Kossin Labs / Free tools

SaaS runway and LTV calculator

Put in a few numbers and see how long your cash lasts and what a customer is worth. Everything runs in your browser. Nothing is saved or sent.

Revenue

Current MRR ($) Paying customers Monthly churn (%) Gross margin (%) CAC, cost per new customer ($)

Cash

Cash in the bank ($) Monthly expenses ($)

Sample numbers are pre-filled. Replace them with yours.

Runway

–

Cash runs out around

–

Net burn per month

–

Revenue per customer (ARPU)

–

Customer lifetime

–

LTV (gross-margin based)

–

LTV : CAC

–

CAC payback

–

How it works

Net burn is monthly expenses minus revenue after cost of service (MRR × gross margin). Runway is cash divided by net burn. LTV is ARPU × gross margin ÷ monthly churn. CAC payback is CAC ÷ (ARPU × gross margin). It assumes flat revenue, so treat it as a quick snapshot, not a forecast.