Your Smart Online Calculator Hub
1stcalc.com offers fast, accurate, and easy-to-use tools for everyday tasks, from health and fitness to networking. Get results instantly!
Age Calculator
Find out your exact age from your birthdate.
BMI Calculator
Check your Body Mass Index quickly and easily.
Chronological Age Calculator
Calculate exact chronological age for legal or medical use.
Compound Interest Calculator
Compute interest growth over time with compounding.
Day Calculator
Calculate the number of days between two dates.
Fuel Calculator
Estimate fuel cost and usage for trips.
IP Subnet Calculator
Calculate subnets and network addresses for IPv4.
Menopause Age Estimator
Estimate the average age of menopause based on scientific data.
Percentage Calculator
Quickly calculate percentages and changes.
Quadratic Formula Calculator
Solve quadratic equations in seconds.
Word Counter
Count words, characters, and spaces instantly.
Work Hours Calculator
Track total hours worked over multiple shifts or days.