Everyday Tools — Unit Converter, Date Difference, Age & Exam Score Calculator
Fast, accurate calculators for everyday tasks — unit conversion, date math, age, and the grade you need on the final exam.
Everyday tools
Unit Converter
Length, weight, volume, temperature and more, at lightning speed.
Date Calculator
Add days to any date, or find the exact time between two dates.
Final Grade Calculator
Find out exactly what you need on the final to hit your target grade.
Age Calculator
Exact age in years, months and days from any two dates.
Why these tools?
- Pure math, no hidden assumptions — conversions use the exact SI factors.
- Density mode for cooking: grams ↔ cups for real ingredients.
- Business-day aware date math — skips weekends when you need the working-days count.
- No sign-up, no data leaves your browser.
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Frequently Asked Questions
How accurate are the unit conversions?
Exact — we use the official SI definitions (1 kg = 2.20462262185 lb, 1 mi = 1.609344 km, etc.). Temperature conversions also use the exact formulas, not approximations.
Which date format do the date tools accept?
Both — the underlying inputs are real date pickers, so you never have to worry about DD/MM vs MM/DD. Displayed dates follow your selected locale.
Do you store my data?
No. Everything runs in your browser.