About Utility Pages

Our story

Utility Pages started in early 2026 as a frustration project. The free online calculator landscape was — and largely still is — dominated by a handful of sites that load slowly, cover their content with intrusive popups, ask you to sign up before showing the answer, or simply provide answers that haven't been updated in years. We wanted a single place that did the basics well: fast, accurate, mobile-friendly, and respectful of your attention.

Today the site hosts close to a hundred calculators across finance, health and fitness, construction, math and reference, developer tools, and design tools — plus thousands of location-specific resources for paycheck math, salary research, and cost-of-living comparisons across all 50 US states and the most-searched US cities. Every tool is designed to load in under a second, work without an account, and operate entirely in your browser when the math doesn't require server-side data.

Our mission

Most everyday financial, health, and reference questions have a clean numerical answer if you can put the right inputs into the right formula. The problem is finding the right formula, trusting the source, and getting the answer in less time than it takes to read an email. Our mission is to be the place you go when you need a number — and to be right, fast, and free when you get there.

Concretely, that breaks down into commitments we hold ourselves to on every tool:

• Accuracy first.Every calculator uses peer-reviewed or industry-standard formulas (Mifflin-St Jeor for TDEE, Naegele's rule for pregnancy due dates, the standard amortization equation for loans, current IRS brackets for tax math, etc.). When we make assumptions, we document them in the page and disclose limitations.
• Sources you can verify. Where we use third-party data — BLS national salary medians, BEA Regional Price Parities for cost of living, IRS revenue procedures for tax brackets, state revenue departments for state-level rates — we cite the source publicly on our methodology page.
• Privacy by design.Calculations run client-side in your browser whenever possible. Your salary, weight, dates, passwords, JSON payloads, and other inputs never reach our servers. You can verify by opening your browser's network tab while using any tool. The few cases where data leaves the browser (loading public datasets like university lists or city tax rates) involve no personal information.
• No dark patterns.No popups blocking the calculator until you subscribe. No fake countdown timers. No artificial “basic vs pro” gates on features that should just work. No manipulative confirmshaming on closing tabs. If a tool is on the site, it works.
• Honest monetization.We support the site through display ads and (in the future) a small set of carefully chosen affiliate links for products we'd recommend regardless. We will never accept paid placements that compromise the neutrality of recommendations or take sponsorship money to inflate results in any calculator.

What you'll find here

We organize calculators into seven major categories:

• Finance. Mortgage, paycheck, salary, loan, investment, compound interest, ROI, net worth, after-tax, sales tax, income tax, inflation, tip, discount, and dozens of variants. State-specific paycheck calculators for all 50 US states + DC. Salary lookups by job and location for 70 common occupations across 100 major US cities and all 51 states.
• Health and fitness. TDEE, BMI, body fat percentage, calorie needs, macro split, water intake, sleep cycle wake-time planner, pregnancy due date, ovulation, ideal weight (Devine, Robinson, Miller, Hamwi formulas), heart rate training zones, running pace and split predictor, BAC estimator (educational only).
• Construction and home improvement. Concrete by shape, square footage, paint coverage, drywall sheets, tile, mulch, roof pitch.
• Math and reference. Percentage (three modes), unit converter (six categories), volume of 3D shapes, triangle solver (Pythagorean / SSS / SAS), fraction arithmetic, Roman numeral converter, descriptive statistics, number to words.
• Developer tools. JSON formatter and validator, regex tester, hash generator (SHA-256/384/512, SHA-1, MD5), Base64 encoder/decoder, URL encoder, JWT decoder, password generator (cryptographically secure), UUID generator (v4 and v7), Lorem Ipsum, diff checker, slug generator, Markdown to HTML, Px to REM converter, AI token counter, CSV to JSON converter, HTML entity encoder, cron expression builder, CSS Flexbox generator.
• Design tools. HEX/RGB/HSL converter with WCAG contrast, color palette generator, favicon generator, QR code generator, image compressor, image format converter (PNG/JPG/WebP/AVIF), image resizer, CSS gradient generator, CSS box shadow generator.
• Time and date, productivity, writing. Age calculator, date math, time zone converter (26+ cities), time card calculator with overtime, Pomodoro timer, online stopwatch with laps, word counter with reading time, character counter for social platforms, title case converter (APA/Chicago/AP), text manipulation (sort/dedup/shuffle), and others.

Editorial standards

Calculator output is only as good as the formula and the data behind it. We hold ourselves to four standards:

• Cite the standard.If a formula has a name (Mifflin-St Jeor, Naegele's rule, Heron's formula, Pythagorean theorem), we name it on the page so you can look it up independently.
• Cite the data. If the calculator depends on regularly-updated data — tax brackets, salary medians, cost-of-living indexes — we name the source agency or publication on the methodology page and note the most recent year.
• Disclose limitations.Every calculator's page includes the assumptions and edge cases it doesn't handle. Tax calculators don't model AMT, EITC, or state-specific credits. Salary medians are population estimates, not personal targets. Health calculators are educational, not diagnostic. We say so on every relevant page.
• Update on schedule.Tax brackets refresh annually after IRS publication (typically December). FICA wage bases follow SSA's announcement (typically October). Salary data refreshes when BLS publishes new OEWS figures. Cost-of-living indexes refresh with BEA's annual RPP publication.

Who runs Utility Pages

Utility Pages is operated as an independent site by a small team based in the Americas with backgrounds in software engineering, web infrastructure, and personal finance research. We don't take outside investment, accept editorial sponsorships, or white-label the site. Hosting, domain, and operations are funded by display advertising and a long-term commitment to keep the core tools free.

For specific questions about who built a particular calculator, methodology decisions, or partnership inquiries, see the contact page.

Quality assurance

Each calculator goes through three checks before it's published and again whenever underlying data is updated:

1. Formula verification. The math is implemented from a primary source (textbook, government publication, peer-reviewed paper) and the implementation is spot-checked against published worked examples.
2. Edge-case testing. We test inputs at boundaries — zero, negative, extremely large, fractional, and unusual combinations — and either handle them gracefully or reject them with a clear message rather than producing nonsense.
3. Cross-reference against other tools.Where comparable calculators exist (e.g., Calculator.net, IRS's own withholding estimator, BLS published tables), we sanity-check our outputs against theirs and investigate any meaningful divergence.

What we won't do

• We won't require an account, email, or paywall to access any calculator on the site. The free tier is the only tier.
• We won't accept content from third parties as “sponsored articles” presented as editorial.
• We won't fingerprint, track across sites, or sell user data. Display ads are served by Google AdSense, which has its own data-handling policies (linked from our privacy policy).
• We won't replace working free tools with paid versions. If we ever offer premium features, the existing free tools stay free.

Help us improve

If you spot a bug, find a calculator giving a result you don't trust, or want a tool we don't have yet, please tell us. Email feedback comes back to a real human; we read every message and reply within a few business days. The contact page has the address.

For questions about how we calculate specific numbers, see our methodology and data sources page.

Disclaimer

All tools on Utility Pages provide educational estimates only and are not professional advice. Tax calculators are not tax advice; health calculators are not medical advice; finance and mortgage calculators are not financial advice; legal calculators (BAC) are not legal advice. For decisions affecting your money, body, family, or legal situation, consult a licensed professional in the relevant field.

Last updated

This About page was last reviewed and updated in April 2026. Significant changes to editorial standards, ownership, or business model will be reflected here.