Which counting system does this use?

It uses the everyday Tagalog cardinal numbers (isa, dalawa, tatlo) with the Spanish-derived scale words libo (thousand), milyon (million), and bilyon (billion). This is the form used on Filipino cheques and formal documents rather than the older pure-Spanish counting.

What does lamang at the end mean?

Lamang means only or nothing more. Like and no more on an English cheque or لا غير in Arabic, it marks the written amount as complete and final so the figure cannot be altered.

How are the centavos handled?

The amount is multiplied by 100 and rounded to whole centavos to avoid floating-point drift, then split into piso and sentimo. So 1250.75 yields exactly 1250 piso and 75 sentimo, with the sentimo phrase added only when it is greater than zero.

Why is it dalawang libo and not dalawa libo?

Tagalog inserts the linker -ng or na between a number and the noun it counts. Words ending in a vowel take -ng (dalawang libo), so the counting word attaches smoothly to libo, daan, or piso.

Does it run privately in my browser?

Yes. All number spelling and rounding happen locally in JavaScript using Tagalog number tables. Nothing you type is uploaded, logged, or stored.

Filipino Currency in Words

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Peso amounts, written out in Tagalog

Formal Filipino documents — cheques, contracts, official receipts — require the amount in words alongside the figures. This tool turns a plain decimal peso amount into correct Tagalog phrasing, spelling out both the piso and the sentimo and closing with the customary “lamang.”

How it works

The amount is first converted to whole centavos to avoid binary floating-point error: it is multiplied by 100 and rounded, then split into a major piso part and a minor sentimo part.

total_centavo = round(amount × 100)
piso          = floor(total_centavo / 100)
sentimo       = total_centavo mod 100

Each part is spelled with the standard Tagalog number engine. Numbers below 20 use the labing- teens, tens combine with units using the “‘t” linker (dalawampu’t lima = 25), and hundreds use “daan” with the -ng linker (dalawang daan = 200). Scale groups attach libo, milyon, and bilyon. The piso phrase and, when present, the sentimo phrase are joined with “at” (and), and “lamang” (only) is appended.

Tips and example

An amount like 1250.75 becomes “Isang libo dalawang daan at limampu’t piso… at pitumpu’t limang sentimo lamang.” Whole amounts drop the sentimo clause entirely. Because the conversion rounds to the nearest centavo, you never see a stray hundredth introduced by floating-point math. For spelling Indonesian or Malay amounts, see the related currency-in-words tools.