If you only need a quick answer such as "150 plus GST" or "3,500 GST", these tables save you the GST calculation. The first table adds GST to a price, and the second removes GST from a total that already includes it. For any other amount, use our GST calculator.
How to add GST to a price
Total = Price × (1 + rate ÷ 100). For example, 3,500 plus 18% GST: 3,500 × 0.18 = 630 GST, so the total is 4,130.
Table 1: amount plus GST
| Price before GST | 5% GST | 12% GST | 18% GST | 28% GST |
|---|---|---|---|---|
| 100 | +5 = 105 | +12 = 112 | +18 = 118 | +28 = 128 |
| 150 | +7.50 = 157.50 | +18 = 168 | +27 = 177 | +42 = 192 |
| 500 | +25 = 525 | +60 = 560 | +90 = 590 | +140 = 640 |
| 1,000 | +50 = 1,050 | +120 = 1,120 | +180 = 1,180 | +280 = 1,280 |
| 1,500 | +75 = 1,575 | +180 = 1,680 | +270 = 1,770 | +420 = 1,920 |
| 2,000 | +100 = 2,100 | +240 = 2,240 | +360 = 2,360 | +560 = 2,560 |
| 3,500 | +175 = 3,675 | +420 = 3,920 | +630 = 4,130 | +980 = 4,480 |
| 5,000 | +250 = 5,250 | +600 = 5,600 | +900 = 5,900 | +1,400 = 6,400 |
| 10,000 | +500 = 10,500 | +1,200 = 11,200 | +1,800 = 11,800 | +2,800 = 12,800 |
| 50,000 | +2,500 = 52,500 | +6,000 = 56,000 | +9,000 = 59,000 | +14,000 = 64,000 |
Table 2: GST included in a total
Use this when the amount already includes GST, for example a receipt that says "inclusive of taxes". GST = Total × rate ÷ (100 + rate).
| Total incl. GST | 5% GST | 12% GST | 18% GST | 28% GST |
|---|---|---|---|---|
| 100 | GST 4.76 · net 95.24 | GST 10.71 · net 89.29 | GST 15.25 · net 84.75 | GST 21.88 · net 78.12 |
| 150 | GST 7.14 · net 142.86 | GST 16.07 · net 133.93 | GST 22.88 · net 127.12 | GST 32.81 · net 117.19 |
| 500 | GST 23.81 · net 476.19 | GST 53.57 · net 446.43 | GST 76.27 · net 423.73 | GST 109.38 · net 390.62 |
| 1,000 | GST 47.62 · net 952.38 | GST 107.14 · net 892.86 | GST 152.54 · net 847.46 | GST 218.75 · net 781.25 |
| 1,500 | GST 71.43 · net 1,428.57 | GST 160.71 · net 1,339.29 | GST 228.81 · net 1,271.19 | GST 328.12 · net 1,171.88 |
| 2,000 | GST 95.24 · net 1,904.76 | GST 214.29 · net 1,785.71 | GST 305.08 · net 1,694.92 | GST 437.50 · net 1,562.50 |
| 3,500 | GST 166.67 · net 3,333.33 | GST 375 · net 3,125 | GST 533.90 · net 2,966.10 | GST 765.62 · net 2,734.38 |
| 5,000 | GST 238.10 · net 4,761.90 | GST 535.71 · net 4,464.29 | GST 762.71 · net 4,237.29 | GST 1,093.75 · net 3,906.25 |
| 10,000 | GST 476.19 · net 9,523.81 | GST 1,071.43 · net 8,928.57 | GST 1,525.42 · net 8,474.58 | GST 2,187.50 · net 7,812.50 |
| 50,000 | GST 2,380.95 · net 47,619.05 | GST 5,357.14 · net 44,642.86 | GST 7,627.12 · net 42,372.88 | GST 10,937.50 · net 39,062.50 |
Need the full method with shortcuts and the common mistake to avoid? Read how to extract GST from a total amount.
Popular lookups
- 150 plus GST at 18% = 150 + 27 = 177; at 5% = 157.50.
- 3,500 GST calculator: 3,500 + 18% = 4,130 (GST 630). If 3,500 already includes 18% GST, the GST is 533.90 and the price before tax is 2,966.10.
- 10,000 plus GST at 18% = 11,800; at 5% = 10,500.
Which GST rate should I use?
The rate depends on your country and the product or service. After India's reform of 22 September 2025, most items use 5% or 18%, with 40% for selected luxury and sin goods. Other countries use different rates, for example 10% in Australia, 15% in New Zealand and 5% federal GST in Canada. Our calculator lets you type any rate, so it works wherever you are.
Related calculations
Working out a sale price after a discount and then adding GST? Use the discount calculator first, then add GST. For any other percentage increase or decrease, the percentage calculator is the quickest tool.
Calculators used in this guide
Gst calculation – FAQs
What is 150 plus GST?
At 18% GST, 150 plus GST is 177 (GST 27). At 5% it is 157.50, and at 12% it is 168.
What is 3500 plus 18% GST?
3,500 plus 18% GST is 4,130, with 630 as GST.
How much GST is included in 3500?
If 3,500 includes 18% GST, the GST is 533.90 and the price before tax is 2,966.10.
How do I calculate GST quickly?
To add GST, multiply the price by (1 + rate ÷ 100), for example × 1.18 for 18%. To remove GST from a total, divide by the same number.
Further reading: Goods and Services Tax, India (Wikipedia) · GST rate of 9% (IRAS Singapore)