About the Payroll Calculator
Running payroll means working out, for every employee and every pay period, three figures: the gross pay they have earned, the deductions that come out of it, and the net pay that lands in their bank account. On top of that, the employer has its own costs — payroll taxes and pension contributions that are paid on top of gross pay and never appear on the employee's payslip at all.
This payroll calculator works through all of it for one employee and one pay period. It handles hourly staff with overtime and salaried employees, pay periods from weekly to monthly, and the main deductions — income tax, social security and pension — as percentages you enter. It then shows the net pay, the total cost to the employer, and what those figures come to over a full year.
How to Use the Payroll Calculator
Choose the pay type: hourly or salary.
Choose the pay frequency: weekly, every two weeks, twice a month or monthly.
For hourly staff, enter the hourly rate, the regular hours in the period, any overtime hours and the overtime multiplier.
For salaried staff, enter the annual salary.
Enter the employee's income tax, social security and pension percentages, and the employer contributions percentage.
How Payroll Is Calculated
gross (hourly) = hours × rate + overtime hours × rate × multiplier
gross (salary) = annual salary ÷ pay periods per year
deductions = gross × (income tax % + social security % + pension %)
net pay = gross − deductions
employer cost = gross × (1 + employer contributions %)Each amount is rounded to the cent, as it would be on a payslip.
Step-by-Step Example
An hourly employee at 20 an hour, 40 regular hours and 5 overtime hours at time and a half, paid weekly. Income tax 12%, social security 7.65%, pension 5%, employer contributions 7.65%.
Gross pay: 40 × 20 + 5 × 20 × 1.5 = 950.00
Income tax: 950 × 12% = 114.00
Social security: 950 × 7.65% = 72.68
Pension: 950 × 5% = 47.50
Net pay: 950 − 234.18 = 715.82
Employer cost: 950 + 72.68 = 1,022.68For every 1.00 the employee takes home, the employer pays about 1.43.
Why the Rates Are Entered, Not Built In
Payroll tax rules differ between countries, and often between states or regions within them. They change every year, and the amount withheld for income tax depends on each employee's allowances, other income and personal circumstances. A single built-in table would be wrong for most people most of the time.
So this calculator takes the rates you give it. Use the effective rates from your payroll software or the official tax tables for your location. For a quick estimate, an employee's income tax rate can be approximated from last year's payslips: total tax divided by total gross pay.
Employer Costs
The employer's share of payroll costs is easy to forget because it does not appear on the payslip. Depending on the country, it can include social security or national insurance, unemployment insurance, pension contributions and other payroll levies. It is a real cost of employing someone and has to be budgeted alongside wages.
For the fuller picture — benefits, equipment, training and paid time off — use the employee cost calculator, which works out the annual cost of an employee and the cost per hour actually worked.
Running Payroll Well
Record hours accurately. Overtime, unpaid leave and sick days all change gross pay.
Keep rates up to date. Tax thresholds and contribution rates change each year.
Pay on time, every time. Late or wrong pay damages trust quickly.
Keep records. Most countries require payroll records to be kept for several years.
Check the first run. When setting up a new employee or a new rate, compare the calculation with the payroll software before paying.
Gross Pay, Taxable Pay and Net Pay
Gross pay is not always the amount that income tax is charged on. In many countries, pension contributions paid through payroll come out before income tax is worked out, which lowers taxable pay and so lowers the tax. Some benefits work the other way, adding a taxable value to pay even though no cash changes hands.
This calculator applies each percentage to gross pay, which keeps it simple and gives a good estimate. For an exact payslip, use your payroll software or the official calculators for your country, which handle these rules along with tax codes, allowances and year-to-date adjustments.
Choosing a Pay Frequency
Weekly pay is common for hourly workers and helps people on tight budgets, but it means more payroll runs and more administration. Monthly pay is simpler for the employer and common for salaried staff. Paying every two weeks is a middle ground, popular in the United States.
The frequency does not change the annual gross pay for a salaried employee, but it can change cash flow for both sides, and in some systems it slightly affects how tax is withheld through the year. Whatever frequency you choose, keep it consistent and make sure employees know exactly when they will be paid.
Understanding Your Result
Net pay is what the employee receives for the period.
Gross pay is what they earned before any deductions.
Deductions lists income tax, social security and pension.
Employer cost is gross pay plus the employer's own contributions.
Over a year multiplies net and gross by the number of pay periods.
Worth knowing compares take-home pay with the employer's total cost.
When Should You Use This Calculator?
Checking a payslip or a payroll run.
Budgeting for a new hire.
Working out the cost of overtime.
Comparing pay frequencies.
Explaining net pay to an employee.
Common Mistakes
Forgetting the overtime multiplier.
Dividing a salary by the wrong number of periods — twice a month is 24, not 26.
Leaving out employer contributions when budgeting.
Using last year's rates.
Treating gross pay as take-home pay.