| What it does | Date, deadline and time calculators with visible assumptions and sources
| 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 | US
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - 184 calculators across 53 categories
- Shows counting rules and assumptions with each result
- Local-first processing with no data sent to servers
- Holiday and weekend calendar selection
- Business day counting
- Date arithmetic (add or subtract days, weeks, months, years)
- Sleep cycle planner with NIH-based 80-100 minute cycles
- Time zone conversion with DST handling
- Save results as images or add to calendar
- Schengen visa 90/180 day rolling window auditing
| - 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 | - Shows the source and counting rule beside every answer
- No sign-up or account required to use any calculator
- All inputs stay in your browser for privacy
- Comprehensive coverage across 53 life and work categories
- Higher-risk calculators include prompts to verify with professionals
| - 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 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 0 | 0 |
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| Citation Flow (Majestic) | 0 | 17 |
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| Referring domains (Majestic) | 0 | 3 |
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CalcSpan
Easy Grade Tool