Have a question about our calculators? Found an error or inconsistency? Want to suggest a new tool? We'd love to hear from you. Our team reads every message and responds to technical queries, bug reports, and feature requests as quickly as possible.
If you encounter an incorrect calculation, unexpected error message, or tool malfunction, please report it immediately. In your message, include:
We take accuracy seriously and investigate all error reports within 24 hours. If an error is confirmed, we fix it immediately and notify everyone who reported the issue.
We're happy to answer questions about concrete mix design procedures, IS 10262:2019 vs ACI 211.1 differences, material selection, water-cement ratio calculations, and admixture dosing. Please note:
For project-specific engineering advice requiring liability, please consult a licensed structural engineer in your jurisdiction.
We actively develop new calculators and features based on user demand. Popular requests that we've already implemented include:
If you have a calculation you perform frequently or a tool you wish existed, let us know. We prioritize features that benefit the largest number of users.
If you're having trouble using a calculator, understanding its output, or accessing a feature, we can help guide you through it. Common support requests include:
We welcome collaboration with universities, research institutions, and educational programs. If you're:
Please reach out — we're happy to discuss how MixDesignCalc.com can support your educational or research goals. We can provide detailed methodology documentation, custom calculator versions for specific research needs, or guest lectures on mix design for engineering courses.
To set clear expectations, here are types of requests we generally cannot fulfill:
We do not provide stamped engineering calculations, structural approvals, or project-specific mix designs that carry legal liability. MixDesignCalc.com is an educational resource and calculation tool — not a replacement for hiring a qualified structural engineer for your project.
For residential construction, commercial buildings, bridges, dams, or any project requiring engineering approval, always engage a licensed professional engineer in your region who can visit the site, review your specific requirements, and provide certified calculations.
We do not operate a material testing laboratory and cannot test your cement, aggregates, or concrete samples. For material characterization, cube testing, sieve analysis, or quality control testing, contact an accredited civil engineering laboratory in your area. Many universities and private testing firms offer these services.
We cannot provide expert testimony, forensic analysis, or opinions for construction disputes, litigation, or insurance claims. If you're involved in a dispute regarding concrete quality, structural failure, or contractor performance, engage a forensic engineer or consulting firm specializing in construction litigation support.
We do not perform comparative analyses of proprietary cement brands, ready-mix suppliers, or admixture products. Our tools and guides are brand-neutral. For information about specific commercial products, contact the manufacturers directly.
Before contacting us, check our Concrete FAQ page — it answers the most common questions we receive about mix design, concrete strength, curing, material selection, and calculator usage. You might find your answer immediately without waiting for a response.
For general concrete technology discussions, peer review of mix designs, or connecting with other engineers, consider:
If you're a web developer and found a technical bug in our website code (not a calculation error, but a JavaScript error, broken link, CSS issue, or accessibility problem), you can report it via our contact form with the label "Technical bug report" in the subject. Include console error messages if available.
All information you submit through our contact form is handled in accordance with our Privacy Policy. In summary:
Business Hours: Monday to Friday, 9:00 AM to 6:00 PM Indian Standard Time (IST)
Holidays: We observe major Indian national holidays (Republic Day, Independence Day, Diwali, Holi, etc.) and may have reduced response times during these periods.
Weekend Support: We do not provide support on Saturdays and Sundays except for critical calculator errors affecting many users. Messages received on weekends will be answered on the following Monday.
All support is provided in English. While our team members speak Hindi, Urdu, and Arabic, our official support language is English to ensure clarity and consistency in technical discussions. If English is not your first language, please don't worry about perfect grammar — we'll understand your message and help you regardless.
Stay updated on new calculators, code changes, and feature releases:
Thank you for reaching out. Whether you're reporting a bug, asking a question, or just saying hello, we appreciate every message. Your feedback helps us improve MixDesignCalc.com for the entire global engineering community.
We look forward to hearing from you!
To help us respond to your inquiry more quickly and accurately, please:
Instead of "Your calculator is wrong," provide: "The M25 mix design calculator shows 345 kg cement per m³, but IS 10262:2019 Table 5 suggests 340 kg for 20mm aggregate. Can you clarify?" Specific details help us diagnose and respond faster.
Tell us: What grade of concrete? Which country/region? What materials do you have available? What code are you following? This context helps us provide regionally appropriate guidance.
If you have multiple unrelated questions (e.g., one about steel weight calculation and another about concrete curing), send separate messages. This helps us route your query to the right team member and ensures nothing gets overlooked.
Browse our blog, FAQ page, and calculator help text before emailing. Many common questions are already answered in detail on the website, and you'll get your answer immediately rather than waiting for a reply.
We especially value feedback that helps make MixDesignCalc.com better for everyone:
Your voice matters. Every calculator we've built, every feature we've added, and every bug we've fixed started with a message from a user like you. Thank you for taking the time to reach out — we read every word and genuinely appreciate your input.
Be specific, include context, check our FAQ first. We respond faster when we have all relevant details upfront.
Thank you for contacting us. We value every message and use your feedback to improve MixDesignCalc.com for engineers worldwide.