Calculators
Calculators, Ready To Use
Dates, loans, percentages, units, number bases, and more — all in your browser.
Date Difference
Count calendar days, weeks, and remaining days between two dates.
DaysWeeksInclusive option
Age Calculator
Calculate exact age in years, months, days, and total days at any reference date.
Exact ageAs of dateTotal days
Percentage Calculator
Solve percentage of, percentage change, increase, decrease, and final value problems.
ChangeIncreaseDecrease
Loan Calculator
Estimate monthly payments, total interest, payoff totals, and an annual amortization snapshot.
PaymentsInterestAmortization
Unit Converter
Convert length, weight, temperature, and digital storage units.
LengthWeightTemp
Number Bases
Convert numbers between binary, octal, decimal, and hexadecimal.
BinaryHexLive
Roman Numerals
Convert Arabic numbers and Roman numerals from 1 to 3999.
↔ Both waysClassic
Aspect Ratio
Calculate pixel height from width and ratio (e.g. 16:9).
16:9PixelsLayout
Free Online Calculators
Quick calculators for dates, age, percentages, loans, and everyday math helpers.
How to use
- 1Choose a calculator. Select the calculator that matches your question.
- 2Enter values. Fill in dates, amounts, or rates.
- 3Read the breakdown. Copy results for reports or planning.
FAQ
- Are calculator results financial advice?
- No. Loan and percentage results are estimates for planning only.
- Do calculators work on mobile?
- Yes. All calculators are responsive and work in modern mobile browsers.