Invoice Calculator
Calculate invoice totals with multiple line items, tax, and optional discounts. Perfect for freelancers and small businesses.
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Invoice Total
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Subtotal —
Discount —
Tax —
Extended More scenarios, charts & detailed breakdown ▾
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Total
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Subtotal —
Tax —
Professional Full parameters & maximum detail ▾
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Invoice Breakdown
Subtotal —
Discount Applied —
Discounted Subtotal —
Tax Amount —
Invoice Total —
Late Payment Scenarios
Late Fee (30 days) —
Total + Late Fee —
How to Use This Calculator
- Enter the Quantity and Unit Price for each line item.
- Enter the applicable Tax Rate (VAT, GST, or sales tax).
- Optionally enter a Discount % to apply to the subtotal.
- The calculator shows subtotal, tax amount, and invoice total.
Formula
Subtotal = Σ (Quantity × Unit Price)
Discounted Subtotal = Subtotal × (1 − Discount%/100)
Tax = Discounted Subtotal × (Tax Rate / 100)
Total = Discounted Subtotal + Tax
Example
Invoice: 1 × $500 + 2 × $150. Tax rate 10%, discount 5%.
- Subtotal = $500 + $300 = $800
- Discount = $800 × 0.05 = $40
- Tax = ($800 − $40) × 0.10 = $76
- Total = $760 + $76 = $836
Frequently Asked Questions
- Sum all line items (quantity × price) to get the subtotal. Apply any discount to the subtotal. Then add tax on the discounted subtotal to get the final total.
- Tax is typically applied after discounts. This calculator subtracts the discount from the subtotal first, then calculates tax on the remaining amount.
- This calculator supports up to 3 line items. For more complex invoices, expand the "More options" section to access all item fields.
- Yes. Simply enter the appropriate VAT or GST rate for your jurisdiction in the Tax Rate field. The currency symbol is for display only.