Resources
Everything for billing a recurring business
Guides, free calculators and templates. No sign-up, no email gate. The calculators run in your browser and nothing you type is sent anywhere.
Guides
Learn the concepts, then see how they play out.
Free tools
Nine calculators with the formula and a worked example on each 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.
Downloadable templates
Plain CSV and Markdown files. Open them in any spreadsheet or text editor.
CSV
Customer import sample
The exact columns Knock's customer import reads (name and email are required), with one clearly labelled sample row to delete.
CSV
Pricing worksheet
Work out price, margin, GST-inclusive price, seats and projected MRR for a plan. Open it in any spreadsheet app.
Markdown
Invoice checklist
What to check before, on and after sending an invoice, including GST fields.
Markdown
Month-end close checklist
Billing, payments, receivables, tax and metrics steps for closing the month of a subscription business.
Get started
Ready to move off spreadsheets? Start here.