Billable Hours Calculator
Split total work hours into billable and non-billable: total = hours/day x days; billable = total x billable %; the rest is non-billable.
輸入資料
計算結果
重點速覽：Billable hours are work hours you can invoice clients; the rest are non-billable (admin, meetings, training, marketing). total = hours/day x days; billable = total x billable %; non-billable = total - billable. At 8h/day, 20 days, 75% billable: total 160, billable 120, non-billable 40. The billable % is also the utilisation rate — a key metric for hourly-billing professionals. WARNING: High utilisation is not always better; balance it with client development and rest.
計算公式
總工時 = 每日工時 × 工作天數。
可計費工時 = 總工時 × 可計費比例。
不可計費工時 = 總工時 − 可計費工時。
$$\text{Total} = h \times d$$$$\text{Billable} = \text{Total} \times u,\quad \text{NonBillable} = \text{Total} - \text{Billable}$$$$h = \text{每日工時},\ d = \text{工作天數},\ u = \text{可計費比例}$$使用說明
- Enter average hours per workday and the working days in the period.
- Enter the share of hours that are billable.
- View billable and non-billable hours.
以每日 8 小時、一個月 20 個工作天 (總工時 160 小時) 為例，不同可計費比例下的工時結構與月收入 (假設費率 HK$800/時) 對照表
| 可計費比例 | 可計費工時 | 不可計費工時 | 月收入 (@HK$800/時) |
|---|---|---|---|
| 50% | 80 小時 | 80 小時 | HK$64,000 |
| 60% | 96 小時 | 64 小時 | HK$76,800 |
| 75% | 120 小時 | 40 小時 | HK$96,000 |
| 85% | 136 小時 | 24 小時 | HK$108,800 |
以每日 8 小時、20 個工作天 (總工時 160 小時) 計:可計費工時 = 160 × 可計費比例;月收入 = 可計費工時 × 費率。可見稼動率每提升，可計費工時與收入同步增加,但不可計費時間 (客戶開發、進修) 也相應被壓縮。以上為估算，數字僅供參考。
理財情境案例
自由顧問：8 小時 × 22 天 × 稼動率 70%
一名自由顧問某月工作 22 天、每日 8 小時，估計其中 70% 的時間可向客戶計費。總工時 = 8 × 22 = 176 小時,可計費工時 = 176 × 70% = 123.2 小時,不可計費工時 = 176 − 123.2 = 52.8 小時。若其費率為 HK$900/時，該月可計費收入約 = 123.2 × 900 ≈ HK$110,880。
那 52.8 小時的不可計費時間,包含提案報價、行政、進修與行銷等 — 雖不能直接收費,卻是維持案源與競爭力的必要投資。顧問可據此檢視:哪些不可計費活動應保留,哪些 (如重複行政) 可自動化或外包，以在不犧牲長期發展的前提下釋放更多可計費時間。
稼動率由 60% 提升到 75%：多賺多少？
同樣是每月 160 小時 (每日 8 小時 × 20 天)，若把稼動率由 60% 提升到 75%:可計費工時由 160 × 60% = 96 小時增至 160 × 75% = 120 小時,多出 24 小時。以費率 HK$800/時 計,單月收入即多 24 × 800 = HK$19,200,一年 (以 12 個月估) 差距可達約 HK$230,400。
這說明對按時計費者而言，『提升稼動率』的槓桿效果非常顯著 — 不必延長工時，只要把既有時間中可計費的比例提高，收入就明顯上升。但同時要警惕:把稼動率推得太高會壓縮休息與成長時間，帶來過勞風險。健康的做法是設定一個『合理而可持續』的目標稼動率，而非一味最大化。
常見問題
How are billable and non-billable hours calculated?
Step 1: total hours = hours/day x working days (e.g. 8 x 20 = 160). Step 2: billable = total x billable % (160 x 75% = 120). Step 3: non-billable = total - billable (160 - 120 = 40). Billable = time spent on client-chargeable work; non-billable = admin, meetings, training, marketing, pitching. The split is essential for anyone billing by the hour.
What does billable % (utilisation) mean — higher is better?
It is the share of your time that generates direct revenue. Higher usually means more income potential. But pushing it too high squeezes client development, training and rest, hurting long-term sustainability and risking burnout. Aim for a reasonable, sustainable target rather than maximum.
How do I use this to manage time and income?
Set a baseline, then reverse-engineer income targets (billable hours x rate = revenue). Analyse non-billable time: keep what is valuable (pitching, training), cut or automate what is low-value (repetitive admin). Adjust the billable % to plan capacity and pricing. Pair with hourly-rate and income calculators.
How do I turn rate and utilisation into monthly/annual income?
Monthly billable hours = hours/day x working days x utilisation. At 8h/day, 20 days, 75%: 120 billable hours. Income = 120 x rate. At HK$800/h that is HK$96,000/month, about HK$1.15m/year (adjust for time off). Levers: raise rate, raise utilisation, or add hours — rate and utilisation are more sustainable than longer hours. Note this is gross; deduct costs, profits tax/salaries tax and bad debts.
What is a reasonable utilisation rate?
No universal number — it varies by field and seniority. But 100% is neither realistic nor healthy; everyone needs non-billable time for pitching, quotes, admin and rest. Build your own baseline, then raise it gradually. Improve it by cutting low-value admin via tools/outsourcing, not by cutting rest or learning.
相關工具
參考資料
內容審核：香港計算器財經團隊。可計費工時與稼動率之計算邏輯屬通用時間管理與專業服務業計費方法，費率與收入假設參考市場一般水平，結果僅供估算參考，實際收入須結合費率、收款、成本與稅務評估。