---
title: "US Sales Tax Calculator (by State) + Reverse"
method: POST
path: "/api/v1/tools/sales-tax-calculator"
tags: ["business"]
---

# US Sales Tax Calculator (by State) + Reverse

`POST /api/v1/tools/sales-tax-calculator`

## Request

- Base URL: `https://calcfleet.com`
- URL: `https://calcfleet.com/api/v1/tools/sales-tax-calculator`
- Auth: none declared

Calculate US sales tax by state. Add or strip tax from any price. Select a state to prefill the rate; all 50 states included. 2025 base rates — local rates vary

## Request body

- object
  - `mode` 'forward' | 'reverse', required
  - `amount` number, required
  - `ratePct` number, required

## Response `200`

Successful calculation result.

- object
  - `result` object, required: Structured calculation output (fields vary per calculator).

## Other responses

- `400`: Invalid input — the issues array contains Zod validation errors.
- `403`: Forbidden — an Authorization: Bearer cf_… key was supplied but is invalid.
- `404`: Unknown tool slug.

---

[API](https://skmtc.dev/calcfleet/apis/calcfleet-financial-calculators-api.md) · [All operations](https://skmtc.dev/calcfleet/apis/calcfleet-financial-calculators-api/llms.txt) · [OpenAPI document](https://skmtc.dev/calcfleet/apis/calcfleet-financial-calculators-api/revisions/cd9abd595bbe?raw)