Convert Singapore Dollar (SGD) to Platinum Ounce (XPT)

1 singapore_dollar = 1 singapore_dollar

Exchange rates last updated: February 11, 2026 17:00

Conversion Formula for Singapore Dollar to Platinum Ounce

The formula of conversion of Singapore Dollar to Platinum Ounce is very simple. To convert Singapore Dollar to Platinum Ounce, we can use this simple formula:

1 Singapore Dollar = 2,523.4 Platinum Ounce

1 Platinum Ounce = 0.0003962907 Singapore Dollar

One Singapore Dollar is equal to 2,523.4 Platinum Ounce. So, we need to multiply the number of Singapore Dollar by 2,523.4 to get the no of Platinum Ounce. This formula helps when we need to change the measurements from Singapore Dollar to Platinum Ounce

Singapore Dollar to Platinum Ounce Conversion

The conversion of Singapore Dollar currency to Platinum Ounce currency is very simple. Since, as discussed above, One Singapore Dollar is equal to 2,523.4 Platinum Ounce. So, to convert Singapore Dollar to Platinum Ounce, we must multiply no of Singapore Dollar to 2,523.4. Example:-

Singapore Dollar Platinum Ounce
0.01 Singapore Dollar 25.234 Platinum Ounce
0.1 Singapore Dollar 252.34 Platinum Ounce
1 Singapore Dollar 2,523.4 Platinum Ounce
2 Singapore Dollar 5,046.8 Platinum Ounce
3 Singapore Dollar 7,570.2 Platinum Ounce
5 Singapore Dollar 12,617 Platinum Ounce
10 Singapore Dollar 25,234 Platinum Ounce
20 Singapore Dollar 50,468 Platinum Ounce
50 Singapore Dollar 126,170 Platinum Ounce
100 Singapore Dollar 252,340 Platinum Ounce
500 Singapore Dollar 1,261,700 Platinum Ounce
1,000 Singapore Dollar 2,523,400 Platinum Ounce

Details for Singapore Dollar (SGD) Currency

Introduction : The Singapore Dollar (SGD), denoted by the symbol S$, is the official currency of Singapore. It is subdivided into 100 cents and issued by the Monetary Authority of Singapore. Known for its strong stability and global reputation, the Singapore Dollar is one of the most traded currencies in Asia. It is widely accepted within Singapore and is used for all kinds of financial transactions, from everyday shopping to major investments. The currency is also recognized for its high-tech security features, attractive polymer banknotes, and its pivotal role in the regional financial system.

History & Origin : The Singapore Dollar was introduced in 1967, following Singapore's separation from Malaysia in 1965. Before this, Singapore used the Malaya and British Borneo dollar. Upon independence, the government established its own monetary system and introduced the SGD to assert its economic sovereignty. For a brief period, the Singapore Dollar was interchangeable with the Malaysian Ringgit at par, but this agreement ended in 1973. Since then, Singapore has maintained a managed float exchange rate system. Over the decades, the currency has gained strength and credibility, becoming a preferred currency in international trade and investment across Southeast Asia.

Current Use : The Singapore Dollar is used exclusively within Singapore and is essential for all local transactions including commerce, services, and government payments. Due to its strength and trustworthiness, it is also accepted in nearby countries such as Brunei, with which it shares a Currency Interchangeability Agreement—making the Brunei Dollar and Singapore Dollar legal tender in both nations. The SGD is frequently used in forex trading and as a reserve currency in the Asia-Pacific region. With a highly digital economy, Singapore has integrated the SGD into various digital wallets and online payment systems, further enhancing its everyday utility.

Details of Singapore

Singapore is a sovereign city-state and island nation located at the southern tip of the Malay Peninsula in Southeast Asia. Despite its small geographical size, Singapore has developed into one of the most prosperous and technologically advanced nations in the world. With a population of approximately 5.9 million, the country is known for its strategic global trade hub, robust economy, and multicultural society.

Singapore gained independence in 1965 and has since transformed from a developing port city into a thriving metropolis through strategic planning, innovation, and disciplined governance. The country operates as a parliamentary republic and places great emphasis on meritocracy, education, and economic openness. Its capital, also named Singapore, features a world-class skyline, efficient public transport, and renowned landmarks such as Marina Bay Sands and Gardens by the Bay.

