Calculators
About the Month Calculator
The Month Calculator is a free online calculator from Toolbench. Months between two dates, or a date plus N months. Enter your numbers and the answer — with the formula used — updates as you type.
- Category
- Calculators
- Price
- Free
- Account
- Not required
- Runs
- Entirely in your browser
How to use the Month Calculator
- Enter the values (calculate, start date, end date, months to add (negative to subtract)).
- Read the result — it updates as you type.
- Check the breakdown rows to see exactly how it was calculated.
Worked example
| Calculate | Months between dates |
|---|---|
| End date | 2027-12-31 |
| Months to add (negative to subtract) | 6 |
| Months | 15.13 |
| Exact | 15 months, 4 days |
| Years, months, days | 1y 3m 4d |
| Total days | 460 |
Formula: Months between two dates count whole calendar months; adding months keeps the same day of the month, clamped to the month’s last day (Jan 31 + 1 month = Feb 28/29).
Inputs
| Calculate | Months between dates · Add or subtract months |
|---|---|
| Start date | Date (defaults to today) |
| End date | Default: 2027-12-31 |
| Months to add (negative to subtract) | Default: 6 |
Privacy
Everything runs in your browser: what you type or paste is processed by JavaScript on your device, not on a server. If you are signed out, nothing is saved at all. If you sign in with Google, your inputs and settings are saved privately to your account so they sync across devices.
Frequently asked questions
Is the Month Calculator free?
Yes. Month Calculator is completely free with no sign-up, no usage limits and no watermarks.
Is my data private?
Yes. The Month Calculator processes everything in your browser. Signed out, nothing is saved; signed in, your inputs sync privately to your own account.
How does the month calculation work?
Months between two dates count whole calendar months; adding months keeps the same day of the month, clamped to the month’s last day (Jan 31 + 1 month = Feb 28/29).
Does it work on my phone?
Yes. Toolbench runs in any modern browser on desktop, tablet or phone — there is nothing to install.
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