| What it does | Time duration calculator for hours, minutes, and dates
| Free EZ grader chart and easy grade calculator for teachers and students
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Calculate elapsed time between two times or dates
- Handle shifts that cross midnight
- Support for multiple time formats: h:mm:ss, decimal hours, and total minutes
- Account for daylight saving time with timezone selection
- Add up to 20 time spans together
- Run calculations in browser with no data storage
- Pre-calculated common work shifts for reference
- Calculate hours worked with unpaid break deductions
- Show results in multiple formats for different use cases
| - Instant Quick Grade & EZ Grader Test Chart
- Customizable Standard and Plus/Minus Grading Scales
- Weighted Course Grade & Final Exam Simulator
- Printable & Downloadable PDF Grading Charts
- Offline PWA Utility Support
- GPA calculations for semester and cumulative grades
- Grade curve calculator with multiple curving methods
- CGPA to percentage converter for 25 universities
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| What makes it different | - All calculations verified against 100+ automated tests before each release
- Handles edge cases like midnight crossings, month-end dates, and daylight saving
- Built by a single developer who personally checks every result
- No server storage or tracking of user inputs
- Comprehensive methodology page explains all calculation rules
| - Free with no sign-up required
- Calculations run entirely in your browser with no data uploaded
- Works offline as a Progressive Web App
- Print charts or save as PDF without site navigation
- Transparent mathematical formulas documented and tested for accuracy
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| Community votes | 0 | 0 |
| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | Not checked yet ● no change since last check |
| Trust Flow (Majestic) | 1 | 0 |
| Citation Flow (Majestic) | 18 | 17 |
| Referring domains (Majestic) | 2 | 3 |