About ToolHub Pro
ToolHub Pro is a free calculator site. No sign-ups, no paywalls, no data collection. Every calculation runs in your browser and nothing you type is ever sent to a server.
The site has 59 tools across seven categories: finance, health, home, marketing, security, unit converters, and time and date. Each tool uses formulas from primary sources and is reviewed for accuracy before going live.
Our Editorial Team
Hafeez Alli-owe
QA Engineer & Founder, ToolHub Pro
Hafeez is a QA engineer who built ToolHub Pro to provide accurate, free calculators for finance, health, home, and more. Every formula is sourced from authoritative primary references — CFA Institute guidelines, IRS publications, Federal Reserve data, CDC and WHO standards, and NIST publications for security tools. Each source is linked directly on the tool page so you can verify the methodology yourself.
Health tools are reviewed against CDC, WHO, and NIH guidelines. Security tools are verified against NIST SP 800-63B and FIPS standards. Marketing and home tools cite SBA, HBR, CFPB, and HUD publications.
Methodology
Every calculator uses formulas from primary sources: IRS publications for tax, CFA Institute guidelines for investment tools, CDC and WHO standards for health, and NIST publications for cryptographic tools. We link to these sources on each tool page so you can check the math yourself.
Where multiple formulas exist (for example, Mifflin-St Jeor vs Harris-Benedict for BMR), we use the one with the strongest evidence and explain why on the tool page.
What We Cover
- Finance — compound interest, freelance rates, debt payoff, ROI, emergency funds, and more
- Health & Fitness — BMI, TDEE, macros, running pace, heart rate zones, sleep cycles
- Home Ownership — mortgage payments, rent vs buy, solar payback, renovation budgets
- Marketing — CPM, CLV, churn, conversion rate, email ROI, break-even analysis
- Security — password strength, hash generation, JWT decoding, CIDR subnets, HMAC signing
- Unit Converters — temperature, length, weight, volume, speed, data storage, area
- Time & Date — days between dates, business days, timezone conversion, age calculator
Privacy by Design
All calculations run entirely in your browser using JavaScript. No input data — not your income, your password, your health metrics, or anything else — is ever transmitted to our servers. We use Google Analytics for aggregate traffic data (with your consent) and Google AdSense to keep the site free. See our Privacy Policy for full details on what is and is not collected.
Advertising
ToolHub Pro displays Google AdSense advertisements to support the free service. Ad units are clearly labelled “Advertisement” and are visually separated from calculator tools and editorial content. Ads appear alongside and below calculator interfaces — never inside input areas or result displays. We comply with Google AdSense Programme Policies and the Coalition for Better Ads Standards.
Disclaimer
ToolHub Pro provides tools for informational and educational purposes only. Results are estimates based on the inputs you provide and the formulas used. They should not be treated as financial, legal, medical, or tax advice. Consult a licensed professional before making significant decisions based on any calculator output.