Economically, Singapore is known for its strengths in finance, biotechnology, shipping, and information technology. The country boasts one of the busiest ports in the world and is a global financial center. It also attracts foreign investors due to its transparent business policies, low taxes, and political stability. Tourism is another key sector, drawing millions of visitors annually for its cleanliness, shopping, food culture, and safety.

Singapore is also famous for its unique blend of cultures, with influences from Chinese, Malay, Indian, and Western traditions. This diversity is reflected in its languages, religions, festivals, and culinary scene. English is the main working language, alongside Malay, Mandarin, and Tamil. With its commitment to innovation, sustainability, and quality of life, Singapore continues to set an example for modern urban development worldwide.

Details for Platinum (Troy Ounce) (XPT) Currency

Introduction : Platinum, symbolized as XPT and measured in troy ounces (approximately 31.1035 grams), is a rare and highly valuable precious metal traded globally. It is renowned for its strength, corrosion resistance, and aesthetic appeal, making it important in both industrial applications and luxury goods. While not used as a circulating currency, platinum functions as a commodity asset in global financial markets. It is widely recognized as a hedge against inflation and market volatility. Platinum is traded on major exchanges and is integral to several industries, especially automotive manufacturing, electronics, jewelry, and green technologies.

History & Origin : Platinum was first used by pre-Columbian civilizations in South America, but it gained recognition in the 18th century when European scientists and metallurgists began exploring its properties. It was once considered an unwanted byproduct during gold mining but eventually became valuable for its density and resistance to wear. By the 20th century, platinum was increasingly used in catalytic converters to reduce vehicle emissions and became essential in industrial chemistry and electronics. Its monetary role expanded with the introduction of platinum bullion coins and futures trading. Today, platinum is viewed both as an investment asset and a critical industrial material, especially in the push for clean energy and low-emission technologies.

Current Use : Platinum is not used in day-to-day currency transactions but is a critical asset in commodities and investment portfolios. Investors buy platinum in bars, coins, or through ETFs and futures contracts. It is extensively used in automotive catalytic converters, particularly in diesel engines, as well as in chemical reactors, medical equipment, and renewable energy technologies like hydrogen fuel cells. Platinum’s scarcity and industrial importance make it highly responsive to market changes, environmental policy shifts, and geopolitical developments. Its dual role as both a luxury material and an industrial input underscores its enduring economic and strategic value.

Details of Global (Platinum Commodity Market)

Platinum is a globally significant precious metal, with a concentrated supply chain and widespread demand across many industries. The largest producer of platinum is **South Africa**, which accounts for around 70% of the world’s annual supply. Russia, Zimbabwe, and Canada are also key contributors. These countries possess rich geological reserves and extensive mining operations. South Africa’s Bushveld Complex is one of the most important platinum-bearing geological formations globally, providing critical employment and export revenue for the country.

On the demand side, **automotive industries in the United States, Germany, Japan, and China** are major consumers of platinum, especially for its role in catalytic converters used to curb harmful emissions from vehicles. As governments worldwide tighten environmental regulations, platinum continues to play a central role in emissions control technologies. In recent years, platinum’s application in hydrogen fuel cells and green energy solutions has sparked renewed interest and innovation.

In addition to its industrial use, platinum is a symbol of prestige in the jewelry markets of India, the Middle East, and North America. Its rarity and luster make it a preferred material for high-end jewelry and luxury watches. The medical and chemical sectors also utilize platinum for its stability and biocompatibility, especially in surgical instruments, pacemakers, and laboratory equipment.

Platinum is traded on international exchanges like the NYMEX and the London Platinum and Palladium Market. It is priced in U.S. dollars per troy ounce and is influenced by mining output, global economic conditions, and speculative investment. Despite fluctuations, platinum remains a strategic resource with global economic importance. It bridges luxury, technology, and sustainability, making it a vital component in modern industry and finance.

