Singapore
Singapore Business Calculators — GST, Working Days, Invoice Dates & Freight Tools
Free Singapore business calculators — GST at 9%, working days with 11 public holidays excluded, invoice due dates from Net 30/60/90, freight CBM, gross margin, and markup. All tools are browser-based with no sign-up required.
9%
GST rate
S$1M
GST registration threshold
~251
Working days/year
11
Public holidays
Start here
What do you need to calculate?
Calculate Singapore working days
11 public holidays excluded for 2026
Add Singapore GST at 9%
Current rate since Jan 2024
Get invoice due date
Net 30/60/90 → exact calendar date
Find Singapore real due date
Adjust when due date hits a holiday
Calculate CBM for sea freight
Singapore port LCL/FCL volume
Check gross margin
GST-exclusive cost vs selling price
Practical use cases
Useful for Singapore businesses
Accounts receivable
Issue invoices with Net 30 terms and instantly see the exact due date, adjusted for Singapore public holidays.
Singapore real due dateGST compliance
Add or reverse Singapore GST at 9% for invoices, purchase orders, and financial reports.
Singapore GST calculatorPayroll & HR
Count working days for a pay period or notice period with all 11 Singapore public holidays pre-loaded.
Singapore working daysFreight & logistics
Quote LCL sea freight from Singapore port with CBM calculations for carton and pallet shipments.
CBM for sea freightProject management
Add business days to a start date to set accurate delivery and approval deadlines with holidays excluded.
Add business daysPricing & margin
Calculate gross margin and markup on VAT-exclusive prices before applying GST to the final quote.
Margin calculatorMost searched in Singapore
Tax & GST
Working Days
Workflow tip
Use this in your Singapore workflow
After calculating GST, invoice due dates, or working days, save the result into your team SOP, spreadsheet, CRM, Slack, Notion, email or checklist. Use the Copy result summary button in each calculator to paste a ready-made note your team can reference without recalculating.
Workflows
Singapore Business Workflows
Invoicing & AR Workflow
- 1. Issue invoiceInvoice Due Date Calculator
Set Net 30 or Net 60 due date from invoice date
- 2. Adjust for public holidaysReal Due Date Calculator
Move due date to next business day if needed
- 3. Count days until dueBusiness Days Calculator
See exactly how many working days until due
GST & Pricing Workflow
- 1. Check gross marginMargin Calculator
Use GST-exclusive prices when calculating margin
- 2. Apply markupMarkup Calculator
Set selling price from cost plus markup %
- 3. Add 9% GSTSingapore GST Calculator
Add 9% GST to get the customer total
Freight & Logistics Workflow
- 1. Calculate cargo CBMCBM Calculator
Get total m³ for LCL sea freight quote
- 2. Find delivery deadlineAdd Business Days
Dispatch + transit days to arrival date
- 3. Set payment dateInvoice Due Date Calculator
Match supplier invoice to working-day terms
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All Tools
All Singapore Business Tools
Singapore GST Calculator
Add or remove Singapore GST at the current 9% rate. Shows pre-GST, GST, and total.
Singapore Working Days Calculator
Count working days with Singapore's 11 public holidays excluded for 2026.
Business Days Calculator
Count working days between any two dates, weekends excluded.
Add Business Days
Find the date that is N business days from any start date.
Invoice Due Date Calculator
Exact payment due dates from Net 7, 14, 30, 60, 90 terms.
Real Due Date Calculator
Adjust due date to next business day when it falls on a weekend or holiday.
Margin Calculator
Gross profit margin from cost and selling price — essential for Singapore trading.
Markup Calculator
Calculate selling price from cost plus markup percentage.
CBM Calculator
Shipping volume in cubic metres for LCL sea freight from Singapore and regional ports.
Work Hours Calculator
Total hours across shifts with break deduction — payroll and billing.
Reference
Singapore GST Key Facts
| Item | Detail |
|---|---|
| GST rate | 9% (increased from 8% on 1 Jan 2024) |
| Registration threshold | S$1,000,000 annual taxable turnover |
| GST-free (zero-rated) | Exports, international services |
| Exempt supplies | Financial services, sale/lease of residential properties |
| Filing frequency | Quarterly (most businesses) |
| IRAS | Inland Revenue Authority of Singapore administers GST |
Rates and thresholds correct as of 2026 — verify with IRAS for current guidance.
FAQ
Singapore Business FAQs
What is Singapore's GST rate?
9% since 1 January 2024, up from 8% in 2023. Singapore introduced GST in 1994 at 3%.
When does a Singapore business need to register for GST?
When taxable turnover exceeds S$1,000,000 in a 12-month period. Voluntary registration is allowed below the threshold.
How many public holidays are there in Singapore?
11 gazetted public holidays in 2026, including Chinese New Year (2 days), Deepavali, Hari Raya Puasa, Hari Raya Haji, National Day, and Christmas.
What are standard payment terms in Singapore?
Net 30 is common in B2B. Late payment interest provisions apply under the Late Payment of Commercial Debts Act (Cap. 163A).
How many working days in Singapore in 2026?
Approximately 251: 365 minus 104 weekends minus 11 public holidays on weekdays.
How do I calculate CBM for a Singapore freight shipment?
Measure length × width × height in metres for each carton type, multiply by quantity. The CBM Calculator handles multiple item types and shows sea freight and air freight volumetric weights.
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All Singapore tools are free and browser-based. No sign-up required.