Free Online Calculators
Calculate percentages, dates, time, work hours, discounts, measurements and more — instantly and for free. Every result comes with the formula and steps so you can see how it was calculated.
No calculator matches that. Try a word like “percent”, “date”, “hours” or “area”.
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Popular calculators
See all 12 →- Percentage Calculator Six percentage calculations in one place, each with the formula and the steps. Math
- Age Calculator Exact age in years, months and days — plus totals and your next birthday. Time & Date
- Work Hours Calculator Hours worked from clock-in to clock-out, with breaks and overnight shifts. Time & Date
- Percentage Increase Calculator Measure the increase or decrease between two values, in either direction. Math
- Date Calculator Days between two dates, or add and subtract days, weeks, months and years. Time & Date
- Tip Calculator Tip, total and the per-person split, with the cents adding up exactly. Everyday
Browse by category
- Math Percentages, percentage change and fractions — the everyday arithmetic people look up most. 3 calculators
- Time & Date Ages, date differences, durations and timesheets, with leap years handled properly. 4 calculators
- Everyday Tips, discounts and sales tax — the quick sums you do in a shop or at a restaurant table. 2 calculators
- Construction Square footage and concrete volume for real projects, in both imperial and metric units. 2 calculators
- Design & Tech Aspect ratios and screen dimensions for video, photography and web design. 1 calculator
Built for clear answers
Calquly is built to make everyday calculations quick and easy to understand. Use a calculator instantly, see the answer, and check the formula and working behind it when you want to know how it was calculated.
Everything runs directly in your browser, so your calculations stay on your device and the tools remain useful even when your connection is unreliable.