# CalcHub — Free Online Calculators (Full Index)

> Complete index of all 98 calculators and 25 blog guides on https://calc-center.party. All tools are free, run in the browser, and require no registration.

## Core Pages

- [Home](https://calc-center.party/)
- [About](https://calc-center.party/about.html)
- [Contact](https://calc-center.party/contact.html)
- [Privacy Policy](https://calc-center.party/privacy-policy.html)
- [Terms of Service](https://calc-center.party/terms-of-service.html)

## Category Pages

- [Automotive Calculators](https://calc-center.party/categories/automotive-calculators.html)
- [Business Calculators](https://calc-center.party/categories/business-calculators.html)
- [Construction Calculators](https://calc-center.party/categories/construction-calculators.html)
- [Cooking Calculators](https://calc-center.party/categories/cooking-calculators.html)
- [Education Calculators](https://calc-center.party/categories/education-calculators.html)
- [Financial Calculators](https://calc-center.party/categories/financial-calculators.html)
- [Gaming Calculators](https://calc-center.party/categories/gaming-calculators.html)
- [Health Calculators](https://calc-center.party/categories/health-calculators.html)
- [Lifestyle Calculators](https://calc-center.party/categories/lifestyle-calculators.html)
- [Real Estate Calculators](https://calc-center.party/categories/real-estate-calculators.html)
- [Science Calculators](https://calc-center.party/categories/science-calculators.html)
- [Utilities Calculators](https://calc-center.party/categories/utilities-calculators.html)

## Financial Calculators

- [Budget Calculator](https://calc-center.party/calculators/budget-calculator.html)
- [Capital Gains Tax Calculator](https://calc-center.party/calculators/capital-gains-tax-calculator.html)
- [Compound Interest Calculator](https://calc-center.party/calculators/compound-interest-calculator.html)
- [Credit Score Calculator](https://calc-center.party/calculators/credit-score-calculator.html)
- [Crypto ROI Calculator](https://calc-center.party/calculators/crypto-roi-calculator.html)
- [Currency Exchange Calculator](https://calc-center.party/calculators/currency-exchange-calculator.html)
- [Debt Payoff Calculator](https://calc-center.party/calculators/debt-payoff-calculator.html)
- [Emergency Fund Calculator](https://calc-center.party/calculators/emergency-fund-calculator.html)
- [Inflation Calculator](https://calc-center.party/calculators/inflation-calculator.html)
- [Investment Return Calculator](https://calc-center.party/calculators/investment-return-calculator.html)
- [Loan Payment Calculator](https://calc-center.party/calculators/loan-payment-calculator.html)
- [Options Profit Calculator](https://calc-center.party/calculators/options-profit-calculator.html)
- [Retirement Calculator](https://calc-center.party/calculators/retirement-calculator.html)
- [ROI Calculator](https://calc-center.party/calculators/roi-calculator.html)
- [Savings Goal Calculator](https://calc-center.party/calculators/savings-goal-calculator.html)
- [Student Loan Calculator](https://calc-center.party/calculators/student-loan-calculator.html)
- [Tax Calculator](https://calc-center.party/calculators/tax-calculator.html)

## Health Calculators

- [Blood Pressure Calculator](https://calc-center.party/calculators/blood-pressure-calculator.html)
- [BMI Calculator](https://calc-center.party/calculators/bmi-calculator.html)
- [Body Age Calculator](https://calc-center.party/calculators/body-age-calculator.html)
- [Body Fat Calculator](https://calc-center.party/calculators/body-fat-calculator.html)
- [Calorie Calculator](https://calc-center.party/calculators/calorie-calculator.html)
- [Fitness Level Calculator](https://calc-center.party/calculators/fitness-level-calculator.html)
- [Food Calorie Calculator](https://calc-center.party/calculators/food-calorie-calculator.html)
- [Heart Rate Calculator](https://calc-center.party/calculators/heart-rate-calculator.html)
- [Ideal Weight Calculator](https://calc-center.party/calculators/ideal-weight-calculator.html)
- [Macro Calculator](https://calc-center.party/calculators/macro-calculator.html)
- [Optimal Sleep Calculator](https://calc-center.party/calculators/optimal-sleep-calculator.html)
- [Pregnancy Calculator](https://calc-center.party/calculators/pregnancy-calculator.html)
- [Protein Calculator](https://calc-center.party/calculators/protein-calculator.html)
- [Running Pace Calculator](https://calc-center.party/calculators/running-pace-calculator.html)
- [Sleep Calculator](https://calc-center.party/calculators/sleep-calculator.html)
- [TDEE Calculator](https://calc-center.party/calculators/tdee-calculator.html)
- [Water Intake Calculator](https://calc-center.party/calculators/water-intake-calculator.html)

