Smart calculators for work, time & education
Calculate overtime pay, estimate your paycheck, track your GPA, measure time durations, and more — all free, instant, and private.
Popular Calculators
The most-used tools on CalculatorHub, trusted for quick and accurate estimates.
Overtime Calculator
Calculate regular pay, overtime pay, overtime rate, and total weekly pay.
Hourly Paycheck Calculator
Estimate hourly gross pay, payroll taxes, deductions, net pay, and annualized pay.
Biweekly Paycheck Calculator
Estimate a two-week paycheck from hours, overtime, taxes, and deductions.
GPA Calculator
Estimate GPA from course letter grades and credit hours on a common 4.0 scale.
Paycheck & Overtime Calculators
Estimate overtime earnings, paycheck breakdowns, and the value of your paid time off.
Overtime Calculator
Calculate regular pay, overtime pay, overtime rate, and total weekly pay.
Overtime Pay Calculator
Break down regular pay, overtime rate, overtime pay, and total pay.
Time and a Half Calculator
Estimate 1.5x overtime pay from hourly rate, regular hours, and overtime hours.
PTO Calculator
Calculate the pay value of vacation, sick time, or other paid time off hours.
Hourly Paycheck Calculator
Estimate hourly gross pay, payroll taxes, deductions, net pay, and annualized pay.
Biweekly Paycheck Calculator
Estimate a two-week paycheck from hours, overtime, taxes, and deductions.
Time & Duration Tools
Measure elapsed time, convert between units, and plan your schedule.
Grade & GPA Calculators
Calculate weighted grades, figure out what you need on finals, and estimate your GPA.
All Calculators
Browse every calculator available on CalculatorHub.
Overtime Calculator
Calculate regular pay, overtime pay, overtime rate, and total weekly pay.
Overtime Pay Calculator
Break down regular pay, overtime rate, overtime pay, and total pay.
Time and a Half Calculator
Estimate 1.5x overtime pay from hourly rate, regular hours, and overtime hours.
PTO Calculator
Calculate the pay value of vacation, sick time, or other paid time off hours.
Hourly Paycheck Calculator
Estimate hourly gross pay, payroll taxes, deductions, net pay, and annualized pay.
Biweekly Paycheck Calculator
Estimate a two-week paycheck from hours, overtime, taxes, and deductions.
Time Duration Calculator
Find elapsed time between dates and convert days, hours, minutes, and seconds.
Weighted Grade Calculator
Calculate a weighted course grade from scores and assignment category weights.
Final Grade Calculator
Find the final exam score needed to reach your target course grade.
GPA Calculator
Estimate GPA from course letter grades and credit hours on a common 4.0 scale.
Frequently Asked Questions
Are these calculators really free?
Yes, all calculators on CalculatorHub are completely free to use with no sign-up or registration required. Just open a calculator, enter your values, and get instant results.
How accurate are these calculators?
Our calculators use standard formulas and widely accepted rates (such as 2026 Social Security wage base). However, paycheck and tax calculations are estimates. For official payroll or tax purposes, consult a professional.
Do I need to create an account?
No account needed. Every calculator works instantly in your browser. Your data stays on your device and is never sent to any server.
Can I use these on my phone?
Absolutely. All calculators are fully responsive and work great on phones, tablets, and desktop computers.
How is overtime pay calculated?
Overtime pay is calculated by multiplying your hourly rate by the overtime multiplier (commonly 1.5 for time and a half), then multiplying that rate by the number of overtime hours worked.
What GPA scale does the GPA calculator use?
The GPA calculator uses a common 4.0 scale with plus and minus grade values: A = 4.0, A- = 3.7, B+ = 3.3, B = 3.0, and so on down to F = 0.