Does this calculator include holidays?

No. It only skips Saturdays and Sundays when you choose to skip weekends. If your terms specify business days that exclude holidays, you should still manually adjust the result for any holidays that fall in the period.

Is the start date counted as day 1 or day 0?

The calculator starts counting from the day after your start date, which is how many billing and notice periods are defined. If your terms treat the start date as day 1, you can subtract one day from the result or test with small day counts to match your policy.

Can I use this to set legal or compliance deadlines?

It can help you understand approximate timelines, but legal and regulatory deadlines can have very specific definitions for business days, mailing dates, and holidays. Always confirm important deadlines with a legal professional or by referencing the exact statute or contract language.

time calculator

Bill Due Date Calculator

Add days to a start date and optionally skip weekends to find a due date.

Results

Due year: 2024.00
Due month: 2.00
Due day: 12.00

How to use this calculator

Enter the start year, month, and day for when the period begins—for example, the date an invoice is issued or a notice is mailed.
Enter the number of days until the bill is due. This might be a net-30 invoice, a 10-day grace period, or a custom billing term.
Choose whether to skip weekends. Select “Yes” to count only business-style days (Mon–Fri) or “No” to include all calendar days.
Run the calculation to see the resulting due year, month, and day.
Optionally, repeat with different day counts or weekend rules to compare calendar-day vs business-day due dates.

Inputs explained

Start year / month / day: The calendar date you want to start counting from. This could be the date a bill is generated, the date a package ships, or the date a task is assigned. The calculator treats the next day as day 1 when adding days.
Days until due: How many days you are allowed before payment or completion is due. For example, 30 for a net-30 invoice, 14 for a two-week response period, or 7 for a one-week deadline.
Skip weekends?: Choose “Yes” to count only Monday through Friday toward the due date, treating Saturday and Sunday as non-business days. Choose “No” to count every calendar day, including weekends.

How it works

You enter a calendar start date (year, month, day) and the number of days until the bill or task is due.

If you choose to include weekends, we simply move forward that many calendar days starting the day after the start date.

If you choose to skip weekends, we step forward one day at a time and only count Monday through Friday toward the total, ignoring Saturdays and Sundays.

As we iterate, we take care of month lengths and year changes for you, so you do not have to worry about how many days are in each month or what happens at year-end.

The final result is returned as a due year, due month, and due day that you can match to a calendar, billing system, or reminder app.

Formula

Conceptually, the calculator:\n\n1. Starts from the calendar date you provide.\n2. Moves forward one day at a time.\n3. If skipWeekends = Yes, only counts days that fall Monday–Friday toward the total; otherwise, every day counts.\n4. Stops when the desired number of counted days has been reached and returns that date as the due date.

When to use it

Setting invoice due dates—such as net-15 or net-30 terms—while choosing whether to land on business days only.
Planning internal task deadlines that avoid weekends so work lands on business days when your team is available.
Estimating reply-by dates for notices, letters, or compliance timelines that are defined in days.
Coordinating bill payments with payday cycles by seeing exactly which date a due date will fall on.

Tips & cautions

If your contracts or policies specify business days, use the weekend-skipping option to reflect that, then manually adjust for holidays if needed.
When in doubt about whether the start date counts as day 0 or day 1, run a couple of small examples (like 1 or 2 days) and compare to your billing policy.
For recurring bills, run the calculator once to understand the pattern, then use a calendar or budgeting tool to set repeating reminders.
If your due date lands on a weekend but your provider only processes payments on weekdays, consider paying on the prior business day to be safe.
The calculator does not automatically account for holidays, bank closures, or jurisdiction-specific non-business days—only weekends when you choose to skip them.
It assumes whole-day steps and does not handle cut-off times within a day (for example, 5 p.m. same-day posting deadlines).
Results are provided as numeric date parts; you may still want to cross-check unusual edge cases around leap years or end-of-month transitions on a calendar.

Worked examples

Example 1: Net-30 including weekends

You issue an invoice on March 1 and set Days until due = 30 with weekends included.
The calculator moves forward 30 calendar days from March 1.
The due date falls around March 31, depending on the year and month length.

Example 2: 10 business days, skipping weekends

A notice is mailed on April 3 and the recipient has 10 business days to respond.
You set the start date to April 3, Days until due = 10, and choose to skip weekends.
The calculator counts only Monday–Friday, skipping Saturdays and Sundays, and returns the corresponding business-day due date later in April.

Example 3: Comparing business days vs calendar days

You want to understand the difference between 14 calendar days and 10 business days for a compliance timeline.
First, you run 14 days with weekends included and note the due date.
Then, you run 10 days with weekends skipped and compare how far apart those dates are for your specific start date.

Deep dive

Use this bill due date calculator to add a set number of days to a start date and optionally skip weekends so you can land on a clear due date for invoices, notices, and tasks.

Enter the start date, days until due, and whether to skip weekends to quickly see when a payment, response, or project milestone should be completed.

Perfect for freelancers, small business owners, accounts receivable teams, and anyone who needs to translate terms like net-30 or 10 business days into an exact calendar due date.

FAQs

Does this calculator include holidays?: No. It only skips Saturdays and Sundays when you choose to skip weekends. If your terms specify business days that exclude holidays, you should still manually adjust the result for any holidays that fall in the period.
Is the start date counted as day 1 or day 0?: The calculator starts counting from the day after your start date, which is how many billing and notice periods are defined. If your terms treat the start date as day 1, you can subtract one day from the result or test with small day counts to match your policy.
Can I use this to set legal or compliance deadlines?: It can help you understand approximate timelines, but legal and regulatory deadlines can have very specific definitions for business days, mailing dates, and holidays. Always confirm important deadlines with a legal professional or by referencing the exact statute or contract language.

Related calculators

time

Pay Period Count Calculator

Count pay periods between two dates for weekly, biweekly, semi-monthly, or monthly schedules.

finance

Escrow Shortage Calculator

Spread an escrow shortage over months and see the adjusted escrow payment.

This bill due date calculator is a convenience tool for estimating due dates by adding calendar days or business-style days that skip weekends. It does not account for holidays or jurisdiction-specific rules and is not legal, accounting, or compliance advice. For critical deadlines or formal notices, always confirm dates with your provider, institution, or a qualified professional.