money · free calculator
Exchange rate comparison calculator
Compare two exchange offers on the same amount of home currency. Enter each baht-per-unit quote and its fees. Optional advanced fields accept fixed home-currency fees and percentage fees. It ranks only the numbers you enter; it does not recommend a provider or verify a quote.
Optional details
Complete the main fields. Optional details start at zero. Example inputs are fictional, not local quotes.
Your calculation
Result from your inputs
Complete the main fields to see a result. Inputs stay in this page.
See the calculation.
For each offer: net baht = (source amount × (1 − percentage fee ÷ 100) − fixed home-currency fee) × quoted THB per unit − fee in baht. Difference = net A − net B. Effective THB per home unit = net baht ÷ source amount, or 0 when the source amount is 0.
A worked example
At 100 units, illustrative fee-free rates of 35 and 34.8 differ by 20 baht.
What the result leaves out
Both offers must use the same source currency and original source amount. The percentage fee applies to that original amount, then the fixed home-currency fee is deducted before conversion. THB fees are deducted last. Negative proceeds are rejected. Enter a fee once only; a spread already in the quote must not be counted again.
For help choosing inputs, read the worked guide for this calculation.
Primary reference: Bank of Thailand: daily foreign exchange rates
Checked 23 October 2026 · Source date: daily series; no value copied.
Primary reference link only