Accounts Receivable Days (DSO) Calculator
From accounts receivable and annual revenue, work out how many days on average it takes to collect cash from sales.
輸入資料
計算結果
重點速覽：A/R Days (DSO) = accounts receivable / annual revenue x period days (usually 365). It measures collection speed and cash-flow health. Shorter is generally better; compare with your credit terms. Reciprocal of receivables turnover.
計算公式
應收帳款周轉天數 (A/R Days) = 應收帳款 ÷ 年營收 × 期間天數。
全年通常取 365 天作為期間天數。
$$\text{A/R Days} = \dfrac{\text{應收帳款}}{\text{年營收}} \times \text{期間天數}$$$$\text{A/R Days} = \dfrac{365}{\text{應收帳款周轉率}}$$使用說明
- Enter the accounts receivable balance.
- Enter annual revenue.
- Confirm the period days (365 for a year) and view A/R Days.
年營收 HK$3,650,000 (即每天 HK$10,000 營收) 時，不同應收帳款餘額對應的周轉天數
| 應收帳款 | 年營收 | A/R Days | 解讀 |
|---|---|---|---|
| HK$300,000 | HK$3,650,000 | 30 天 | 回款快，現金流健康 |
| HK$480,000 | HK$3,650,000 | 48 天 | 本工具預設值 |
| HK$600,000 | HK$3,650,000 | 60 天 | 接近月結 60 天信用期 |
| HK$900,000 | HK$3,650,000 | 90 天 | 偏長，佔壓營運資金 |
理財情境案例
案例一：計算收款天數
某公司應收帳款 HK$480,000，全年營收 HK$3,650,000 (即每天約 HK$10,000)。A/R Days = 480,000 ÷ 3,650,000 × 365 = 48 天。
代表平均要 48 天才把賒銷收回現金。若公司給客戶的信用期是『月結 30 天』,48 天明顯偏長，說明有客戶拖欠，需要跟進催收。
案例二：縮短 A/R Days 對現金流的幫助
延續上例，若公司加強催收、提供提早付款折扣，把應收帳款由 HK$480,000 降到 HK$300,000，A/R Days 縮短至 30 天。
以每天 HK$10,000 營收計，等於提早約 18 天收回貨款，釋放約 HK$180,000 現金 — 這筆錢可用於減少短期借貸、把握採購折扣或再投資，直接改善營運資金效率與財務成本。
常見問題
What is the difference between A/R Days and average collection period?
Same concept. Strict average collection period uses net credit sales as the denominator; A/R Days often uses total revenue for convenience. If sales are almost all credit, they are close; with large cash sales, total revenue overstates the days. Keep the basis consistent.
Is fewer days always better?
Generally yes — faster cash, healthier cash flow, lower bad-debt risk. But tightening credit too hard can hurt customer relations and sales. Aim to keep A/R Days around or just below your credit terms.
How does A/R Days relate to turnover?
They are reciprocals. Receivables turnover = revenue / receivables (how many times a year); A/R Days = 365 / turnover (days per cycle). Higher turnover means fewer days.
Should I use total revenue or net credit sales?
Strictly, only credit sales create receivables, so net credit sales is the correct denominator. This tool uses total revenue for convenience — fine if mostly credit; with large cash sales it understates true collection time. Use credit sales if available, and keep the basis consistent when comparing.
How does A/R Days relate to the cash conversion cycle (CCC)?
A/R Days is one of three CCC components: CCC = DIO (inventory days) + DSO (A/R Days) - DPO (payables days). It captures the 'collection' leg. Shorter A/R Days means revenue turns to cash faster, shrinking the CCC and easing working-capital pressure. Improve A/R Days, extend DPO and shorten DIO to free cash.
相關工具
參考資料
內容審核：香港計算器財經團隊。計算邏輯與公式參考香港金融管理局（HKMA）及投資者及理財教育委員會（IFEC）之個人理財計算指引，結果僅供參考，實際以相關機構公佈為準。