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Free online tools

Free Online Tools That Help You Make Faster Everyday Decisions

Use practical calculators, converters, generators, and guides for home buying, personal finance, school, health, productivity, and more. Everything runs free in your browser, with no sign-up required.

87 free tools 10 categories Browser-based No sign-up
Browse all categories Explore popular calculators

Start with your situation

Pick the lane that matches what you are trying to figure out, then jump straight into the most useful tools for that workflow.

For Home Buyers

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Estimate a realistic payment, check affordability, and compare buying options before you talk to a lender.

Mortgage Calculator Home Affordability Calculator APR Calculator Rent vs Buy Calculator

Helpful guides

How to Estimate a Monthly Mortgage Payment Before You Talk to a Lender How Much House Can You Afford Based on Income and Debt?

For Personal Finance

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Work through take-home pay, taxes, long-term growth, and retirement planning with practical calculators.

Paycheck Calculator Tax Calculator Compound Interest Calculator Retirement Calculator

Helpful guides

How to Estimate Take-Home Pay from Salary or Hourly Wages How to Estimate Your Taxes Before Filing Season How Small Monthly Contributions Can Compound Over Time

For Students

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Handle grades, citations, and quick academic planning without bouncing between separate tools.

GPA Calculator Grade Calculator Citation Generator Word Counter

For Health

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Use wellness calculators for calorie planning, BMI checks, and fitness-related what-if scenarios.

BMI Calculator Calorie Calculator TDEE Calculator Calorie Deficit Calculator

For Productivity

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Plan schedules, count content, and manage workday timing with simple browser-based utilities.

Date Calculator Time Calculator Work Hours Calculator Character Counter

Popular free online tools

Start with the most-used free calculators, PDF tools, converters, and productivity utilities on SmartToolsHub.

real-estate

Mortgage Calculator

Estimate a realistic monthly mortgage payment using home price, down payment, APR, taxes, insurance, HOA, PMI, and extra-payment assumptions.

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real-estate

Home Affordability Calculator

Estimate how much house you can afford using income, debt, down payment, taxes, insurance, HOA, PMI, closing costs, and DTI targets.

home affordability calculatorhow much house can i affordhouse affordability by income
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finance

APR Calculator

Estimate annual percentage rate using loan amount, nominal interest rate, term, and upfront fees so you can compare the effective borrowing cost more accurately.

apr calculatorapr vs interest rateeffective borrowing cost
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finance

Tax Calculator

Estimate federal income tax, state income tax, and employee payroll taxes for tax year 2025 with filing-status support, itemized deductions, and either a federal-taxable or custom state tax base.

tax calculatorfederal taxstate income tax
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finance

Retirement Calculator

Project retirement savings growth using current balance, monthly contributions, income-replacement targets, inflation, contribution increases, and a planning withdrawal rate.

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technology

PDF Compressor

Compress PDF files in the browser with scale and quality controls, before-and-after size comparison, and instant download.

pdf compressorcompress pdf onlinereduce pdf size
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technology

Internet Speed Test

Test internet download speed, upload speed, ping, and jitter with same-origin server checks, selectable sample profiles, and shareable settings.

internet speed testwifi speed testdownload speed test
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real-estate

Rent vs Buy Calculator

Compare renting and buying with mortgage costs, taxes, insurance, HOA, maintenance, PMI, appreciation, selling costs, rent growth, and investment return assumptions.

rent vs buybuy or renthome buying calculator
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finance

Compound Interest Calculator

Project future investment growth with starting principal, recurring monthly contributions, contribution growth, compounding frequency, inflation, and optional target tracking.

compound interestinvestment growthfuture value
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technology

CIDR Calculator

Calculate IPv4 CIDR subnet details from an IP address and prefix length, including network address, broadcast address, subnet mask, host range, usable hosts, and address classification.

cidr calculatorsubnet calculatoripv4 network
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technology

JSON Formatter & Validator

Validate, format, and minify JSON with optional key sorting, output metrics, and one-click copy or download.

json formatterjson validatorjson beautifier
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technology

Base64 Encoder & Decoder

Encode plain text to Base64 or decode Base64 back to text with optional URL-safe output and padding controls.

base64 encoderbase64 decoderurl safe base64
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productivity

Text Case Converter

Convert text across sentence, title, uppercase, lowercase, snake_case, kebab-case, camelCase, and PascalCase styles.

text case convertertitle case convertersnake case converter
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education

Citation Generator

Generate in-text or reference-list citations for websites, books, and journal articles with selectable APA 6, APA 7, MLA, and Chicago styles.

citation generatorapa citationmla citation
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Recent tools

Open a tool in the interactive app and it appears here for quick return visits.

Favorite tools

Save high-repeat tools from any tool page to keep them pinned on the home page.

Browse free tool categories

Explore the full catalog by topic and use the category pages to discover related tools with stronger internal linking.