💰 Financial
📐 Math & Conversion
⚙️ Engineering
🏋️ Health & Fitness
📊 Statistics
⏰ Time & Date
📝 Text & Word
🏗️ Construction
Financial Calculators
25,000+ CALCULATORS$1 Buyout Lease Calculator
Calculate lease payments with $1 end-term buyout
$1M Mortgage Calculator
Million-dollar mortgage payment calculator
$1M Loan Calculator
Monthly payment for 1 million dollar loan
1099 Tax Calculator
Self-employment tax with write-off deductions
USD to Rupee Calculator
Dollar to Indian rupee conversion
USD to Euro Calculator
Dollar to Euro currency converter
USD to Peso Calculator
Dollar to Mexican peso conversion
Interest Rate Calculator
12% club interest rate calculations
Annual Return Calculator
12% annual investment return calculator
10-Year Land Loan
Land loan payment calculator
$1M Retirement Calculator
Plan your retirement savings goal
$1M Annuity Calculator
Million-dollar annuity payment schedule
Math & Conversion Calculators
20,000+ CALCULATORSMeter to Feet Calculator
Convert meters to feet and inches
Meter to Inches Calculator
Precise meter to inch conversion
1:12 Ratio Calculator
Calculate 1:12 ratio proportions
Fraction Calculator
Add, subtract, multiply fractions
1:12 Slope Calculator
Calculate slope angle and rise/run
Proportion Z-Test
Statistical proportion hypothesis test
1:12 Scale Calculator
Scale model size calculations
Degree to Meter Calculator
Angular to linear distance conversion
12-Degree Angle Calculator
Calculate triangle sides from angles
Cubic Meter Calculator
Cubic meter volume calculations
Base-12 Number Calculator
Duodecimal number system conversions
Square Meter to Feet
Convert square meters to square feet
Physics & Engineering Calculators
15,000+ CALCULATORS0-60 Torque Calculator
Calculate 0-60 time using torque
0-100 Torque Calculator
0 to 100 mph acceleration with torque
10m Yagi Antenna
Yagi antenna element dimensions
10m Dipole Antenna
Dipole antenna length calculator
Circuit Theory Calculations
Electrical circuit hand calculations
12-Bit ADC Calculator
ADC resolution and voltage reference
12V Voltage Drop
12-volt circuit voltage drop calculator
10m Vertical Antenna
Vertical antenna dimensions for 10 meters
1/4 Mile Torque Calculator
Quarter mile ET from torque and weight
12dB Crossover Calculator
Audio crossover frequency design
12-Bit Binary Calculator
Binary to decimal, hex conversions
11m Yagi Antenna
CB band Yagi antenna calculator
Health & Fitness Calculators
8,000+ CALCULATORS12-3-30 Calorie Calculator
Calories burned on 12-3-30 workout
12-3-30 Workout Calories
Extended treadmill workout calculator
1-Rep Max Calculator
Calculate your one-rep maximum lift
Urine Protein Calculator
12-hour urine protein measurement
Creatinine Clearance
Kidney function from urine creatinine
100m Dash Calculator
Sprint speed and world record comparison
10m Walk Test Calculator
Walking speed assessment tool
Body Shape Calculator
Determine your body shape type
Statistics & Data Calculators
7,000+ CALCULATORSConfidence Interval (1-Prop)
1-proportion confidence interval
1-Proportion Z-Test
Z-test for a single proportion
Z-Test Online Calculator
Online proportion z-test calculator
Hypothesis Test (Population)
Population proportion hypothesis test
Sample Proportion CI
1-sample proportion confidence interval
Z-Test for Population
Z-test for population proportion
CI Estimate Calculator
Confidence interval estimates for proportions
ANOVA F-Test P-Value
Calculate ANOVA F-test significance
Time & Date Calculators
5,000+ CALCULATORS12-Hour Shift Calculator
Plan and calculate 12-hour shift hours
12-Hour Time Calculator
Add and subtract 12-hour time values
12/24-Hour Clock Converter
Convert between 12 and 24 hour time
12 Hours from Now
Calculate what time 12 hours from now
12-Hour Shift Salary
Annual salary from 12-hour shift pay
12-Hour Day Rate
Calculate day rate from hourly wage
12-Hour Urine Collection
Timed urine collection calculator
12H to 24H Converter
Convert 12-hour to 24-hour clock format
Text & Word Calculators
3,000+ CALCULATORSWord Calculator
Count words, characters, and more
Word Value Calculator
Calculate per-word writing earnings
$100 Word Calculator
Find words with letter values summing to $100
$100 Words Challenge
The classic $100 word challenge calculator
Cents Per Word Calculator
Calculate writing payment by word count
10 Cents/Word Calculator
Freelance writing earnings calculator
1000 Words VO Calculator
Voiceover timing for 1000 words
Word Count Calculator
Count words, sentences, and paragraphs
Construction & Roofing Calculators
4,000+ CALCULATORS1:12 Roof Pitch Calculator
Roof pitch angle, rise, and run calculator
10:12 Roof Pitch Calculator
Calculate 10:12 pitch dimensions
12:12 Roof Pitch Calculator
45-degree roof pitch calculations
1:12 Ramp Calculator
ADA-compliant ramp slope calculator
Concrete Mix Calculator
1 cubic meter concrete mix ratios
Concrete Block Calculator
Count concrete blocks for projects
Floor Truss Calculator
12-inch floor truss design tool
Fence Post Concrete
Concrete needed for fence posts