Free online calculators & tools that just work
37 fast, no-signup tools for finance, health, study, and everyday life — with a privacy-first promise: your numbers stay in your browser.
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Privacy-first
Calculators run in your browser. Your inputs and files never get uploaded.
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Instant & free
No signup, no paywall, no downloads. Results update live as you type.
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Clear methodology
Every tool explains the formula it uses, so you can trust the result.
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Popular tools
Mortgage Calculator
Estimate your monthly home payment
Calorie (TDEE) Calculator
Your daily calories to lose, keep or gain
Loan Calculator
Monthly payment, total interest & amortization
Tip Calculator
Tip and split the bill in seconds
GPA Calculator
Weighted & unweighted grade point average
BMI Calculator
Body Mass Index & healthy weight range
Age Calculator
Your exact age in years, months & days
Take-Home Pay Calculator
See your real paycheck after tax
Browse by category
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Finance
Loans, mortgages & debt
5 tools
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Real Estate
Buy, rent & invest
2 tools
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Tax
Income, paycheck & sales tax
2 tools
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Business
Margins, invoicing & ROI
4 tools
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Health & Fitness
Calories, BMI & macros
4 tools
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Education
Grades & study tools
2 tools
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Crypto
Profit, DCA & conversions
1 tools
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Image Tools
Compress, resize & convert
1 tools
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PDF Tools
Merge, split & convert PDFs
6 tools
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QR Codes
Generate & scan QR codes
2 tools
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Everyday
Tip, age, converters & more
8 tools
All 37 tools
Loan Calculator
Monthly payment, total interest & amortization
Mortgage Calculator
Estimate your monthly home payment
Rent vs Buy Calculator
Find the smarter move for your money
Take-Home Pay Calculator
See your real paycheck after tax
Profit Margin Calculator
Markup, margin & profit in one place
Calorie (TDEE) Calculator
Your daily calories to lose, keep or gain
BMI Calculator
Body Mass Index & healthy weight range
GPA Calculator
Weighted & unweighted grade point average
Crypto Profit Calculator
Profit, loss & ROI on any trade
Image Compressor
Shrink JPG & PNG in your browser
Percentage Calculator
Every percentage question, solved
Compound Interest Calculator
Watch your savings grow over time
Credit Card Payoff Calculator
How long to clear your balance
Home Affordability Calculator
How much house can you afford?
Sales Tax Calculator
Add or remove sales tax instantly
Macro Calculator
Daily protein, carbs & fat targets
Final Grade Calculator
What you need on the final exam
Tip Calculator
Tip and split the bill in seconds
Age Calculator
Your exact age in years, months & days
Unit Converter
Length, weight & temperature
Password Generator
Strong, random passwords in your browser
Word Counter
Words, characters & reading time
Discount Calculator
Sale price and how much you save
Auto Loan Calculator
Car payment with tax, trade-in & down
Due Date Calculator
Estimate your baby's due date
Hours Calculator
Time between two times, minus breaks
Merge PDF
Combine PDFs into one file
Split PDF
Extract pages from a PDF
Images to PDF
Turn JPG & PNG into a PDF
Edit PDF
Edit text, add text & white-out
Organize PDF
Rotate, delete & reorder pages
Compress PDF
Reduce PDF file size
QR Code Generator
Make a QR code for any link or text
QR Code Reader
Scan & decode a QR code
JSON Formatter
Format, validate & minify JSON
Resume Builder
Build, match to a job & download a PDF
Invoice Generator
Create & download a professional invoice PDF