API Pricing Calculator

Estimate your monthly and yearly API bill

Most API providers price in one of two ways: a flat rate per call, or a rate per 1,000 calls, often layered on top of a base subscription fee that includes a bundle of free calls. This calculator does the math for you. Enter your expected call volume, choose whether your rate is quoted per call or per 1,000 calls, and add any base plan fee and included-call allowance. Only the calls above your allowance are billed as overage — exactly how most usage-based plans work.

The results update live: total monthly cost (base fee plus usage), the yearly cost at twelve months, how many of your calls are actually billable, and your effective cost per 1,000 calls — the single best number for comparing plans that are priced differently. Everything runs in your browser; nothing is uploaded or stored.

Estimates only — not professional or financial advice; provider rates, tiers, and fees vary and change often.

How to use it

1. Enter the number of API calls you expect to make per month.
2. Pick how your rate is quoted — per call or per 1,000 calls — and enter the price.
3. Add your monthly base or plan fee, if any.
4. Enter the calls included in that plan; only calls beyond it count as billable overage.
5. Read your monthly and yearly totals, plus the effective cost per 1,000 calls.

FAQ

My provider prices per token or per request unit, not per call. Can I still use this?

Yes. Treat one call as whatever unit your provider bills — a request, a token bundle, a lookup. As long as your volume and price use the same unit, the math is identical.

What is the effective cost per 1,000 calls?

It is your total monthly bill divided by all the calls you make, times 1,000 — what you truly pay once fixed fees and allowances are blended in, making differently structured plans directly comparable.

How is overage calculated?

The calculator subtracts your included-call allowance from your monthly volume. Anything left over is billed at your entered rate; if you stay under the allowance, usage cost is zero and you only pay the base fee.

Does this handle tiered or volume-discounted pricing?

Not automatically. If your provider drops the rate at higher volumes, enter your blended average rate, or run the calculator once per tier and add the results.