Frequently asked questions
The short answers. See Tools for what each calculator does, or Privacy for the data policy.
What is Datum Tools?
A suite of calculators for the conversations that happen before a drawing does — what a site can hold, what the code requires, and what it costs to build. Seven tools across Build, Code and Cost: Plan, Parking, Construction Type, Egress, Fixtures, Fire Separation, and a Cost Estimator.
Is it free?
Every tool is free to try — 3 full sessions every 30 days, every tool unlocked, no restrictions and no ads while you're using one. After that, unlock everything either with a one-time purchase or a monthly subscription, whichever you'd rather do. Between sessions, tools are still visible but not usable — you can see the real inputs, just not run the calculation until the next session or the unlock.
Why do I need to sign in at all?
An account is required to use any tool. Signing in with Google, Apple, or email keeps your unlock tied to you rather than to one device.
Is this a substitute for a licensed architect or a real code review?
No. These are order-of-magnitude, preliminary tools for early conversations — not code analyses, zoning determinations, or test fits. Every number shows its assumptions and cites its IBC section where one applies, but nothing here replaces a licensed professional's sealed work.
What code does this use?
Base IBC (International Building Code), not state or local amendments — with one deliberate exception: Illinois' plumbing fixture step tables, which differ meaningfully from the IBC's own and are common enough in this practice's work to warrant a switch inside the Fixtures tool.
Does my data leave my device?
Every calculation runs locally in your browser — site areas, unit mixes, cost assumptions never reach a server. Signing in shares only your name, email, and profile photo (if your provider gives one), stored via Firebase, to identify your account and whether it's unlocked.
How accurate are the numbers?
Code-driven results (construction type, egress, fixture counts) cite the exact IBC section behind each figure. Cost figures are researched estimates with a stated vintage and confidence range, not quotes — construction costs move fast, and every rate says when it was last checked.
Can I export or share a result?
The Cost Estimator exports a one-page (or multi-page, for several buildings) PDF — site, program and cost with assumptions, not just a headline number. Built to email or drop into a deck.
Who is this for?
Architects and architecture students first, and just as useful for the developers, brokers, and loan officers on the other side of the table who need a fast, defensible order-of-magnitude answer before a design starts.
Something's wrong, or a number looks off — who do I tell?
Use the contact form on the Privacy page — every tool cites its assumptions specifically so a disagreement can point at exactly which one.