Building-science tools

Tools & Calculators

Free, no-sign-up building-science tools to help you understand and improve your indoor environment.

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Healthy Build · New Build & Reno

Healthy Build Readiness Scorecard

Rate your build across the eight systems that decide a home’s health, then get a personal, hold-nothing-back guide on what to focus on and how to succeed in each. About four minutes.

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Healthy Build · Site Selection

Healthy Build Site Assessment

Read a lot, an acreage, or an existing home against a healthy-home vision — its spirit, its features, and the hazards nearby — and get a printable report to carry into the purchase decision, while the choice is still open. About five minutes.

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Mould · Indoor Air

MSQPCR Mould Test Interpreter

Enter your ERMI / HERTSMI-2 lab numbers and get a clear, colour-coded reading — scores, per-species elevation, and what the moisture and substrate patterns imply. Compare multiple rooms side by side.

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Ventilation · Filtration

Ventilation & Filtration Calculator

Estimate the fresh-air ventilation needed to hold a CO₂ target, then the added filtration (CADR) to reach a 4–6 ACHe clean-air target for particles, wildfire smoke, and dust.

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Moisture · Condensation

Dew Point & Condensation Risk

Find your indoor dew point from temperature and humidity, then check whether your coldest surfaces are at risk of condensation — the earliest signal of hidden moisture and mould.

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More tools coming
New calculators are added here regularly.