Tools

Free tools. Zero sign-up.

Small, fast calculators for founders and marketers — built by a senior engineer, no sign-up, no email wall. Every one shows its formula so you can trust the number.

Business

Margin calculator

Profit margin, markup, and discount in one tool. Enter cost and price, get the margin — or work backwards.

margin = (price − cost) ÷ price × 100

Marketing

CPM calculator

Cost per thousand impressions, solved any direction. Plug in two of cost, impressions, or CPM.

CPM = spend ÷ impressions × 1,000

SaaS

LTV : CAC calculator

Customer lifetime value, CAC payback, and the 3:1 ratio benchmark for SaaS — instantly.

ratio = LTV ÷ CAC (aim ≥ 3:1)

Engineering

Software cost calculator

What an MVP, SaaS, or custom build actually costs in 2026, against US/EU agency benchmarks.

estimate = base × complexity + features

Every calculator has a companion guide on the blog with 2026 benchmarks and the formula worked through. Need something custom built — not just measured? See services →

Contact

Let's build something great.

Open to Senior, Staff, and Founding Engineer roles — and select freelance engagements. Reply within 24 hours, CET timezone.

me@nayeemurrahman.com

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