## Business Calculators

- [Break-Even Calculator](https://calc-center.party/calculators/break-even-calculator.html)
- [Employee Turnover Calculator](https://calc-center.party/calculators/employee-turnover-calculator.html)
- [Hourly to Salary Calculator](https://calc-center.party/calculators/hourly-to-salary-calculator.html)
- [Markup Calculator](https://calc-center.party/calculators/markup-calculator.html)
- [Pay Raise Calculator](https://calc-center.party/calculators/pay-raise-calculator.html)
- [Payroll Calculator](https://calc-center.party/calculators/payroll-calculator.html)
- [Profit Margin Calculator](https://calc-center.party/calculators/profit-margin-calculator.html)
- [Sales Commission Calculator](https://calc-center.party/calculators/sales-commission-calculator.html)

## Real Estate Calculators

- [Mortgage Calculator](https://calc-center.party/calculators/mortgage-calculator.html)
- [Mortgage Affordability Calculator](https://calc-center.party/calculators/mortgage-affordability-calculator.html)
- [Moving Cost Calculator](https://calc-center.party/calculators/moving-cost-calculator.html)
- [Net Worth Calculator](https://calc-center.party/calculators/net-worth-calculator.html)
- [Price per Sqft Calculator](https://calc-center.party/calculators/price-per-sqft-calculator.html)
- [Property Cash Flow Calculator](https://calc-center.party/calculators/property-cash-flow-calculator.html)
- [Property Value Calculator](https://calc-center.party/calculators/property-value-calculator.html)
- [Real Estate Commission Calculator](https://calc-center.party/calculators/real-estate-commission-calculator.html)
- [Rental Yield Calculator](https://calc-center.party/calculators/rental-yield-calculator.html)

## Education Calculators

- [College Cost Calculator](https://calc-center.party/calculators/college-cost-calculator.html)
- [Final Grade Calculator](https://calc-center.party/calculators/final-grade-calculator.html)
- [GPA Calculator](https://calc-center.party/calculators/gpa-calculator.html)
- [Reading Time Calculator](https://calc-center.party/calculators/reading-time-calculator.html)
- [Study Time Calculator](https://calc-center.party/calculators/study-time-calculator.html)

## Construction Calculators

- [Concrete Calculator](https://calc-center.party/calculators/concrete-calculator.html)
- [Fence Calculator](https://calc-center.party/calculators/fence-calculator.html)
- [Flooring Calculator](https://calc-center.party/calculators/flooring-calculator.html)
- [HVAC Calculator](https://calc-center.party/calculators/hvac-calculator.html)
- [Paint Calculator](https://calc-center.party/calculators/paint-calculator.html)
- [Roofing Calculator](https://calc-center.party/calculators/roofing-calculator.html)
- [Stair Calculator](https://calc-center.party/calculators/stair-calculator.html)

## Automotive Calculators

- [Car Depreciation Calculator](https://calc-center.party/calculators/car-depreciation-calculator.html)
- [Car Loan Calculator](https://calc-center.party/calculators/car-loan-calculator.html)
- [Engine Displacement Calculator](https://calc-center.party/calculators/engine-displacement-calculator.html)
- [Fuel Economy Calculator](https://calc-center.party/calculators/fuel-economy-calculator.html)
- [Horsepower Calculator](https://calc-center.party/calculators/horsepower-calculator.html)
- [Tire Size Calculator](https://calc-center.party/calculators/tire-size-calculator.html)

