Employee Cost Per Hour Calculator UK

This calculator works out the true cost of an employee per hour in the UK. You enter the annual gross salary, plus optional employer costs like pension contributions, and it returns the cost per hour based on standard working hours. It uses the standard formula: total annual employment cost divided by annual paid hours.

Formula

The calculator uses the standard “true cost of employment” formula:

Cost per hour = (Gross annual salary + Employer pension contributions + Employer National Insurance + Other annual costs) ÷ (Paid hours per week × Paid weeks per year)

Where:

• Gross annual salary (£): the employee’s base pay before deductions.
• Employer pension contribution (%): the percentage of salary the employer pays into a workplace pension (auto-enrolment minimum is 3% for most employers).
• Employer National Insurance (%): the rate paid by the employer on earnings above the secondary threshold (13.8% for most employees in 2024/25).
• Other annual costs (£): training, equipment, recruitment, bonuses, and any other employment-related expenses.
• Paid hours per week (hours): contracted hours, typically 37.5 or 40.
• Paid weeks per year (weeks): usually 52, but could be less for term-time or seasonal roles.

Worked Example

Using the defaults: a salary of £30,000, 37.5 hours/week, 52 weeks/year, 3% pension, 13.8% NI, and £500 other costs.

1. Employer pension: £30,000 × 3% = £900
2. Employer NI: £30,000 × 13.8% = £4,140
3. Total annual cost: £30,000 + £900 + £4,140 + £500 = £35,540
4. Annual paid hours: 37.5 × 52 = 1,950
5. Cost per hour: £35,540 ÷ 1,950 = £18.23

The calculator shows £18.23 per hour, matching the manual calculation.

Why Use This Calculator?

Most people think an employee’s cost is just their salary. But in the UK, the employer also pays National Insurance and often pension contributions. Plus there are hidden costs like training, equipment, and recruitment. This calculator gives you the real hourly cost, which is useful for:

• Budgeting for a new hire
• Comparing the cost of full-time vs. part-time or contract staff
• Setting internal charge-out rates for services
• Deciding whether to outsource a task

What to Include in “Other Annual Costs”

The “other costs” field is flexible. Common items to include:

• Training and professional development
• Laptop, phone, and software licences
• Recruitment fees or advertising
• Uniforms or safety equipment
• Bonuses and commission (if not in base salary)
• Health insurance or other benefits

Be careful not to double-count. If a benefit is already in the salary figure, don’t add it again. The calculator is a starting point – adjust it to your specific situation.

Common Mistakes and Misconceptions

Mistake 1: Using net pay instead of gross. The cost to the employer is the gross salary, not what the employee takes home. Net pay is after tax and employee NI, which are not paid by the employer.

Mistake 2: Forgetting the pension. Auto-enrolment means most employers must contribute at least 3% of qualifying earnings. If you forget this, you underestimate cost by about 3%.

Mistake 3: Using 52 weeks for part-time or term-time workers. If someone works 30 weeks a year, use 30, not 52. The calculator lets you adjust this.

Mistake 4: Ignoring the NI threshold. Employer NI is only paid on earnings above the secondary threshold (currently £9,100 per year). For very low salaries, the actual NI may be less than 13.8% of the whole salary. The calculator assumes the full salary is above the threshold, which is true for most full-time roles but not for very low earners.

Limitations of This Calculator

This is a simplified model. It does not account for:

• The employer NI secondary threshold – for accurate NI on low salaries, you need to subtract the threshold first.
• Apprenticeship Levy (0.5% on payroll over £3 million) – only applies to large employers.
• Statutory payments like maternity or sick pay – these are paid by the employer but may be reclaimed.
• Overhead costs like office space, utilities, and management time – these are not included unless you add them to “other costs”.

For a full cost, you would add a share of overheads, but that varies hugely by industry and role.

How to Use the Result

Once you have the cost per hour, you can compare it to:

• Contractor or agency rates – if a contractor charges £25/hour, that might be cheaper than a £30k employee once you add all costs.
• Revenue per hour – if the employee generates more than their cost, they are profitable.
• Minimum wage – ensure you are paying at least the legal minimum, but this calculator is about cost, not compliance.

Remember, the cost per hour is not the same as the charge-out rate. If you bill a client for an employee’s time, you need to add a margin for overheads and profit.

Frequently Asked Questions

What is the employer NI rate in the UK?

As of the 2024/25 tax year, the main rate is 13.8% on earnings above the secondary threshold (£9,100 per year). There are lower rates for some apprentices under 25 and for employees in freeport areas, but this calculator uses the standard 13.8%.

Do I have to pay a pension contribution?

Most employers must auto-enrol staff into a workplace pension and contribute at least 3% of qualifying earnings (the employee pays 5% if they don’t opt out). Some employers pay more, which is why the calculator has a field for it.

How do I account for holiday pay?

Holiday pay is already included in the annual salary figure. The calculator uses paid weeks per year, which is usually 52, so holidays are already factored in. If you use a different number, make sure it reflects actual paid weeks.

Is the cost per hour the same as the hourly rate?

No. The hourly rate is the salary divided by hours. The cost per hour includes employer NI, pension, and other costs. For example, a £30k salary at 37.5 hours/week gives an hourly rate of £15.38, but the true cost is £18.23 per hour.

Can I use this for part-time employees?

Yes. Enter the part-time salary and the actual paid hours per week. The calculator will give the cost per hour for that specific arrangement. For example, a part-timer earning £15,000 for 20 hours/week would have a different cost per hour than a full-timer.

What if the employee is on a salary below the NI threshold?

If the annual salary is below £9,100, the employer pays no NI. In that case, set the NI rate to 0% in the calculator. For salaries just above the threshold, the actual NI is less than 13.8% of the whole salary, so the calculator overestimates slightly. For most full-time roles, the error is small.

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in s | Annual gross salary | £ | 30000 | 0
in h | Paid hours per week | hours | 37.5 | 0
in w | Paid weeks per year | weeks | 52 | 0
in p | Employer pension contribution | % | 3 | 0
in n | Employer NI rate | % | 13.8 | 0
in o | Other annual costs (training, equipment) | £ | 500 | 0
out c | Cost per hour | £/hour | (s + s*(p/100) + s*(n/100) + o) / (h * w) | 2
out annual | Total annual cost | £ | s + s*(p/100) + s*(n/100) + o | 2