Free billing calculators
Free calculators that go with our guides: proration, SaaS metrics and invoice due dates. They run in your browser and send nothing anywhere.
- Proration Calculator Work out the credit for the unused part of the old plan, the charge for the new plan and the net amount when a customer changes plans partway through a billing period.
- MRR, Churn and Retention Calculator Enter one period's recurring revenue movements and customer counts to get ending MRR, revenue churn, net and gross revenue retention, and customer churn with its annual equivalent.
- Invoice Due Date Calculator Pick an invoice date and payment terms such as net 30 to see the due date and weekday, plus the deadline and amount of an early-payment discount if you offer one.