## Cooking Calculators

- [Baking Conversion Calculator](https://calc-center.party/calculators/baking-conversion-calculator.html)
- [Cooking Time Calculator](https://calc-center.party/calculators/cooking-time-calculator.html)
- [Pizza Dough Calculator](https://calc-center.party/calculators/pizza-dough-calculator.html)
- [Recipe Scaling Calculator](https://calc-center.party/calculators/recipe-scaling-calculator.html)
- [Tip Calculator](https://calc-center.party/calculators/tip-calculator.html)

## Gaming Calculators

- [FPS Calculator](https://calc-center.party/calculators/fps-calculator.html)
- [Gaming Cost Calculator](https://calc-center.party/calculators/gaming-cost-calculator.html)
- [Gaming PC Calculator](https://calc-center.party/calculators/gaming-pc-calculator.html)
- [Gaming Time Calculator](https://calc-center.party/calculators/gaming-time-calculator.html)
- [Streaming Revenue Calculator](https://calc-center.party/calculators/streaming-revenue-calculator.html)
- [XP Calculator](https://calc-center.party/calculators/xp-calculator.html)

## Science Calculators

- [Area Calculator](https://calc-center.party/calculators/area-calculator.html)
- [Date Calculator](https://calc-center.party/calculators/date-calculator.html)
- [Percentage Calculator](https://calc-center.party/calculators/percentage-calculator.html)
- [Speed-Distance-Time Calculator](https://calc-center.party/calculators/speed-distance-time-calculator.html)
- [Statistics Calculator](https://calc-center.party/calculators/statistics-calculator.html)
- [Volume Calculator](https://calc-center.party/calculators/volume-calculator.html)

## Lifestyle Calculators

- [Age Calculator](https://calc-center.party/calculators/age-calculator.html)
- [Alcohol Calculator](https://calc-center.party/calculators/alcohol-calculator.html)
- [Baby Formula Calculator](https://calc-center.party/calculators/baby-formula-calculator.html)
- [Discount Calculator](https://calc-center.party/calculators/discount-calculator.html)
- [Dog Food Calculator](https://calc-center.party/calculators/dog-food-calculator.html)
- [Wedding Budget Calculator](https://calc-center.party/calculators/wedding-budget-calculator.html)

## Utilities Calculators

- [Carbon Footprint Calculator](https://calc-center.party/calculators/carbon-footprint-calculator.html)
- [Electricity Calculator](https://calc-center.party/calculators/electricity-calculator.html)
- [Internet Speed Calculator](https://calc-center.party/calculators/internet-speed-calculator.html)
- [Solar Panel Calculator](https://calc-center.party/calculators/solar-panel-calculator.html)
- [Solar Payback Calculator](https://calc-center.party/calculators/solar-payback-calculator.html)
- [Water Usage Calculator](https://calc-center.party/calculators/water-usage-calculator.html)

