Find how many days, on average, it takes to collect payment after a sale — a key cash-flow and collections metric.
DSO = (accounts receivable ÷ revenue) × days in period. It shows how long cash is tied up in unpaid invoices. Compare it to your payment terms — a DSO well above your net-30 or net-60 terms signals collection problems. General information only.
Days sales outstanding measures the average lag between making a sale and collecting the cash. A rising DSO means money is stuck longer in receivables, straining cash flow even when sales are strong. Comparing it to your stated terms tells you whether customers are paying on time.
DSO = (receivables ÷ revenue) × days in period
Ideally at or below your payment terms — if you invoice net-30, a DSO near 30 is healthy. Well above it means slow payers or weak collections.
Invoice promptly, offer early-payment discounts, tighten terms, and follow up on overdue accounts. Even a few days' improvement frees real cash.
Related: days inventory outstanding calculator · cash conversion cycle calculator · working capital calculator · all free calculators.
More free business metrics tools — no signup, works on any device.
Yes. The Days Sales Outstanding Calculator is completely free, runs in your browser, and never asks for a signup, email, or download. Enter your numbers and the result updates instantly.
It uses standard formulas and recalculates the moment you change a value, so the math is exact for the inputs you enter. Treat the result as a reliable planning estimate; for decisions with legal or tax consequences, confirm the figures with a qualified professional.
Yes. The calculator is mobile-friendly and works on any phone, tablet, or computer — there is no app to install and nothing to save.
Yes. Scroll to “Add this free calculator to your site” above and copy the embed snippet to place the live calculator on your blog or website for free.
Last reviewed: September 2026. Free to use, no signup — Days Sales Outstanding Calculator by ToolWise Digital.
Copy the snippet to embed the live calculator on your blog or website — free for any site. The small “Calculator by ToolWise Digital” credit line keeps it free; you're welcome to remove it, but we appreciate you leaving it.
Ready-made Google Sheets & Excel trackers for money, taxes, and small business — each with a free phone version.
Browse the shop →Subscribe and we'll email you our Simple Monthly Budget (Google Sheets & Excel, plus a phone version) — free. Then the occasional short note on pricing, bookkeeping, and the money side of a small business. No spam — unsubscribe anytime.