Convert Singapore Dollar to Other Currencies

Singapore Dollar to United Arab Emirates DirhamUnited Arab Emirates Dirham to Singapore Dollar
Singapore Dollar to Afghan AfghaniAfghan Afghani to Singapore Dollar
Singapore Dollar to Albanian LekAlbanian Lek to Singapore Dollar
Singapore Dollar to Armenian DramArmenian Dram to Singapore Dollar
Singapore Dollar to Netherlands Antillean GuilderNetherlands Antillean Guilder to Singapore Dollar
Singapore Dollar to Angolan KwanzaAngolan Kwanza to Singapore Dollar
Singapore Dollar to Argentine PesoArgentine Peso to Singapore Dollar
Singapore Dollar to Australian DollarAustralian Dollar to Singapore Dollar
Singapore Dollar to Aruban FlorinAruban Florin to Singapore Dollar
Singapore Dollar to Azerbaijani ManatAzerbaijani Manat to Singapore Dollar
Singapore Dollar to Bosnia Herzegovina Convertible MarkBosnia Herzegovina Convertible Mark to Singapore Dollar
Singapore Dollar to Barbadian DollarBarbadian Dollar to Singapore Dollar
Singapore Dollar to Bangladeshi TakaBangladeshi Taka to Singapore Dollar
Singapore Dollar to Bulgarian LevBulgarian Lev to Singapore Dollar
Singapore Dollar to Bahraini DinarBahraini Dinar to Singapore Dollar
Singapore Dollar to Burundian FrancBurundian Franc to Singapore Dollar
Singapore Dollar to Bermudan DollarBermudan Dollar to Singapore Dollar
Singapore Dollar to Brunei DollarBrunei Dollar to Singapore Dollar
Singapore Dollar to Bolivian BolivianoBolivian Boliviano to Singapore Dollar
Singapore Dollar to Brazilian RealBrazilian Real to Singapore Dollar
Singapore Dollar to Bahamian DollarBahamian Dollar to Singapore Dollar
Singapore Dollar to Bhutanese NgultrumBhutanese Ngultrum to Singapore Dollar
Singapore Dollar to Botswanan PulaBotswanan Pula to Singapore Dollar
Singapore Dollar to Belarusian RubleBelarusian Ruble to Singapore Dollar
Singapore Dollar to Belize DollarBelize Dollar to Singapore Dollar
Singapore Dollar to Canadian DollarCanadian Dollar to Singapore Dollar
Singapore Dollar to Congolese FrancCongolese Franc to Singapore Dollar
Singapore Dollar to Swiss FrancSwiss Franc to Singapore Dollar
Singapore Dollar to Chilean Unit Of Account UfChilean Unit Of Account Uf to Singapore Dollar
Singapore Dollar to Chilean PesoChilean Peso to Singapore Dollar
Singapore Dollar to Chinese Yuan OffshoreChinese Yuan Offshore to Singapore Dollar
Singapore Dollar to Chinese YuanChinese Yuan to Singapore Dollar
Singapore Dollar to Colombian PesoColombian Peso to Singapore Dollar
Singapore Dollar to Costa Rican ColonCosta Rican Colon to Singapore Dollar
Singapore Dollar to Cuban Convertible PesoCuban Convertible Peso to Singapore Dollar
Singapore Dollar to Cuban PesoCuban Peso to Singapore Dollar
Singapore Dollar to Cape Verdean EscudoCape Verdean Escudo to Singapore Dollar
Singapore Dollar to Czech Republic KorunaCzech Republic Koruna to Singapore Dollar
Singapore Dollar to Djiboutian FrancDjiboutian Franc to Singapore Dollar
Singapore Dollar to Danish KroneDanish Krone to Singapore Dollar
Singapore Dollar to Dominican PesoDominican Peso to Singapore Dollar
Singapore Dollar to Algerian DinarAlgerian Dinar to Singapore Dollar
Singapore Dollar to Egyptian PoundEgyptian Pound to Singapore Dollar
Singapore Dollar to Eritrean NakfaEritrean Nakfa to Singapore Dollar
Singapore Dollar to Ethiopian BirrEthiopian Birr to Singapore Dollar
Singapore Dollar to EuroEuro to Singapore Dollar
Singapore Dollar to Fijian DollarFijian Dollar to Singapore Dollar
Singapore Dollar to Falkland Islands PoundFalkland Islands Pound to Singapore Dollar
Singapore Dollar to British Pound SterlingBritish Pound Sterling to Singapore Dollar
Singapore Dollar to Georgian LariGeorgian Lari to Singapore Dollar
Singapore Dollar to Guernsey PoundGuernsey Pound to Singapore Dollar
Singapore Dollar to Ghanaian CediGhanaian Cedi to Singapore Dollar
Singapore Dollar to Gibraltar PoundGibraltar Pound to Singapore Dollar
Singapore Dollar to Gambian DalasiGambian Dalasi to Singapore Dollar
