Mathematics
Percentage calculator
Calculate percentage increase, decrease, parts and totals.
Online calculators
The right calculator, without wasting time
Describe what you want to calculate or choose a popular tool. Calculations are free and run directly in your browser.
Popular searches
Search runs in your browser and does not send your entered values.
Browse another way
Use the categories or the full catalog if search is not enough.
Quick tools
Popular calculators
Open the most requested tools directly for common calculations.
Dates and time
Age calculator
Calculate age in years, months and days, plus the next birthday.
Dates and time
Date difference calculator
Count days, weeks, months and years between two dates.
Health
BMI calculator
Estimate body mass index from height and weight.
Mathematics
Scientific calculator
Evaluate scientific expressions, powers, roots and trigonometry.
Education
Grade calculator
Calculate simple averages, weighted grades and final exam needs.
Needs
Browse by category
Start from your need: mathematics, conversions, dates, work, energy, health or education.
- MathematicsPercentages, statistics, scientific calculation and random numbers.
- ConversionsLength units and practical conversions.
- Dates and timeAge, dates, durations and hours.
- Work and salaryWork hours, salary conversion and gross pay estimates.
- EnergyElectricity usage, kWh costs and appliance comparisons.
- HealthGeneral estimates for BMI, calories and cycles.
- EducationGrades, weighted averages and exam goals.
Trust
Simple calculations, without unnecessary collection
Numerava favors static calculators, clear explanations and preferences stored locally.
- FreeNo account is required to run a calculation.
- LocalCalculation values stay in your browser.
- MultilingualPages keep their URLs, formats and reading direction.
- Explained methodsPages describe formulas, units, rounding and useful limits.
- Local privacyCalculations run in the browser, without a user account.
Need another tool?
The catalog groups every available calculator with its category.
My favorite calculators
Your choices are saved only in this browser.
Favorites stay on this device and are not sent to a server.
You have not saved any calculator yet.
Favorites cannot be saved in this browser.
Quick questions
FAQ
Are the calculators free?
Yes. Available calculators can be used without registration.
Are entered values sent to a server?
Calculations run in the browser. Local preferences stay on the device.
Do health calculators replace medical advice?
No. They only provide general estimates.