You have to calculate it as per the SDLT rate. But, Stamp Duty calculation involves a couple of variables that determine how much you need to pay when buying a property. The latest UK regulations says that every buyer has to pay Stamp Duty Land Tax (SDLT) if the property purchased has the current SDLT threshold of £125,000. This calculation is usually done by a conveyancer.
Following is the list of Stamp Duty charges for the property of different valuation:
Property or lease premium or transfer value SDLT rate
Up to £125,000 Zero
£125,001 to £250,000 2%
£250,001 to £925,000 5%
£925,001 to £1.5 million 10%
Above £1.5 million 12%
You can calculate the amount of Stamp Duty you have to pay using this link: www.tax.service.gov.uk/calculate-stamp-duty-land-tax/#/intro