Free tools
Billing calculators that show their work
Each tool runs in your browser, explains the formula and walks through an example. Your numbers never leave the page.
MRR and ARR calculator
Turn plans, seats and billing periods into monthly and annual recurring revenue.
Churn and retention calculator
Customer churn, retention, annualised churn plus net and gross revenue retention.
LTV calculator
Customer lifetime value, LTV to CAC ratio and CAC payback in months.
GST invoice calculator
Split an amount into taxable value, CGST and SGST or IGST, inclusive or exclusive.
Discount and proration calculator
Apply percent or flat discounts, prorate part-periods and price mid-cycle plan changes.
Billing cycle date calculator
List upcoming invoice dates for daily, weekly, monthly and yearly cycles.
Invoice number format generator
Design a sequential invoice numbering scheme and check it against the 16 character GST limit.
Per-seat tier pricing calculator
Compare graduated and volume per-seat pricing for any number of seats.
Payment terms due date calculator
Find the due date for immediate, Net 15, Net 30 and Net 60 terms.