How Kalyvor keeps your files private
Encryption in transit, immediate deletion and what browser-side processing actually means.
4 min read
Date & time calculatorsFreeFast
Time Duration Calculator
The elapsed time between two clock times — hours and minutes, with overnight spans handled automatically. Instant, in your browser.
- instantaverage
- In-browserprocessing
- Zerouploads
- Runs in your browser
- Nothing is uploaded
- No signup required
Kalyvor
Time Duration Calculator
Date & time calculators
Time Duration Calculator
Inputs
Start time
End time
Your result appears here.
Ready to generate
Choose your options and press Calculate.
People also use
Tools that pair well with this one, or do the job from the other direction.
Why Kalyvor
Built for people who value their time
Every date & time tool is fast, private and genuinely free — no dark patterns, no surprises.
Fast cloud processing
Jobs run on dedicated workers and finish in seconds — no queue, no spinner you can go make coffee to.
Auto file deletion
Everything you upload is erased the moment the job finishes. Nothing is written to long-term storage, so there is no retention period to wait out.
Works everywhere
Desktop, tablet or phone, any modern browser. Nothing to install, no plugins, no extensions.
Batch processing
Drop in a folder's worth of files and run the whole set through one tool in a single pass.
Privacy first
Encrypted in transit, never used to train models, never sold. Many tools never send the file at all.
No installation
Open a tab and go. No account needed to start, no download, no licence key to hunt for.
How it works
Time Duration Calculator in three steps
No account, no installation, no manual. It takes about as long to do as it does to read.
- 01
Enter the start time
Any clock time.
- 02
Enter the end time
Earlier than the start time is treated as the following day, not an error.
- 03
Read the elapsed time
Hours and minutes, plus total minutes, total seconds and decimal hours — updated instantly.
Questions
Frequently asked questions
Everything worth knowing before you run your first Time Duration Calculator job. Still stuck? Talk to support.
Helpful articles
Guides and walkthroughs for getting more out of Time Duration Calculator.
Batch processing: run 100 files at once
A practical walkthrough of queueing large jobs without babysitting the tab.
6 min read
Choosing the right tool for the job
A short decision guide for when two tools look like they do the same thing.
5 min read
Getting started with Kalyvor
From first upload to finished download in under a minute — the whole flow.
3 min read
Explore more Calculators tools
Search 153 productivity tools and get the whole job done in one tab — no installs, no account, no upsell at the finish line.
- instant average
- Secure processing
- No sign-up
- Free to start