Free Online Tools & Calculators
69+ tools — all free, all private, all instant
🔒 No data collected ⚡ Instant results 📱 Mobile friendly 🆓 100% free
💰 Finance & Money 20 tools
Mortgage Calculator
Monthly payments, amortization, total interest
Refinance Calculator
Should you refinance? Breakeven analysis
Rent vs Buy
Compare true cost of renting vs buying
Loan Payoff
How extra payments crush debt faster
Compound Interest
Watch your money grow over time
Savings Goal
Monthly amount needed for any goal
Tax Refund
Estimate your federal tax refund
Social Security
Estimate your SS benefits by claiming age
Salary Comparison
Am I underpaid? See your percentile
Net Worth Percentile
Where you rank vs Americans your age
Financial Health Score
10-question quiz with personalized score
Bill Split
Split the check with tip calculation
Unit Price
Which product is the better deal?
Discount Calculator
Calculate sale prices and stacked discounts
Budget Calculator
50/30/20 budget breakdown
Wedding Budget
Allocate your wedding budget by category
Annuity Calculator
Fixed, variable, and indexed annuity payouts
Options Profit
P&L scenarios for options trades
Stock Average
Dollar cost average calculator with P/L
Inflation Calculator
What is money worth over time?
💪 Health & Fitness 10 tools
BMI Calculator
Body mass index with health ranges
Body Fat Calculator
US Navy method body fat estimate
Calorie Deficit
How many calories to lose weight
Macro Calculator
Daily protein, carb, and fat targets
Sleep Calculator
Optimal bedtime based on sleep cycles
Water Intake
Daily water recommendation by weight
Pace Calculator
Running pace, splits, and race times
Due Date Calculator
Pregnancy due date with milestone timeline
Dog Age Calculator
Dog years to human years (size-adjusted)
Age Calculator
Exact age in years, months, and days
🏠 Home & Construction 10 tools
Paint Calculator
How many gallons for any room
Square Footage
Area for rectangles, triangles, circles
Gravel Calculator
Cubic yards and tons for any project
Roofing Calculator
Squares needed with pitch multiplier
Electricity Cost
How much does it cost to run any appliance
TV Size Calculator
Ideal screen size for your viewing distance
HVAC Sizing
BTU calculation with Manual J factors
Asphalt Calculator
Tonnage for driveways and parking lots
Concrete Block
CMU blocks and mortar needed
Board Feet
Lumber volume and pricing
📚 Education & Math 6 tools
GPA Calculator
Cumulative GPA with honors weighting
Final Grade
What score do you need on the final?
Fraction Calculator
Add, subtract, multiply, divide fractions
Percentage Change
Increase, decrease, and X% of Y
Roman Numerals
Convert to and from Roman numerals
Number Base Converter
Binary, hex, decimal, octal conversion
⚡ Utilities & Productivity 12 tools
Password Generator
Cryptographic random passwords and passphrases
QR Code Generator
URL, WiFi, text, email QR codes
Word Counter
Words, characters, reading time, keywords
Text Case Converter
12 formats: camelCase, snake_case, UPPER...
Typing Speed Test
60-second WPM test with accuracy
Stopwatch
Millisecond precision with lap tracking
Countdown Timer
Set any duration with audio alarm
Color Picker
HEX, RGB, HSL with palette generation
Aspect Ratio
Resize without distortion
Download Time
How long at your internet speed
Date Calculator
Days between dates, add/subtract days
Time Zone Converter
Convert time between any cities
🎲 Fun & Games 7 tools
Dice Roller
D4-D100 with RPG presets and advantage
Coin Flip
Animated flip with stats tracker
Random Number
Any range, multi-draw, no repeats
Love Calculator
Fun name-based compatibility score
How Old Will I Be
Your age in any future year
Birthday Countdown
Days until your next birthday
Age Difference
Exact gap between two birthdays
Even More Calculators
Beyond these standalone tools, CalcWolf has 500+ calculators covering every category imaginable, plus 42 unit converters, 20 comparison tools, and 120+ blog posts with expert guides.