We'd love to hear from you! Whether you have questions about our calculators, suggestions for improvements, or need technical support, we're here to help.
Email: gkollias13@gmail.com
Response Time: Usually within 24 hours
Business Hours: Monday - Friday, 9 AM - 5 PM EST
Please use the contact form above with "Bug Report" selected. Include details about what you were calculating, the inputs you used, and what you expected vs. what you got.
We're always looking to improve! Select "Feature Request" in the contact form and tell us what you'd like to see added.
Our calculators use scientifically validated formulas from exercise physiology research. While individual results may vary, they provide excellent estimates for training and racing.
Yes! All our running calculators are completely free. We support the site through advertising to keep it free for all runners.
Our website is fully responsive and works great on mobile devices. We're considering a dedicated app - let us know if you'd be interested!
Are you a running coach, training platform, or fitness company? We're open to partnerships and collaborations. Contact us to discuss how we can work together to help more runners achieve their goals.