## Blog Articles

- [Blog Index](https://calc-center.party/blog/)
- [Age Calculator Guide](https://calc-center.party/blog/articles/age-calculator-guide.html)
- [Best Health & Fitness Calculators 2026](https://calc-center.party/blog/articles/best-health-calculators-2026.html)
- [BMI Explained](https://calc-center.party/blog/articles/bmi-explained.html)
- [Calculators for First-Time Homebuyers](https://calc-center.party/blog/articles/calculators-for-homebuyers.html)
- [Freelancer Calculators](https://calc-center.party/blog/articles/freelancer-calculators.html)
- [Student Calculators Guide](https://calc-center.party/blog/articles/student-calculators-guide.html)
- [Top 10 Financial Calculators 2026](https://calc-center.party/blog/articles/top-10-financial-calculators-2026.html)
- [Body Fat Guide](https://calc-center.party/blog/articles/body-fat-guide.html)
- [Budgeting 50/30/20 Guide](https://calc-center.party/blog/articles/budgeting-50-30-20-guide.html)
- [Calorie Needs Guide](https://calc-center.party/blog/articles/calorie-needs-guide.html)
- [Carbon Footprint Guide](https://calc-center.party/blog/articles/carbon-footprint-guide.html)
- [Compound Interest Power](https://calc-center.party/blog/articles/compound-interest-power.html)
- [Credit Score Guide](https://calc-center.party/blog/articles/credit-score-guide.html)
- [Crypto Investing Guide](https://calc-center.party/blog/articles/crypto-investing-guide.html)
- [Debt Payoff Guide](https://calc-center.party/blog/articles/debt-payoff-guide.html)
- [GPA Calculation Guide](https://calc-center.party/blog/articles/gpa-calculation-guide.html)
- [Ideal Weight Guide](https://calc-center.party/blog/articles/ideal-weight-guide.html)
- [Inflation Guide](https://calc-center.party/blog/articles/inflation-guide.html)
- [Loan Payment Guide](https://calc-center.party/blog/articles/loan-payment-guide.html)
- [Macro Nutrition Guide](https://calc-center.party/blog/articles/macro-nutrition-guide.html)
- [Mortgage Guide](https://calc-center.party/blog/articles/mortgage-guide.html)
- [Net Worth Guide](https://calc-center.party/blog/articles/net-worth-guide.html)
- [Percentage Calculations](https://calc-center.party/blog/articles/percentage-calculations.html)
- [Real Estate Investing Guide](https://calc-center.party/blog/articles/real-estate-investing-guide.html)
- [Retirement Savings Guide](https://calc-center.party/blog/articles/retirement-savings-guide.html)
- [ROI Investment Guide](https://calc-center.party/blog/articles/roi-investment-guide.html)
- [Running Pace Guide](https://calc-center.party/blog/articles/running-pace-guide.html)
- [Sleep Guide](https://calc-center.party/blog/articles/sleep-guide.html)
- [Tipping Etiquette](https://calc-center.party/blog/articles/tipping-etiquette.html)
- [Wedding Budget Guide](https://calc-center.party/blog/articles/wedding-budget-guide.html)

## Developer API

- [Free Calculator Data API](https://calc-center.party/api/) — 8 static JSON endpoints (tax brackets, mortgage rates, BMI, heart-rate zones, TDEE, compounding, pregnancy, currencies). Free, no auth, CORS-enabled, CDN-cached.
- [API Live Explorer](https://calc-center.party/api/docs/) — interactive demo to fetch and inspect every endpoint live, plus CORS test snippets (JS + curl).
- Endpoints (all GET, application/json):
  - https://calc-center.party/api/data/tax-brackets-2026.json — US federal income tax brackets 2026 (4 filing statuses + standard deduction)
  - https://calc-center.party/api/data/mortgage-rates.json — average US mortgage rates + APR (30y, 15y, 5/1 ARM, FHA, VA, jumbo)
  - https://calc-center.party/api/data/bmi-categories.json — WHO adult BMI ranges (underweight → obese class III)
  - https://calc-center.party/api/data/heart-rate-zones.json — Karvonen training zones (recovery, fat-burn, aerobic, anaerobic, max)
  - https://calc-center.party/api/data/tdee-activity-multipliers.json — TDEE activity multipliers (sedentary 1.2 → extremely active 1.9)
  - https://calc-center.party/api/data/compound-interest-frequencies.json — compounding period n values (daily 365 → annually 1)
  - https://calc-center.party/api/data/pregnancy-trimesters.json — trimester week ranges with milestones and average weight gain
  - https://calc-center.party/api/data/currency-symbols.json — 30 major ISO 4217 currencies with symbols, decimals, region
- Each JSON has a `_meta` block: version, source, lastUpdated (ISO date).
- License: free for commercial and non-commercial use, attribution appreciated, no warranty.

