About Smart Web Tools Calculators
A free, modern library of online calculators built to help everyday people make smarter decisions with their money, health, and time.
Our Mission
Smart Web Tools Calculators was created with a simple belief: everyone deserves access to accurate, easy-to-use financial and everyday calculators without paywalls, sign-ups, or data collection.
We noticed that many existing calculator sites were cluttered with ads, required accounts to access basic tools, or were built on outdated technology that didn't work well on mobile devices. We set out to build something better.
What We Build
Our calculator library covers a wide range of everyday needs:
- Finance & Money — Compound interest, savings goals, retirement planning, debt payoff
- Loans & Mortgages — Payment calculators, amortization schedules, refinance analysis
- Business Tools — Profit margins, markup pricing, commission, salary conversions
- Health & Fitness — BMI, BMR, calorie needs, water intake, body fat estimation
- Math & Everyday — Percentages, fractions, averages, scientific calculations
- Unit Conversions — Length, weight, temperature, volume, speed, and more
- Home & Construction — Square footage, paint, concrete, mulch calculations
- Cooking — Recipe conversions, ingredient weights, oven temperatures
- Marketplace Fees — eBay, PayPal, Stripe, Venmo fee calculators
Our Principles
Privacy First
All calculations happen in your browser. We never collect, store, or sell your inputs.
Accuracy Matters
We use standard formulas and test all calculators thoroughly before publishing.
Educate, Don't Just Calculate
Every tool includes formulas, examples, and explanations so you understand the results.
Part of the SmartWTS Family
Smart Web Tools Calculators (calc.smartwts.com) is part of SmartWTS — a collection of practical web tools designed to help individuals, freelancers, and small businesses work smarter. Visit smartwts.com to explore our full suite of tools.
Disclaimer
The calculators on this site are provided for informational and educational purposes only. Results are estimates based on standard formulas. They should not be considered financial, medical, legal, or professional advice. Always consult a qualified professional for important decisions. See our full Disclaimer.
Get in Touch
We'd love to hear from you — whether you're reporting a bug, suggesting a new calculator, or just saying hello. Visit our Contact page to reach out.