Calculators
Answer quick numeric questions without a spreadsheet. Each calculator explains its result so you can double-check the maths.
Age & date difference calculator
Calculators
Work out exact age or the gap between two dates
Unit converter
Calculators
Convert length, weight, temperature and 15 more unit categories
Percentage calculator
Calculators
12 percentage modes: increase, discount, tax, tips, grades and more
Loan & EMI calculator
Calculators
Loan, mortgage and EMI payments with a full amortisation schedule
Compound interest calculator
Calculators
Savings and investment growth with contributions, taxes and inflation
BMI & body metrics calculator
Calculators
BMI, body fat, BMR, TDEE, ideal weight and more — not medical advice
Why run calculators in the browser?
Most online tools work by uploading your file to a server, processing it there and handing back a download link. That means a copy of your document exists on someone else's machine, at least for a while.
Every tool in this category avoids that entirely. The processing code is downloaded to your browser and your file is read locally, so the work is faster, private by default, and keeps working even when your connection drops.