## Compare Guides Wave 3 (added 2026-05-24)

- https://calc-center.party/compare/401k-vs-roth-401k.html — 401(k) vs Roth 401(k)
- https://calc-center.party/compare/lump-sum-vs-annuity.html — Lump Sum vs Annuity
- https://calc-center.party/compare/salary-vs-hourly.html — Salary vs Hourly
- https://calc-center.party/compare/condo-vs-house.html — Condo vs House
- https://calc-center.party/compare/paying-cash-vs-financing-car.html — Paying Cash vs Financing Car
- https://calc-center.party/compare/credit-card-vs-personal-loan.html — Credit Card vs Personal Loan

## Changelog

- https://calc-center.party/changelog/ — public site changelog (releases, fixes, features, schema updates)

## Compare Guides Wave 4 (added 2026-05-24)

- https://calc-center.party/compare/solar-vs-grid-electricity.html — Solar vs Grid Electricity
- https://calc-center.party/compare/iphone-vs-android-total-cost.html — iPhone vs Android Total Cost
- https://calc-center.party/compare/brick-vs-vinyl-siding-cost.html — Brick vs Vinyl Siding

## Tools Hub & FAQ

- https://calc-center.party/tools/ — single-page index of every CalcHub utility (Compare, Glossary, Search, Embed, API, Authors, Changelog, Feeds)
- https://calc-center.party/faq/ — 15 common questions about CalcHub: accuracy, privacy, embed terms, commercial use, AI training, accessibility

## Accessibility, Press, Sitemaps (Sprint 8 — 2026-05-24)

- https://calc-center.party/accessibility/ — Accessibility Statement (WCAG 2.1 AA conformance, NVDA/VoiceOver tested, dark mode, keyboard nav)
- https://calc-center.party/press/ — Press Kit (downloadable logos, project facts, boilerplate, author bios, brand colors, citation format)
- https://calc-center.party/sitemap.txt — Plain-text URL list (180+ URLs, alternate format to sitemap.xml)

## Compare Guides Wave 5 (added 2026-05-24)

- https://calc-center.party/compare/home-equity-loan-vs-heloc.html — Home Equity Loan vs HELOC
- https://calc-center.party/compare/traditional-vs-online-banking.html — Traditional vs Online Banking
- https://calc-center.party/compare/suv-vs-sedan-cost.html — SUV vs Sedan Cost

## Spreadsheet Templates (Sprint 9 — 2026-05-24)

- https://calc-center.party/templates/ — Templates hub (CollectionPage + ItemList schema)
- https://calc-center.party/templates/monthly-budget-50-30-20.csv — 50/30/20 monthly budget CSV
- https://calc-center.party/templates/mortgage-amortization-blank.csv — Mortgage amortization CSV with formulas
- https://calc-center.party/templates/daily-calorie-macro-log.csv — Daily calorie + macro log CSV with weekly summary

## Compare Guides Wave 6 + Directory (Sprint 10 — 2026-05-24)

- https://calc-center.party/compare/ — Compare directory hub (now 34 guides categorized)
- https://calc-center.party/compare/cd-vs-treasury-bills.html — CD vs Treasury Bills
- https://calc-center.party/compare/heat-pump-vs-natural-gas-furnace.html — Heat Pump vs Natural Gas Furnace
- https://calc-center.party/compare/private-vs-public-college-cost.html — Private vs Public College Cost

## Compare Guides Wave 7 (Sprint 11 — 2026-05-24)

- https://calc-center.party/compare/cash-out-refi-vs-heloc.html — Cash-Out Refinance vs HELOC
- https://calc-center.party/compare/medicare-vs-medicare-advantage.html — Original Medicare vs Medicare Advantage
- https://calc-center.party/compare/gas-stove-vs-induction-stove.html — Gas Stove vs Induction Stove

## Quick Reference (Sprint 11)

- https://calc-center.party/quick-reference/ — Printable cheat sheets: 30+ formulas, ratios, and tables (mortgage, compound interest, BMI, 2026 tax brackets, retirement limits, HVAC ratings, unit conversions, more)