API Pricing Calculator

Use it when your task matches one of these common needs: Estimate API cost before launching a feature, automation, or internal workflow. Compare pricing plans with the same request and billable-unit assumptions. It works best when you already know the text, code, URL, mode, format, or technical setting the page asks for.

In plain language: Billable units = requests * units per request * (1 + retry or overhead percent / 100). Usage cost = billable units * price per unit. Total cost = usage cost + fixed fee. Average cost per request = total cost / requests. The examples on the page are there so you can compare your inputs with a filled-out example before copying the answer.

Requests: The number of API calls, jobs, messages, images, events, or tasks you want to estimate. Units per request: How many billable units each request uses, such as tokens, images, seconds, messages, credits, or GB. Price per unit: The cost for one billable unit. Convert provider prices to one unit before entering them. Fixed fee: An optional monthly fee, minimum charge, platform fee, or other fixed cost to include in the total. Retry or overhead percent: Extra cushion for retries, failed jobs, logging overhead, queue replays, or normal usage bursts.

Read the output next to your original input. If the tool changes format, units, encoding, spacing, or capitalization, compare a small sample before copying the whole result into another app.

This is provider-neutral planning math, not a live bill. Provider billing can include free tiers, regional prices, taxes, credits, minimums, tiered prices, currency conversion, rounding, rate limits, failed-call rules, batch discounts, or special plan terms that this calculator does not know. Also check the selected mode, input format, encoding, and whether the text includes private keys, passwords, or sensitive data.

A billable unit is whatever the provider charges for: one request, one image, one minute, one message, one credit, one GB, or one token. Use the unit from that provider price table.

If a model price is listed per 1 million tokens, divide that price by 1,000,000 to get the price per token, or use the AI Token Cost Calculator for the token-specific version.

Divide the listed price by the number of units in that price. A $2 price per 1 million units becomes $0.000002 per unit. A $0.50 price per 1,000 units becomes $0.0005 per unit.

Use fixed fee for a monthly platform fee, minimum spend, support fee, base subscription, or other cost that does not change with request count. Leave it at 0 when the provider only charges for usage.

Use 0 when you only want exact planned requests. Add 3% to 10% when retries, failed calls, background jobs, logs, or normal traffic bursts are likely. Use a higher value only when your own logs justify it.

No. It uses one price per unit for the whole estimate. If a provider has a free tier, volume discounts, or tiered pricing, run the paid and free portions separately or use the blended unit price you trust.

Yes. Keep requests, units per request, fixed fee, and overhead the same, then swap the price per unit. That compares cost only, not rate limits, latency, support, reliability, or data retention rules.

No. The calculator only needs pricing numbers. Do not paste API keys, customer records, private payloads, or unreleased usage logs into the input fields.

No. The tool runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.