?
Totally free, no sign-up, no catch.