Singapore Dollar to Guinean FrancGuinean Franc to Singapore Dollar
Singapore Dollar to Guatemalan QuetzalGuatemalan Quetzal to Singapore Dollar
Singapore Dollar to Guyanaese DollarGuyanaese Dollar to Singapore Dollar
Singapore Dollar to Hong Kong DollarHong Kong Dollar to Singapore Dollar
Singapore Dollar to Honduran LempiraHonduran Lempira to Singapore Dollar
Singapore Dollar to Haitian GourdeHaitian Gourde to Singapore Dollar
Singapore Dollar to Hungarian ForintHungarian Forint to Singapore Dollar
Singapore Dollar to Indonesian RupiahIndonesian Rupiah to Singapore Dollar
Singapore Dollar to Israeli New SheqelIsraeli New Sheqel to Singapore Dollar
Singapore Dollar to Manx PoundManx Pound to Singapore Dollar
Singapore Dollar to Indian RupeeIndian Rupee to Singapore Dollar
Singapore Dollar to Iraqi DinarIraqi Dinar to Singapore Dollar
Singapore Dollar to Iranian RialIranian Rial to Singapore Dollar
Singapore Dollar to Icelandic KronaIcelandic Krona to Singapore Dollar
Singapore Dollar to Jersey PoundJersey Pound to Singapore Dollar
Singapore Dollar to Jamaican DollarJamaican Dollar to Singapore Dollar
Singapore Dollar to Jordanian DinarJordanian Dinar to Singapore Dollar
Singapore Dollar to Japanese YenJapanese Yen to Singapore Dollar
Singapore Dollar to Kenyan ShillingKenyan Shilling to Singapore Dollar
Singapore Dollar to Kyrgystani SomKyrgystani Som to Singapore Dollar
Singapore Dollar to Cambodian RielCambodian Riel to Singapore Dollar
Singapore Dollar to Comorian FrancComorian Franc to Singapore Dollar
Singapore Dollar to North Korean WonNorth Korean Won to Singapore Dollar
Singapore Dollar to South Korean WonSouth Korean Won to Singapore Dollar
Singapore Dollar to Kuwaiti DinarKuwaiti Dinar to Singapore Dollar
Singapore Dollar to Cayman Islands DollarCayman Islands Dollar to Singapore Dollar
Singapore Dollar to Kazakhstani TengeKazakhstani Tenge to Singapore Dollar
Singapore Dollar to Laotian KipLaotian Kip to Singapore Dollar
Singapore Dollar to Lebanese PoundLebanese Pound to Singapore Dollar
Singapore Dollar to Sri Lankan RupeeSri Lankan Rupee to Singapore Dollar
Singapore Dollar to Liberian DollarLiberian Dollar to Singapore Dollar
Singapore Dollar to Lesotho LotiLesotho Loti to Singapore Dollar
Singapore Dollar to Libyan DinarLibyan Dinar to Singapore Dollar
Singapore Dollar to Moroccan DirhamMoroccan Dirham to Singapore Dollar
Singapore Dollar to Moldovan LeuMoldovan Leu to Singapore Dollar
Singapore Dollar to Malagasy AriaryMalagasy Ariary to Singapore Dollar
Singapore Dollar to Macedonian DenarMacedonian Denar to Singapore Dollar
Singapore Dollar to Myanma KyatMyanma Kyat to Singapore Dollar
Singapore Dollar to Mongolian TugrikMongolian Tugrik to Singapore Dollar
Singapore Dollar to Macanese PatacaMacanese Pataca to Singapore Dollar
Singapore Dollar to Mauritanian OuguiyaMauritanian Ouguiya to Singapore Dollar
Singapore Dollar to Mauritian RupeeMauritian Rupee to Singapore Dollar
Singapore Dollar to Maldivian RufiyaaMaldivian Rufiyaa to Singapore Dollar
Singapore Dollar to Malawian KwachaMalawian Kwacha to Singapore Dollar
Singapore Dollar to Mexican PesoMexican Peso to Singapore Dollar
Singapore Dollar to Malaysian RinggitMalaysian Ringgit to Singapore Dollar
Singapore Dollar to Mozambican MeticalMozambican Metical to Singapore Dollar
Singapore Dollar to Namibian DollarNamibian Dollar to Singapore Dollar
Singapore Dollar to Nigerian NairaNigerian Naira to Singapore Dollar
Singapore Dollar to Nicaraguan CordobaNicaraguan Cordoba to Singapore Dollar
Singapore Dollar to Norwegian KroneNorwegian Krone to Singapore Dollar
Singapore Dollar to Nepalese RupeeNepalese Rupee to Singapore Dollar
Singapore Dollar to New Zealand DollarNew Zealand Dollar to Singapore Dollar
Singapore Dollar to Omani RialOmani Rial to Singapore Dollar
Singapore Dollar to Panamanian BalboaPanamanian Balboa to Singapore Dollar
Singapore Dollar to Peruvian Nuevo SolPeruvian Nuevo Sol to Singapore Dollar
