Invoice & receipt calculators
26 quick calculators for pricing, tax, late fees and accounts receivable — no signup, everything runs in your browser.
Small invoicing sums are easy to get wrong. These 26 calculators work out tax, discounts, markup, hourly rates, due dates, late fees and overdue balances in seconds. Enter your numbers, read the result and copy it into your invoice.
Everything runs in your browser and nothing is stored. Results are estimates for general guidance. Tax rates and late-fee rules differ by country, so confirm important figures with an accountant or an official source.
Create & Price
Work out what to charge: project fees, hourly invoices, retainers, markup, margin and your own freelance rate.
- Invoice CalculatorWork out an invoice total with a percentage or fixed discount, tax, shipping and any deposit already paid.
- Hourly Invoice CalculatorTurn hours worked into an invoice total, with overtime pay, tax and reimbursable expenses.
- Contractor Invoice CalculatorPrice a contractor invoice: labor, marked-up materials, expenses, tax and retainage withheld.
- Project Invoice CalculatorSplit a fixed project fee into a deposit and installments, with tax and a full payment schedule.
- Markup CalculatorGet a selling price from cost and markup, plus the margin it gives you, price with tax and totals for a quantity.
- Margin CalculatorFind your gross margin from cost and price — or the price you need to hit a target margin.
- Freelance Rate CalculatorFind the hourly and day rate you need to take home your target income after tax, expenses and time off.
- Billable Hours CalculatorMeasure your utilization, billable revenue and how far you are from your target.
- Retainer CalculatorPrice a monthly retainer with a commitment discount and see the effective rate and contract value.
Tax & Discounts
Add or remove sales tax, VAT and GST, and see what an early payment or volume discount does to a total.
- Sales Tax CalculatorAdd US-style sales tax (state + local) to a price, or pull it out of a tax-inclusive amount.
- VAT CalculatorAdd VAT to a net price, or extract VAT from a VAT-inclusive amount.
- GST CalculatorAdd or remove GST, with an optional provincial PST/QST shown separately.
- Invoice Discount CalculatorApply a percentage or fixed discount to an invoice, then tax, and see the effective discount.
- Early Payment Discount CalculatorSee the deadlines, savings and true annual return of an early-payment discount like 2/10 net 30.
Payment Terms & Late Payments
Find due dates, count business days and calculate late fees or interest on an overdue invoice.
- Invoice Due Date CalculatorFind an invoice's due date for Net, end-of-month (EOM) or due-on-receipt terms, with weekend handling.
- Business Days CalculatorAdd business days to a date, or count the business days between two dates — minus holidays.
- Late Payment Fee CalculatorCalculate late fees charged monthly, weekly, daily or once — by dates or number of periods, with compounding, grace period and a cap.
- Late Payment Interest CalculatorCalculate interest on an overdue invoice from dates or days, with annual or monthly rates and simple, monthly or daily compounding.
- Days Past Due CalculatorSee how many calendar and business days an invoice is past due, and which aging bucket it falls into.
Accounts Receivable
Track what customers owe you, measure how fast they pay and estimate the cost of unpaid invoices.
- DSO CalculatorCalculate Days Sales Outstanding, plus best-possible DSO and average days delinquent.
- DSO Improvement CalculatorSee how much cash you free up — and interest you save — by collecting faster.
- Accounts Receivable Turnover CalculatorCalculate your receivables turnover ratio from beginning and ending AR, and the days it implies.
- Average Collection Period CalculatorFind the average number of days it takes to collect, and how far that is beyond your payment terms.
- AR Aging CalculatorBreak overdue receivables into aging buckets and estimate the bad-debt allowance you need.
- Collection Effectiveness Index CalculatorMeasure how much of what you could collect in a period you actually collected, with a rating.
- Bad Debt Percentage CalculatorCalculate your bad-debt percentage net of recoveries, and project next period's bad debt.