INVOICE TOTAL
£0.00
Enter the quantity, price and VAT to calculate.
This calculator gives a simple invoice estimate based on the figures entered.
How to calculate an invoice total
An invoice total is usually calculated by multiplying quantity by unit price, subtracting any discount and then adding VAT if applicable.
Example: 5 units at £100 each
Subtotal = 5 × £100 = £500
Discount = £50
VAT at 20% = £90
Final invoice total = £540
What this calculator is for
This invoice calculator helps estimate invoice totals for products or services. It can be useful for freelancers, self-employed workers, contractors, shops, online sellers, small businesses and service providers.
The calculator includes quantity, price per unit, discount and VAT percentage. This gives a quick estimate of invoice totals before creating a formal invoice.
Invoice formula
A simple invoice formula is:
Invoice total = subtotal – discount + VAT
Subtotal is the quantity multiplied by the price per unit.
Who this invoice calculator is for
- Freelancers and consultants
- Self-employed workers
- Small businesses
- Online sellers and e-commerce businesses
- Tradespeople and contractors
- Service providers
- Retail businesses
- General business planning and quoting
Important note
This calculator is for general informational purposes only and does not provide accounting, tax or financial advice. VAT treatment may vary depending on business circumstances and tax status. Always confirm official invoice requirements with a qualified accountant or tax professional where needed.
Frequently Asked Questions
What is an invoice subtotal?
The subtotal is the total before discounts, VAT or other taxes are added.
How is VAT calculated on an invoice?
VAT is usually calculated as a percentage of the discounted subtotal.
Can this calculator be used for services?
Yes. Service providers may use quantity as hours, sessions or projects depending on their pricing structure.
Does this calculator create a formal invoice?
No. This calculator estimates invoice totals only and does not generate formal invoice documents.
Can discounts be included?
Yes. A fixed discount amount can be entered before VAT is calculated.