Free billing calculator
What should this month's bill be?
Combine a subscription, included usage, overage, and credits. Change the numbers, see the calculation, and share the example with your team. No signup required.
Build a billing example
Use sample numbers. Calculations run in your browser; no account required.
Changes the currency label; no exchange-rate conversion.
The fixed subscription fee.
Usage covered by the base fee.
Total usage during one billing period.
Flat overage rate, up to six decimal places.
Applied up to the subtotal. Any remainder is shown separately.
Illustrative monthly bill · USD
Every line, explained
- Base subscription
- $99.00
- Extra units (2,400)
- $24.00
- Subtotal
- $123.00
- Credit applied
- −$20.00
Estimated total before tax
$103.00
12400 used − 10000 included = 2,400 extra units (minimum zero). Multiply by 0.01 USD per unit, then round the usage line to cents.
One billing period, one flat overage rate. Taxes, tiered rates, proration, payment fees, and production invoice rules are outside this example.
No credit card required. Configure your pricing in the workspace; calculator values are not imported automatically.
From one example to recurring billing
This calculator shows the arithmetic for one flat overage model. Floatless connects pricing to customers, subscriptions, usage records, credits, and invoice review in a billing workspace.