✦ SOLVORY FREE TOOLS · BUSINESS & ECOMMERCE
Invoice Calculator — Free Online Tool
Create itemized invoice totals with descriptions, quantities, rates, dates, discounts and a simple tax rate. Copy or print.
JavaScript is needed for the interactive tool. The formula and worked example remain available below.
How to use the Invoice Calculator
Create itemized invoice totals with descriptions, quantities, rates, dates, discounts and a simple tax rate. Copy or print.
- Enter real measurements or prices in the interactive tool.
- Check unit labels and customize any applicable fees, waste allowances or product-specific rates.
- Review the result, formulas and limitations before using it in purchasing, pricing or production decisions.
Invoice Calculator: formula & methodology
Subtotal = sum(quantity × price). Taxable amount = subtotal − fixed discount. Invoice total = taxable amount × (1 + tax rate).
The tool uses your entered values and explicitly labeled assumptions. Final results may be rounded for display, while intermediate arithmetic retains available numeric precision. Verify material, tax, device or platform specifications relevant to your situation.
Worked example
Two $75 services and one $30 product create a $180 subtotal before discounts and tax.
Try the example above and then change values to reflect your own project or comparison.
Frequently asked questions
Does it create an accounting-compliant tax invoice?
Not automatically. Required business identifiers, jurisdictional VAT rules, invoice numbering and accounting storage vary.
Can I save the finished invoice as PDF?
Use Print / Save as PDF to open your browser’s print dialog, then choose Save as PDF if supported.
Does the invoice builder store or email invoices?
No. It calculates locally and offers printable or copyable output; it does not manage accounting records or automatically email customers.