Quick Convert
Convert common mechanical and energy quantities without moving between reference tables.
1,000 CFM = 471.95 L/s
MEP software tools
Engineering calculators built for MEP engineers.
Purpose-built software for the calculations MEP engineers run every day — unit conversion, load estimates, duct sizing, and full psychrometric states. Built by a licensed PE, used on real projects.
Licensed PE — Texas #97300
ASHRAE Fundamentals correlations
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Software
Engineering Utility Suite 1.0
Six working calculators, built and used on real projects. This page is a preview — the live, interactive versions run on basisthread.com.
Air-side sensible heat
Estimate sensible capacity from airflow and dry-bulb temperature difference.
8,400 CFM × 18°F ΔT = 163,296 Btu/h (13.61 tons)
Water-side heat transfer
Estimate hydronic capacity from liquid flow, temperature difference, and fluid factor.
240 gpm × 12°F ΔT × factor 500 = 1,440,000 Btu/h (120.00 tons)
Air changes per hour
Check the theoretical room air-change rate from supply or exhaust airflow and room volume.
1,200 CFM in 6,000 ft³ = 12.00 ACH
Rectangular duct velocity
Calculate face area and average air velocity for a rectangular duct.
24 in × 18 in, 4,000 CFM = 3.000 ft², 1,333 FPM
Psychrometric state
Full moist-air state from dry bulb plus wet bulb, relative humidity, dew point, or humidity ratio — with IP/SI units and a live psychrometric chart.
75.0°F db, 62.5°F wb → 55.1°F dp, 49.8% rh
Use with judgment
Transparent by design.
These tools are intended for reference and preliminary checks. They do not replace applicable codes, project criteria, manufacturer data, or professional engineering judgment.
No uploaded data
On basisthread.com, calculations run in the browser — nothing entered into these utilities is transmitted or stored.
Assumptions shown
Each utility shows the relationship and key limitations beside the inputs instead of hiding them.
Results you can copy
Copy a concise calculation record, then verify it against the governing project information.
About
Built by a working MEP engineer.
Dickson Engineering, LLC is a licensed Professional Engineering practice that builds and maintains software tools for other MEP engineers. Every calculator is written, checked, and maintained by the same PE who uses them on real projects.
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