Expansion MRR Calculator — Measure Upsell Velocity and Net Negative Churn

Calculate screen width and height from diagonal size and aspect ratio. Convert between inches and centimeters for displays, TVs, and monitors with instant dimension calculations.

Calculate DPI (dots per inch), image dimensions, and print sizes. Convert between pixels and physical dimensions for printing and displays.

Generate time-based one-time passwords from a TOTP secret key. Enter your base32 secret, choose a period and digit length, and get the current and next codes with a live countdown timer. Useful for testing and debugging 2FA integrations.

Format, validate, and inspect JSON Lines (JSONL) and NDJSON files. Validates each line individually, reports parse errors by line number, outputs compact JSONL or a pretty-print preview, and lets you download the cleaned file.

Generate Zod validation schema code from a JSON sample object. Infers z.string(), z.number(), z.boolean(), z.array(), z.object(), and z.null() types automatically. Handles nested objects, arrays of objects with optional field detection, and outputs copy-ready TypeScript with import and z.infer type alias.

Calculate the information-theoretic bit entropy of any password or API key. Detects character set pools automatically, shows the total number of possible combinations, and estimates crack time across five attack scenarios from rate-limited web logins to GPU cracking clusters.

Check TLS protocol version compatibility and cipher suite strength ratings against current best practices. Supports IANA and OpenSSL cipher names — rates each suite as Strong, Weak, or Deprecated and explains why.

Scan pasted text, code, or config files for accidentally exposed API keys, tokens, passwords, and private keys. Detects 50+ secret types across AWS, GitHub, Stripe, OpenAI, and more — all client-side, nothing leaves your browser.

Generate a unique webhook URL and receive live HTTP requests. Inspect request headers, method, body, and timestamp in real time. No account required — payloads are stored temporarily for debugging.

Calculate Annual Recurring Revenue, YoY growth rate, and net new ARR. Enter current and previous ARR (or MRR) with optional movement breakdown to get NRR and a visual ARR bridge.

Build and send HTTP API requests directly from your browser. Set method, URL, query params, headers, and body (JSON, raw, or form-encoded). View the response status, headers, and body — and copy an equivalent cURL command for terminal use. Free, browser-based, no proxy.

Calculate Customer Lifetime Value from ARPU, monthly churn rate, and gross margin. Get gross and net LTV, LTV:CAC ratio with benchmark rating, and a churn sensitivity table showing how LTV changes across different churn rates.

Calculate your Rule of 40 score by adding YoY revenue growth rate and EBITDA margin. See your tier (Elite / Healthy / Below Average), a visual gauge with the 40-point threshold, benchmark comparison against public SaaS companies, and a what-if table showing what growth or margin improvement is needed to reach 40, 50, or 60.

Calculate your Net Promoter Score from promoter, passive, and detractor survey response counts. Get your NPS score (-100 to +100), category rating, and side-by-side benchmark comparison against 10 industries.

Calculate gross and net burn rate by expense category. Enter monthly expense line items and MRR to get gross burn, net burn, cash efficiency ratio, and burn multiple — with a visual stacked breakdown showing where the money goes.

Calculate Monthly Recurring Revenue from subscription plan tiers and customer counts. Get total MRR, ARR, ARPU, and a visual tier breakdown showing each plan's contribution.