# Stock Average Calculator: Average Cost, Fees and Break-Even

Average price per share after several buys, with SGX clearing and trading fees, broker commission and 9% GST, plus break-even price and averaging down.

Interactive tool: https://lookup.sg/tools/stock-average-calculator

## How this works
Average cost per share = total amount paid for all buys, including fees ÷ total shares held. Each buy costs shares × price plus fees. On SGX the fees are a clearing fee of 0.0325% and a trading fee of 0.0075% of the trade value, plus your broker's commission (a percentage with a minimum, from your broker's rate card), with GST at 9% on all of them (SGX fee schedule, checked October 2026).

The break-even price is the sell price at which the proceeds, after paying the same fees again on the sale, give back everything you put in. To average down, the calculator finds the smallest number of shares at today's price that brings the average cost to your target, rounded up to the board lot you choose.

This is the average cost method that brokers and the CDP show for a position. It does not subtract dividends received or adjust for partial sales, rights issues or share consolidations. Since 5 October 2026 SGX has cut the board lot to 10 shares for some counters priced above S$10, and to 1 share for counters above S$100; most stocks still trade in lots of 100.

## FAQs
### How do I calculate my average share price?
Add up what you paid for every buy and divide by the total shares. 1,000 shares at S$3.20 and 1,000 at S$2.80 cost S$6,000 for 2,000 shares, an average of S$3.00, or about S$3.0013 once SGX fees and GST of S$2.62 are included.

### How many shares do I need to buy to average down?
Shares to buy = shares held × (current average − target average) ÷ (target average − new price). Holding 2,000 shares at S$3.00, getting the average to S$2.85 with a buy at S$2.60 takes 2,000 × 0.15 ÷ 0.25 = 1,200 shares, before fees.

### What fees does SGX charge on each trade?
SGX charges a clearing fee of 0.0325% and a trading fee of 0.0075% of the trade value, 0.04% in total, and GST at 9% is added. On a S$10,000 trade that is S$4 plus S$0.36 GST, before your broker's commission.

### What is my break-even price after fees?
It is the sell price at which proceeds after selling fees equal your total cost. With 2,000 shares costing S$6,002.62 including SGX fees and no commission, you break even selling at about S$3.0026, slightly above the S$3.0013 average cost.

## Sources
- [SGX: Trading fees for securities](https://www.sgx.com/stock-exchange/trading)
- [Allen & Gledhill: SGX reduces standard board lot size (from 5 October 2026)](https://www.allenandgledhill.com/sg/perspectives/articles/33310/sgkh-sgx-reduces-standard-board-lot-size-and-enhances-custody-structure)
- [IRAS: Current GST rates](https://www.iras.gov.sg/taxes/goods-services-tax-(gst)/basics-of-gst/current-gst-rates)

---
Source: Lookup (https://lookup.sg) · Data as of October 2026 · Listings compiled from Singapore government open data (data.gov.sg), OneMap and Overture Maps places. Free listings never show contact details; contact details appear only on Lookup Verified listings.