TetraKits
US sales tax varies by state and city. The TetraKits sales tax calculator adds tax to net prices or extracts tax from receipt totals — with presets for CA, NY, TX, FL, and WA.
Overview
- Tax = net × (rate ÷ 100)
- Gross = net × (1 + rate ÷ 100)
- Net from gross = gross ÷ (1 + rate ÷ 100)
Add vs remove tax
Add tax: You have a shelf price (net). Enter it + rate → read gross and tax amount.
Remove tax: You have a receipt total (gross). Enter it + rate → read net and tax extracted.
Example: $100 net + 8.25% → $8.25 tax, $108.25 gross.
State presets
| Preset | Approx. rate |
|---|---|
| California | 7.25% |
| New York | 8% |
| Texas | 6.25% |
| Florida | 6% |
| Washington | 6.5% |
Local surtaxes may apply — enter a custom rate for your city. For European tax, use the VAT calculator.
FAQ
Are presets exact?
State-level averages. Local rates can add 1–3%+ in some cities.
Remove tax from a receipt?
Net = gross ÷ (1 + rate/100).
Sales tax vs VAT?
Sales tax is US checkout tax by locality. VAT is invoice tax common in Europe.
Is this calculator free?
Yes. Unlimited, browser-based, no signup.