Singapore Dollar to Papua New Guinean KinaPapua New Guinean Kina to Singapore Dollar
Singapore Dollar to Philippine PesoPhilippine Peso to Singapore Dollar
Singapore Dollar to Pakistani RupeePakistani Rupee to Singapore Dollar
Singapore Dollar to Polish ZlotyPolish Zloty to Singapore Dollar
Singapore Dollar to Paraguayan GuaraniParaguayan Guarani to Singapore Dollar
Singapore Dollar to Qatari RialQatari Rial to Singapore Dollar
Singapore Dollar to Romanian LeuRomanian Leu to Singapore Dollar
Singapore Dollar to Serbian DinarSerbian Dinar to Singapore Dollar
Singapore Dollar to Russian RubleRussian Ruble to Singapore Dollar
Singapore Dollar to Rwandan FrancRwandan Franc to Singapore Dollar
Singapore Dollar to Saudi RiyalSaudi Riyal to Singapore Dollar
Singapore Dollar to Solomon Islands DollarSolomon Islands Dollar to Singapore Dollar
Singapore Dollar to Seychellois RupeeSeychellois Rupee to Singapore Dollar
Singapore Dollar to Sudanese PoundSudanese Pound to Singapore Dollar
Singapore Dollar to Swedish KronaSwedish Krona to Singapore Dollar
Singapore Dollar to Saint Helena PoundSaint Helena Pound to Singapore Dollar
Singapore Dollar to Sierra Leonean LeoneSierra Leonean Leone to Singapore Dollar
Singapore Dollar to Somali ShillingSomali Shilling to Singapore Dollar
Singapore Dollar to Surinamese DollarSurinamese Dollar to Singapore Dollar
Singapore Dollar to South Sudanese PoundSouth Sudanese Pound to Singapore Dollar
Singapore Dollar to Sao Tome And Principe DobraSao Tome And Principe Dobra to Singapore Dollar
Singapore Dollar to Salvadoran ColonSalvadoran Colon to Singapore Dollar
Singapore Dollar to Syrian PoundSyrian Pound to Singapore Dollar
Singapore Dollar to Swazi LilangeniSwazi Lilangeni to Singapore Dollar
Singapore Dollar to Thai BahtThai Baht to Singapore Dollar
Singapore Dollar to Tajikistani SomoniTajikistani Somoni to Singapore Dollar
Singapore Dollar to Turkmenistani ManatTurkmenistani Manat to Singapore Dollar
Singapore Dollar to Tunisian DinarTunisian Dinar to Singapore Dollar
Singapore Dollar to Tongan PaangaTongan Paanga to Singapore Dollar
Singapore Dollar to Turkish LiraTurkish Lira to Singapore Dollar
Singapore Dollar to Trinidad And Tobago DollarTrinidad And Tobago Dollar to Singapore Dollar
Singapore Dollar to New Taiwan DollarNew Taiwan Dollar to Singapore Dollar
Singapore Dollar to Tanzanian ShillingTanzanian Shilling to Singapore Dollar
Singapore Dollar to Ukrainian HryvniaUkrainian Hryvnia to Singapore Dollar
Singapore Dollar to Ugandan ShillingUgandan Shilling to Singapore Dollar
Singapore Dollar to United States DollarUnited States Dollar to Singapore Dollar
Singapore Dollar to Uruguayan PesoUruguayan Peso to Singapore Dollar
Singapore Dollar to Uzbekistan SomUzbekistan Som to Singapore Dollar
Singapore Dollar to Venezuelan Bolivar SoberanoVenezuelan Bolivar Soberano to Singapore Dollar
Singapore Dollar to Vietnamese DongVietnamese Dong to Singapore Dollar
Singapore Dollar to Vanuatu VatuVanuatu Vatu to Singapore Dollar
Singapore Dollar to Samoan TalaSamoan Tala to Singapore Dollar
Singapore Dollar to Cfa Franc BeacCfa Franc Beac to Singapore Dollar
Singapore Dollar to Silver Troy OunceSilver Troy Ounce to Singapore Dollar
Singapore Dollar to Gold Troy OunceGold Troy Ounce to Singapore Dollar
Singapore Dollar to East Caribbean DollarEast Caribbean Dollar to Singapore Dollar
Singapore Dollar to Special Drawing RightsSpecial Drawing Rights to Singapore Dollar
Singapore Dollar to Cfa Franc BceaoCfa Franc Bceao to Singapore Dollar
Singapore Dollar to Palladium OuncePalladium Ounce to Singapore Dollar
Singapore Dollar to Cfp FrancCfp Franc to Singapore Dollar
Singapore Dollar to Platinum OuncePlatinum Ounce to Singapore Dollar
Singapore Dollar to Yemeni RialYemeni Rial to Singapore Dollar
Singapore Dollar to South African RandSouth African Rand to Singapore Dollar
Singapore Dollar to Zambian KwachaZambian Kwacha to Singapore Dollar

