KarobarKit
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Startup · Local-first · Beta

LTV Calculator

Illustrate simple subscription LTV using ARPU, gross margin and a churn sensitivity range.

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Tier B · Runs locally in this browser
Method
Simple subscription LTV using ARPU multiplied by gross margin and divided by monthly churn.
Illustrated LTV = monthly ARPU × gross margin ÷ monthly customer churn.
Sources
1 reviewed reference
Open the source register
Effective period
Formula-based; no statutory effective period
Last verified
10 August 2026
Review every 365 days
Reviewer status
Startup metrics reviewer: external review pending
Privacy
Startup inputs and results stay in this browser. They are not sent to analytics, a backend, a URL or a log, and are not saved by default. These outputs are user-entered scenarios, not recommendations or professional valuations.
Important limitations
  • The simple model excludes expansion, contraction, retention curves, cohorts, refunds, taxes and discounting.
  • Churn must be observed and stable enough for the scenario to be useful.

Read all limitationsReport an error

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A quick guide

Use the number with context

The answer is only useful when you know what it includes and what it leaves out.

How to use it

  1. Enter monthly arpu using the same period and unit as the other inputs.
  2. Enter gross margin using the same period and unit as the other inputs.
  3. Enter base monthly customer churn using the same period and unit as the other inputs.
  4. Enter low churn scenario using the same period and unit as the other inputs.
  5. Enter high churn scenario using the same period and unit as the other inputs.
  6. Choose churn stability using the option that matches your scenario.

Formula

Illustrated LTV = monthly ARPU × gross margin ÷ monthly customer churn.

The range shows sensitivity to churn assumptions; it is not a precise forecast of future cash flows.

Make it concrete

Worked example

₹2,000 ARPU at 70% gross margin and 5% monthly churn illustrates ₹28,000 of LTV.

Boundaries

What this tool does not assume

Limitations

  • The simple model excludes expansion, contraction, retention curves, cohorts, refunds, taxes and discounting.
  • Churn must be observed and stable enough for the scenario to be useful.

Edge cases

  • Zero or unstable churn is not treated as infinite or certain LTV.
  • Low and high churn must bracket the base churn.

Last reviewed 10 August 2026 · Formula version 1.0

Method & sources

How this result is grounded

The formula is deterministic and runs in your browser. Read the reference below for the method used by this tool.

  • Startup and SaaS metrics methodology v1

    KarobarKit controlled methodology · authoritative reference · Checked 10 August 2026

    Supports: startup metrics definitions · scenario boundaries · period consistency

Questions

Frequently asked

Why does churn dominate LTV?

The simple model divides contribution per customer by monthly churn, so small churn changes can materially change the illustration.

Is this a forecast?

No. It is a sensitivity scenario based on your ARPU, margin and churn assumptions.

Keep going

Related tools

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Source register checked 10 August 2026.