| What it does | Time duration calculator for hours, minutes, and dates
| Find the score you need on your final exam to reach your target course grade
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| Pricing model | Free
| Free
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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
| - Apply formula: Required = (Goal - Current × (1 - Weight)) ÷ Weight
- Weighted grade calculator for multiple categories
- GPA calculator from letter grades and credits
- Grade converter between percentage and letter grade
- Test grade calculator from correct answers
- Cumulative GPA calculator across multiple terms
- All calculations run in browser without sign-up
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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
| - Instantly shows if your target grade is reachable from the final exam alone
- Works for any grading setup with fixed final exam weight
- Completely free with no sign-up required
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | 2 ● no change since last check |
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| Trust Flow (Majestic) | 1 | 3 |
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| Citation Flow (Majestic) | 18 | 24 |
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| Referring domains (Majestic) | 2 | 33 |
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Timespanly
Final Grade Calculator