FAQ on Singapore Dollar (SGD) to Platinum Ounce (XPT) Conversion:

What is the Symbol of Singapore Dollar and Platinum Ounce?

The symbol for Singapore Dollar is 'S$', and for Platinum Ounces, it is 'XPT'. These symbols are used to denote in everyday currency analysis.

How to convert Singapore Dollar(s) to Platinum Ounce(es)?

To convert Singapore Dollar(s) to Platinum Ounce(es), multiply the number of Singapore Dollars by 2523.4 because one Singapore Dollar equals 2523.4 Platinum Ounces.
Formula: Platinum Ounces = Singapore Dollars × 2523.4.
This is a standard rule used in conversions.

How to convert Platinum Ounce(es) to Singapore Dollar(s) ?

To convert Platinum Ounce(es) to Singapore Dollar(s), divide the number of Platinum Ounces by 2523.4, since, 1 Singapore Dollar contains exactly 2523.4 Platinum Ounce(es).
Formula: Singapore Dollars = Platinum Ounce(s) ÷ 2523.4.
It’s a common calculation in conversions.

How many Singapore Dollar(s) are these in an Platinum Ounce(es) ?

There are 0.00039629071887136 Singapore Dollars in one Platinum Ounce. This is derived by dividing 1 Platinum Ounce by 2523.4, as 1 Singapore Dollar equals 2523.4 Platinum Ounce(s).
Formula: Singapore Dollar = Platinum Ounces ÷ 2523.4.
It’s a precise currency conversion method.

How many Platinum Ounce(es) are these in an Singapore Dollar(s) ?

There are exactly 2523.4 Platinum Ounces in one Singapore Dollar. This is a fixed value used in the measurement system.
Formula: Platinum Ounce(s) = Singapore Dollars × 2523.4.
It's one of the most basic conversions.

How many Platinum Ounce in 10 Singapore Dollar?

There are 25234 Platinum Ounces in 10 Singapore Dollars. This is calculated by multiplying 10 by 2523.4.
Formula: 10 Singapore Dollars × 2523.4 = 25234 Platinum Ounces.
This conversion is helpful for measurements.

How many Platinum Ounce(s) in 50 Singapore Dollar?

There are 126170 Platinum Ounces in 50 Singapore Dollars. One can calculate it by multiplying 50 by 2523.4.
Formula: 50 Singapore Dollars × 2523.4 = 126170 Platinum Ounces.
This conversion is used in many applications.

How many Platinum Ounce(s) in 100 Singapore Dollar?

There are 252340 Platinum Ounce(s) in 100 Singapore Dollars. Multiply 100 by 2523.4 to get the result.
Formula: 100 Singapore Dollars × 2523.4 = 252340 Platinum Ounce(s).
This is a basic currency conversion formula.