🛠️ All Tools & Calculators
⚡ 128 standalone tools · 500 core calculators · No sign-up required
💰 Finance & Money 23
Mortgage Calculator
Monthly payments, amortization, total interest
Compound Interest
Watch your money grow over time
Paycheck Calculator
Take-home pay after all taxes and deductions
Salary to Hourly
Convert between annual salary and hourly rate
Refinance Calculator
Should you refinance? Breakeven analysis
Loan Payoff
How extra payments crush debt faster
Student Loan Calculator
Payoff timeline with extra payment impact
Savings Goal
Monthly amount needed for any goal
Inflation Calculator
What is money worth over time?
Rent Affordability
How much rent can you actually afford?
Tax Refund
Estimate your federal tax refund
Social Security
Estimate your SS benefits by claiming age
Rent vs Buy
Compare true cost of renting vs buying
Net Worth Percentile
Where you rank vs Americans your age
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
Budget Calculator
50/30/20 budget breakdown
Tip Calculator
Calculate tips and split the bill
Unit Price Calculator
Which product is the better deal?
Bill Split
Split the check with tip calculation
Discount Calculator
Calculate sale prices and stacked discounts
Financial Health Score
10-question quiz with personalized score
📐 Math & Education 19
GPA Calculator
Calculate cumulative GPA on 4.0 scale
Final Grade Calculator
What grade do you need on the final?
Weighted Grade Calculator
Calculate weighted class average
Quadratic Formula Solver
Solve ax² + bx + c = 0 with steps
Slope Calculator
Slope, equation, distance between two points
Fraction Calculator
Add, subtract, multiply, divide fractions
Z-Score Calculator
Standard score, percentile, and probability
Permutation & Combination
nPr and nCr with formulas
Scientific Notation
Convert and calculate in scientific notation
Percentage Calculator
Percentage change, difference, and more
College Cost Calculator
4-year total cost: in-state vs out-of-state vs private
Study Hours Calculator
How much should you study per week?
Date Calculator
Days between dates, add/subtract days
Random Number Generator
Random numbers, dice, coins, list picker
Roman Numeral Converter
Convert between Roman and Arabic numerals
Number Base Converter
Binary, octal, decimal, hex conversion
Word Counter
Words, characters, sentences, reading time
Scientific Calculator
Full scientific calculator with memory
Multiplication Table
Interactive times table up to 20x20
💒 Wedding Planning 9
Wedding Budget Calculator
Full budget with customizable categories
Wedding Alcohol Calculator
Beer, wine, and liquor quantities for your reception
Wedding Guest List
How many guests can you afford?
Wedding Catering
Food quantities per guest by service style
Wedding Seating Chart
Tables, layout, and space requirements
Wedding Tip Calculator
Who to tip, how much, and when
Wedding Day Timeline
Hour-by-hour schedule builder
Wedding Cake Calculator
Tiers and servings needed for your guest count
Wedding Cost Per Guest
True all-in cost per head
🏅 Sports & Athletics 26
BJJ Belt Calculator
Time to each belt in Brazilian Jiu Jitsu
BJJ Gi Size
Find your perfect gi size by height/weight
BJJ Weight Class
IBJJF competition division finder
BJJ Points Calculator
Live IBJJF match scorer with undo
BJJ Mat Time
Total hours on the mat tracker
BJJ Cost Calculator
Annual cost of training BJJ
BJJ Bracket Calculator
Matches needed to win gold
BJJ Injury Calculator
Recovery timelines for 18 common injuries
Martial Arts Belt
Time to black belt in 6 martial arts
Boxing Round Timer
Configurable timer with audio bell
Powerlifting Calculator
Total, DOTS score, and classification
Race Time Predictor
Predict finish time from a recent result
Wrestling Weight
Safe weight class planning
Triathlon Calculator
Sprint through full Ironman predictions
Climbing Grade Converter
YDS, French, V-Scale, Font grades
Baseball Stats
ERA, AVG, OBP, SLG, OPS, WHIP
Basketball True Shooting
TS%, eFG%, and advanced metrics
Athletic Testing
40-yard dash, vertical jump, combine stats
Cycling FTP
FTP and 7 power training zones
Rowing Pace
Splits, watts, and distance predictions
CrossFit WOD Scaler
Scale workout weights to your level
Disc Golf Rating
Estimate your PDGA rating
Surfing Wave Calculator
Wave height, period, and board sizing
Hiking Calculator
Calories, time, and water needs
Ski Season Pass
Break-even analysis vs day tickets
Youth Sports Cost
What travel ball actually costs per year
💪 Health & Body 12
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
Due Date Calculator
Pregnancy due date with milestone timeline
Meat Temperature
Safe internal temps for every protein
Age Calculator
Exact age in years, months, and days
Dog Age Calculator
Dog years to human years (size-adjusted)
Screen Time Calculator
How much of your life is on screens?
Pace Calculator
Running pace, splits, and race times
💻 Tech & Developer 12
JSON Formatter
Format, validate, and beautify JSON
Color Converter
Hex, RGB, HSL instant conversion
Password Strength
Test password strength with crack time
BPM Calculator
Tap tempo and BPM to milliseconds
Download Time
How long to download any file size
Aspect Ratio
Calculate and convert aspect ratios
QR Code Generator
Generate QR codes for any URL or text
Password Generator
Generate secure random passwords
Subnet Calculator
IP subnetting and CIDR notation
Color Picker
Pick colors and get hex/RGB values
Text Case Converter
UPPER, lower, Title, camelCase
Typing Test
Test your typing speed in WPM
🏠 Home & DIY 11
Concrete Calculator
Cubic yards and bags for slabs, footings, columns
Paint Calculator
How many gallons for any room
Square Footage
Area of any room or space
Roofing Calculator
Shingles and materials needed
Gravel Calculator
Tons and cubic yards for your project
Electricity Cost
How much does it cost to run any appliance?
HVAC Sizing
Right AC/furnace size for your home
Board Feet
Calculate lumber in board feet
Asphalt Calculator
Tons of asphalt for paving
Concrete Block
CMU blocks for any wall
TV Size Calculator
Optimal TV size for your viewing distance
🛠️ Everyday Tools 13
Cooking Converter
Cups, tablespoons, ounces, grams
Gas Mileage Calculator
MPG, trip cost, and fuel comparison
Countdown Timer
Timer with alarm for any duration
Stopwatch
Precise stopwatch with lap times
Shoe Size Converter
US, EU, UK shoe size conversion
Time Zone Converter
Convert times between time zones
Time Card Calculator
Calculate hours worked from clock in/out
Overtime Calculator
Calculate overtime pay with different rates
Coin Flip
Virtual coin flipper
Dice Roller
Roll any type of dice
Love Calculator
Fun compatibility calculator
Birthday Countdown
Days until your next birthday
How Old Will I Be
Your age on any future date
Looking for even more? Browse all 500 core calculators or check out our blog for guides and tips.