Select Your Engineering Discipline
Specialized calculation hubs tailored for industry professionals.
Electrical Tools
IEC 60364 & IEEE 80 compliant calculators for Arc Flash, Cable Sizing, Short Circuit currents, and Grounding Grid design.
Explore ElectricalInstrumentation
ISA & API standard tools for Control Valves (Cv), Orifice Plates, Level Transmitters, and SIL/Reliability analysis.
Explore InstrumentationMechanical Tools
ASME & ISO calculators for Pressure Vessels, Fluid Dynamics, Heat Transfer, and Pump Sizing applications.
Explore MechanicalWhy Trust Design Calculators?
We are more than just a tool; we are your partner in precision engineering. Dedicated to empowering the community with free, transparent, and standard-compliant tools.
Guided by Standards
Our algorithms are strictly based on international standards including IEC, IEEE, ASME, API, and ISO, ensuring your results are audit-ready and professional.
Completely Free
We believe engineering safety shouldn't have a paywall. All our professional-grade tools are free to use, supported by the community and minimal ads.
Educational Value
We don't just give answers; we show the math. Detailed steps and formula explanations help you verify results and deepen your understanding.
Electrical Engineering Design Calculators
Comprehensive tools complying with IEC 60364, IEEE 80, and other global standards for safe and efficient electrical system design.
Instrumentation Engineering Calculation Tools
Precision calculators for sensing, control, and automation professionals, aligned with ISA and API standards.
Mechanical Engineering Analysis Calculators
Robust analysis tools for fluid dynamics, thermodynamics, and machine design, referencing ASME and ISO standards.
Unlock Your Solution in 3 Simple Steps
Input Your Parameters
Select your calculator and enter your project-specific data into the intuitive interface.
Get Instant Results
Our powerful engine processes your data instantly, providing the final, accurate answer.
Review Every Step
This is our unique value. Expand the detailed breakdown to see the full calculation, from formula to finish.
Guided by Global Standards
Our credibility is rooted in referencing the world's most respected engineering authorities. Our tools are inspired by the methodologies and principles recommended by respected global engineering organizations. We reference widely recognized practices to maintain consistency, reliability, and clarity in every calculation. While our resources draw from established standards, they are intended for informational and educational purposes — helping users understand and apply sound engineering concepts with confidence.
IEC
IEEE
ASME
API
ISA
Technical Papers & Blogs
Stay informed with our in-depth guides and articles. We break down complex topics to help you stay ahead in your field.
ELECTRICAL GUIDE
Understanding Electrical Safety Standards (IEC 60364)
A breakdown of core principles like protective earthing, fault protection, and insulation coordination.
MECHANICAL INSIGHTS
Key Factors in Centrifugal Pump Selection
Learn about head, flow rate, NPSH, and efficiency to choose the right pump for your application.
INSTRUMENTATION TIPS
Sizing Control Valves: A Practical Approach
Explore the importance of the flow coefficient (Cv) and how to avoid common pitfalls like flashing and cavitation.
Engineering FAQ
Common questions about our standards, accuracy, and usage.
What IEC standards are used?
Our calculators primarily reference IEC 60364 for electrical installations, IEC 60909 for short-circuit currents, and IEC 61508 for functional safety. Each calculator page cites the specific standard used for transparency.
Are results suitable for detailed engineering?
Yes, but with verification. While our tools use industry-standard formulas and factors, all results should be verified by a qualified engineer. They are excellent for reliable estimates, front-end engineering design (FEED), and quick validation.
How often are calculators updated?
We review our tools quarterly to ensure alignment with the latest standard revisions (e.g., when a new IEEE or IEC version is released). We also continuously update them based on user feedback.
Are formulas referenced?
Absolutely. We believe in "White Box" calculation. Every tool includes a "Formula & Calculation Details" section (often hidden by default) that shows the exact equations and logic used.
Can results be exported?
Currently, you can print the results page to PDF (Ctrl+P) which is formatted for reports. We are working on a direct "Export to Excel/PDF" feature for registered users.
Do you support both SI and Imperial units?
Most of our calculators are designed with global engineers in mind and offer automatic conversion or specific fields for both Metric (SI) and Imperial units.
Is my calculation data saved?
No. We prioritize your privacy. All calculations are performed client-side in your browser. We do not store your project data or input parameters on our servers.
Is registration required to use the tools?
No. All tools on Design Calculators are currently free and open for public use without any registration or login barriers.
Can I request a specific calculator?
Yes! We value community feedback. If you have a specific standard or calculation you need, please contact us via the "Contact" page, and we will consider adding it to our roadmap.
Are these tools free for commercial use?
Yes, you are free to use these tools for your commercial engineering projects. However, please read our Terms of Service regarding liability—user verification is always required.