Bill calendar: plan bills and pay days so you never run short

Guide · Updated 2026-11-10

Learn how a monthly bill calendar with a running balance shows money gaps early, with a worked example and common mistakes.

Open the Bill calendar Free, in your browser, nothing uploaded.

A bill calendar puts every payment and every pay day on the day it happens, and then keeps a running balance. It is for anyone whose money is enough in total but tight in the middle of the month: renters, students, people paid every two weeks, and families sending money home. The monthly totals come from the budget planner; if a loan is the biggest bill, see how extra payments help in the loan payoff planner.

What it is

A budget answers “do I earn enough?”. A calendar answers a different question: “will I have enough on each day?” That is called cash flow, the timing of money coming in and going out.

The tool keeps one number for each day, the running balance:

balance after today = balance before today + money in today − money out today

You type what is in your account on one date. Every bill, repeat and pay day after that moves the balance up or down. The lowest value in the month is the number to watch. If it is below zero, you will be short on that day even though the month as a whole adds up.

Repeats save typing. A bill can repeat every week, every two weeks, every month, every three months or every year, and can have an end date. A bill on the 31st falls on the last day of shorter months.

How to use it

1. Press + Add, choose Bill or expense or Income, then give it a name, an amount, a category and the first date.
2. Pick how it repeats. Add an Until date for things that end, such as a phone contract.
3. Open Balance, currency and your data. Type the money in your account and the date it was counted. Choose your currency; it changes only how amounts look.
4. Look at the summary for the month and the lowest balance. Days below zero turn red.
5. Click a bill to mark it paid, skip one date, edit or delete it. Use Calendar or List view as you like.
6. Download the month as an image, PDF or Word file, or the bills as a CSV file. Tick Remember my calendar on this device only if you want it kept in this browser.

A worked example

Take made-up numbers in dollars. You have $600 on the 1st. You are paid $1,000 every two weeks, on the 5th and the 19th. Your bills are rent $800 on the 3rd, phone $40 on the 10th, electricity $90 on the 12th and internet $60 on the 20th.

Day by day, the balance is:

• 3rd: 600 − 800 = −$200 (red)
• 5th: −200 + 1,000 = $800
• 10th: 800 − 40 = $760
• 12th: 760 − 90 = $670
• 19th: 670 + 1,000 = $1,670
• 20th: 1,670 − 60 = $1,610

Over the month the money is plenty: $2,000 in and $990 out. But the calendar shows a $200 hole on the 3rd, because rent lands two days before pay. You now have choices before it happens: ask to move the rent date, keep $200 aside from last month, or shift another bill. A budget total would never have shown this.

Where it is used

• Households. Pay days, rent, subscriptions and school fees on one page.
• Students. Grants and part-time pay arrive on odd days, and rent does not wait.
• Small businesses and freelancers. Invoices arrive late and suppliers want paying. A calendar shows how long cash will last.
• Families sending money abroad. A “Family back home” category keeps these payments visible next to everything else. Check the official source for transfer fees and limits in your country.

Common mistakes

• Leaving out small repeats. Weekly groceries and yearly fees add up. Enter them once with a repeat.
• Forgetting to update the balance. The running balance is only as good as the starting number. Re-enter your real balance now and then.
• Counting pay that is not certain. If pay can be late, add it on the safe date, or check how the month looks without it.
• Not marking bills paid. The “still to pay” total only helps if you tick what is done.
• Clearing the browser and losing the data. Download a backup file if you keep the calendar for long.

Questions people ask

Does it show interest or fees? No. It shows only the amounts you type. If a late fee applies, add it as a bill.

What if I skip a bill for one month? Open that date and press Skip this date. The repeat carries on afterwards.

Is this financial advice? No. It is a planning aid. For rules about tax, credit or fees, check the official source for your country.