How to Create Invoices from Google Calendar Events

If you’re a consultant, coach, therapist, or any service professional who bills by appointment, you know the monthly drill: open your calendar, count sessions for each client, then create invoices one by one. It’s tedious, time-consuming, and prone to errors.

What if your calendar could simply be your invoices?

Meet Sofia

Sofia is a psychotherapist in Amsterdam with a busy practice. She sees about 30 clients per week, offering both individual and couples therapy sessions at different rates.

Every month, Sofia faces the same task: review her calendar, count sessions per client, and create 25–30 invoices manually. Between checking appointment histories, calculating quantities, and entering data, it eats nearly two hours.

And she’s not alone. Whether you’re a yoga instructor in Rome, a business coach in Paris, or a piano teacher in Vienna, if you bill by appointment, you’ve felt this.

Who This Helps

This feature is built for anyone who bills by session or appointment:

• Consultants — strategy sessions, advisory calls, project meetings
• Coaches — life, business, career
• Therapists & psychologists — individual and group sessions
• Tutors & teachers — language, music, academic tutoring
• Personal trainers — one-on-one and group classes
• Healthcare professionals — physiotherapy, massage, alternative medicine
• Legal advisors — consultation hours
• Nutritionists & dietitians — client consultations

If you schedule appointments in Google Calendar and need to invoice for those sessions, this saves hours every month.

How It Works

Haiku.lt’s calendar integration converts your Google Calendar events into invoices automatically. The logic is simple:

• Each unique event title becomes one client invoice.
• The number of appointments becomes the quantity.
• Buyer details (email, country, tax ID, language, price) are pre-filled from previous invoices for that name.
• You review and adjust everything before anything is created.

What used to take Sofia two hours now takes ten minutes.

What You Need

• A Haiku.lt account (free up to 500 invoices)
• A Google Calendar with your appointments — use client names as event titles
• Google Calendar permission (granted when you sign in with Google)

Haiku.lt does not store calendar data. Event titles and dates are read temporarily only when you run the wizard — your calendar stays private.

When It’s Not the Right Fit

• Highly variable per-session pricing with no historical pattern — you’ll spend more time correcting the review screen than entering invoices by hand.
• Inconsistent event titles (e.g. mixing “Marie Dubois” and “Marie D.”) — you’ll get split invoices unless you tidy your calendar first.
• Very low volume (fewer than 3–4 sessions per month) — manual entry is genuinely faster.

For most appointment-based businesses doing 10–100+ sessions per month, this is the difference between a Monday morning and a half-day of admin.

How to Set It Up

Open Haiku.lt and click Create from Calendar on your dashboard — a four-step wizard handles calendar selection, date range, invoice configuration, and review. Full walkthrough with screenshots: Bulk-create invoices from Google Calendar.

After creation, the Multi-Edit wizard takes over for sending, locking, and tracking payment in bulk — see Send invoices and save PDFs to Google Drive.

Ready to Try It?

Existing users: sign in and click “Create from Calendar” on your dashboard.

New users: sign up free at haiku.lt — 500 invoices on the free plan is plenty to test this on real client data.

Questions? Email dalius.dobravolskas@gmail.com.

Next time the monthly invoicing task looms, remember: your calendar is already done. Just convert it.