| What it does | Browser-based grade calculator for weighted course grades, final planning, and GPA estimates
| Time duration calculator for hours, minutes, and dates
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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 weighted course grades from multiple assignments and assessments
- Support for multiple grade formats including percentages, letter grades, and points
- Final exam score planning to reach a target grade
- Customizable letter grade scales for different schools and instructors
- Display both raw and weighted grade averages
- Support for semester, quarter, and high school grades
- GPA point calculations with letter-grade conversion
- No account required to use calculators
- Browser-based access with save functionality
| - 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
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| What makes it different | - Handles partial course weights that do not add up to 100 percent
- Distinguishes between raw averages and weighted averages to show individual assignment impact
- Automatically converts between percentages, points, and letter grades using customizable scales
- Estimates the exact final exam score needed to achieve a target grade
- Works without requiring account creation or login
| - 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
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 8 ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 8 | 1 |
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| Citation Flow (Majestic) | 25 | 18 |
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| Referring domains (Majestic) | 16 | 2 |
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GradeCal
Timespanly