Free Invoice Calculators

Free calculators for creating invoices, setting payment terms, calculating taxes and discounts, and managing accounts receivable.

Invoicing

Create & Price

Build invoice totals, hourly rates, and project pricing.

Invoice Calculator

Add line items, discounts, tax, and payments to get the invoice total and balance due.

Calculate

Hourly Invoice Calculator

Turn hours and hourly rates into a complete invoice total.

Coming soon

Contractor Invoice Calculator

Price contractor invoices from labor, materials, and job costs.

Coming soon

Project Invoice Calculator

Calculate a project invoice from milestones, retainers, or a fixed fee.

Coming soon

Markup & Margin Calculator

Calculate selling price, markup, margin, and profit from your cost.

Calculate

Freelance Rate Calculator

Calculate the hourly rate you need based on your income goal, expenses, and billable time.

Calculate

Billable Hours Calculator

Track billable time and convert it into an invoice amount.

Coming soon

Adjustments

Tax & Discounts

Estimate sales tax, VAT, GST, and invoice discounts.

Due dates

Payment Terms & Late Payments

Work out due dates, late fees, and days past due.

Invoice Due Date Calculator

Calculate invoice due dates for Net 7, 15, 30, 45, 60, 90, and custom payment terms.

Calculate

Business Days Calculator

Count business days between invoice date and due date.

Coming soon

Late Payment Fee Calculator

Calculate flat, percentage, or recurring late fees on overdue invoices.

Calculate

Late Payment Interest Calculator

Compute interest accrued on an unpaid invoice balance.

Coming soon

Days Past Due Calculator

Count how many days an invoice is past its due date.

Coming soon

Collections

Accounts Receivable

Measure DSO, turnover, aging, and collection performance.

DSO Calculator

Calculate Days Sales Outstanding to see how accounts receivable compares with credit sales.

Calculate

DSO Improvement / Cash Released Calculator

Estimate cash released when you shorten days sales outstanding.

Coming soon

Accounts Receivable Turnover Calculator

Measure how quickly customers pay outstanding invoices.

Coming soon

Average Collection Period Calculator

Convert receivables turnover into average days to collect.

Coming soon

AR Aging Calculator

Enter outstanding invoices to see current, 1–30, 31–60, 61–90, and 90+ day receivable balances.

Calculate

Collection Effectiveness Index Calculator

Score how much of available receivables you actually collected.

Coming soon

Bad Debt Percentage Calculator

Calculate write-offs as a percentage of credit sales or receivables.

Coming soon