Advanced Engineering Unit Converter
Convert compatible engineering quantities across SI, metric, Imperial and US customary units.
Open resource →5,000 engineering tools, calculators, converters & professional guides.
Browse 5,000 PROFENG resources across engineering and professional categories, with fast search, focused category hubs and direct access to practical calculators, converters, utilities and guides.
PROFENG · Professional Engineering Network · 5000 resources
Engineering Calculators, Converters & Professional Tools.
Explore engineering calculators, unit and measurement converters, thermodynamics, fluid flow, electrical, mechanical, structural, HVAC, process and instrumentation tools, alongside finance, business, developer and professional decision resources.
✓ Free to use✓ No account required✓ Mobile friendly✓ Clear assumptions
Browse by category
Start with the type of problem you need to solve.
Browse a category to explore related resources together, or use search when you already know the task, formula or topic you need.
503 resourcesPDF
Engineering
Engineering calculators, formulas and unit conversions
Browse category →460 resourcesFinance
Loans, valuation and cash flow
Browse category →363 resourcesTax
Business tax planning and documentation
Browse category →469 resourcesInsurance
Commercial risk and coverage
Browse category →532 resourcesSoftware & AI
Software cost and AI planning
Browse category →432 resourcesCybersecurity
Security architecture and vendor checks
Browse category →379 resourcesLegal
Business legal checklists
Browse category →364 resourcesReal Estate
Property underwriting and returns
Browse category →40 resourcesMarketing
Attribution, ads and growth
Browse category →528 resourcesBusiness
Operations, SaaS and unit economics
Browse category →337 resourcesE-commerce
Payments, fulfillment and merchant operations
Browse category →173 resourcesBuilding
Construction and engineering quantities
Browse category →15 resourcesPDF creation and document workflows
Browse category →5 resourcesConverters
File and format conversion
Browse category →2 resourcesImages
Image compression and photo utilities
Browse category →4 resourcesCalculators
Everyday quick calculations
Browse category →3 resourcesText
Writing and text cleanup
Browse category →388 resourcesDeveloper
Data, SQL, API and cloud utilities
Browse category →2 resourcesUtilities
Useful browser utilities
Browse category →1 resourcesEveryday
Simple everyday helpers
Browse category →39 shown
PROFENG Toolbox
Featured resources
Search by task, formula, topic or tool name across the complete PROFENG resource library.
Engineering starting points
Start with repeatable engineering calculations.
Start with the active engineering calculation waves, then move into source-linked worked examples and discipline hubs.
Darcy-Weisbach Pressure Drop Calculator
Screen major pipe pressure loss with explicit Darcy friction-factor assumptions.
Open resource →Pump Shaft Power Calculator
Relate flow, head, density and pump efficiency to required shaft power.
Open resource →Heat Exchanger Area Calculator
Screen heat-exchanger area from duty, U-value and LMTD.
Open resource →Shaft Angle of Twist Calculator
Screen circular-shaft torsional rotation from torque, length, stiffness and geometry.
Open resource →Humidity Ratio Calculator
Calculate moist-air humidity ratio using the displayed psychrometric relationship.
Open resource →ENGINEERING NEWS · DATA · TECHNOLOGY · RESEARCH
LATEST ENGINEERING DEVELOPMENTS
Follow the newest engineering advances through permanent PROFENG briefs with original engineering commentary, primary-source references, source attribution and rights notices.
AI EngineeringFrontier AI systems, infrastructure, agents and engineering applications.Latest developments →Robotics & AutomationRobotics, autonomous systems, control and industrial automation.Latest developments →Aerospace & SpaceAircraft, propulsion, spacecraft, aerodynamics and space systems.Latest developments →Civil & InfrastructureStructures, transport, smart cities, water and resilient infrastructure.Latest developments →Mechanical EngineeringMachines, thermal systems, mechanics, advanced design and manufacturing.Latest developments →Electrical & PowerPower systems, grids, electronics, electrification and high-power hardware.Latest developments →Chemical & ProcessProcess engineering, chemicals, hydrogen, pharma and industrial safety.Latest developments →Manufacturing & IndustrialFactories, digital twins, industrial AI, automation and traceability.Latest developments →Semiconductors & ElectronicsChips, photonics, advanced packaging, quantum and electronic hardware.Latest developments →Energy & Climate TechGrid modernization, batteries, efficiency and energy technology.Latest developments →Biomedical EngineeringMedical devices, bioengineering, sensing, therapeutics and lab automation.Latest developments →Software & ComputingDistributed systems, supercomputing, storage, networking and developer infrastructure.Latest developments →Cybersecurity & SystemsHardware security, cyber resilience, industrial control and critical systems.Latest developments →Materials & Advanced TechAdvanced materials, composites, batteries and AI-assisted materials discovery.Latest developments →
Browse all engineering developments →Organized by real tasks
One toolbox, organized around real work.
Instead of hiding hundreds of unrelated utilities in a flat directory, Toolbox groups resources into focused category hubs. That makes it easier to move from a broad problem to a specific calculator, converter, checklist or technical utility.
Engineering calculators & converters
Fluid flow, piping, thermodynamics, heat transfer, electrical, mechanical, structural, HVAC, process, instrumentation and engineering unit conversion.
Explore engineering tools →Browse all unit converters →
Finance & business calculators
Model loans, recurring revenue, valuation, working capital, SaaS metrics, e-commerce fees and operating costs with focused calculators.
Explore finance tools →Developer & data utilities
Format SQL, transform JSON and CSV, inspect timestamps, calculate cloud costs and handle common API or networking tasks.
Explore developer tools →Construction & building tools
Estimate concrete, rebar, roofing, insulation and common project quantities from practical building inputs.
Explore building tools →PDF & document workflows
Compress, merge, split, convert, sign and prepare common documents using practical browser-first workflows where possible.
Explore PDF tools →Engineering news & technical analysis
Follow source-linked developments across AI, automation, mechanical, civil, electrical, process, energy, computing and advanced materials.
Explore engineering news →About the free online tools
Are the PROFENG Toolbox tools free?
Yes. The Toolbox is designed around free browser utilities, calculators and practical guides. Individual tools explain any external service or limitation that applies.
Do I need an account to use the tools?
No account is required for the core Toolbox experience. Open a tool, enter the required information and use the result directly.
Which tools run in my browser?
Many calculators, text utilities, developer tools and file transformations run locally in the browser where practical. Each tool explains important processing or privacy limitations.
What kinds of tools are included?
The public growth focus is engineering: unit conversion, fluids and piping, heat transfer, mechanical design and HVAC, with additional retained utilities available through the full directory.
Designed differently
Fast tools with clear results and limitations.
Where practical, calculations, file transformations and generators run locally on your device. Guides add structured checklists, comparison criteria and primary-source links where useful, with limitations stated clearly before you rely on a result.