By accessing and using CalcHub (the "Website"), accessible at https://calchubonline.com and operated by ThinkStack Labs Inc. ("CalcHub," "we," "us," or "our"), you accept and agree to be bound by these Terms of Service. If you do not agree to these terms, please refrain from using our tools and services.
CalcHub provides users with an extensive suite of specialized online calculation tools across home improvement, finance, health, fitness, education, and freelancing. Services include saving calculation history, creating named multi-calculation Projects, CSV/PDF exporting, email sharing, and optional AI-assisted summaries (the "Service"). All calculation results are provided for informational and educational purposes only and should not replace professional financial, engineering, medical, or legal advice.
Basic calculators are free to use without an account. Certain capabilities (such as saving calculation history, creating projects, or accessing pro tool features) require creating a free account.
CalcHub Pro: Paid subscriptions ($4.99/month or promotional annual plans) unlock an ad-free experience, unlimited cloud projects, priority AI summary processing, and premium export formats. Subscriptions renew automatically each billing cycle through Stripe until cancelled in your account settings.
Subscriptions can be cancelled at any time via the self-serve billing portal in your account settings. Upon cancellation, you retain Pro access through the end of your active prepaid billing period. Refund requests submitted within 14 days of initial purchase are reviewed on a case-by-case basis by contacting [email protected].
You agree not to:
Calculators featuring AI-generated summaries utilize Google's Gemini models. AI interpretations are predictive and informational. Users must independently verify all mission-critical calculations (e.g. structural load estimates, medical doses, or tax liabilities) with licensed professionals.
CalcHub and its calculation models are provided on an "AS IS" and "AS AVAILABLE" basis without warranties of any kind. While ThinkStack Labs makes every effort to ensure computational accuracy based on standard industry formulas, we do not warrant that results will be error-free or uninterrupted.
In no event shall ThinkStack Labs Inc., its directors, employees, or partners be liable for any indirect, incidental, special, consequential, or punitive damages arising from your use of or inability to use CalcHub calculators or reliance on calculated estimates.
Free tiers of CalcHub display third-party advertisements served by Google AdSense. We do not endorse or assume responsibility for any third-party products, services, or websites linked within ads or external references.
For legal inquiries or support regarding these Terms of Service, please contact:
ThinkStack Labs Inc. / CalcHub
Email: [email protected]
Official Website: https://calchubonline.com
Corporate: https://thinkstacklabs.com
Last revised: October 16, 2026