VAT calculator
Add VAT to net price, or remove VAT from gross price

VAT / sales tax

If the VAT rate is 20%, gross = net × 1.20. If you only know gross, net = gross ÷ 1.20.

Fill inputs, then click Calculate.
Notes
  • This is a simple calculator for inclusive/exclusive VAT. It doesn’t handle tiered taxes or invoice rounding rules.
  • For negative rates, or rates near -100%, results may be undefined.
About / 關於

VAT calculator — Add VAT to net price, or remove VAT from gross price. Shows net, VAT amount, gross, and the multiplier. Shareable, browser-only MVP.

Example: Use this tool to sanity-check numbers quickly, then share the link if you need to discuss with others.

FAQ: (1) Does it upload my data? No—runs in your browser. (2) Can I share results? Yes—use the share link feature. (3) Is it authoritative? Treat it as a convenience, not professional advice.

VAT（加值稅）計算器 — 未稅/含稅怎麼換算？輸入金額與稅率，一鍵加 VAT 或去 VAT；顯示未稅、稅額、含稅與倍率。可分享連結、純前端 MVP。

範例：用這個工具快速試算與對照結果，需要討論時再把連結分享給對方。

FAQ： (1) 會上傳資料嗎？不會，計算在瀏覽器內完成。 (2) 能分享結果嗎？可以，用分享連結。 (3) 準確嗎？請把它當作便利工具，不是專業建議。