Free Online Calculators
Simple, accurate calculators for everyday math — percentages, age, BMI, and more. No signup, no download.
Percentage Calculator
Calculate percentages, percentage change, add or remove percentages — 4 modes in one tool.
→Age Calculator
Calculate exact age in years, months, days, hours and weeks. Find your next birthday too.
→BMI Calculator
Calculate your Body Mass Index using metric or imperial units. Includes BMI category chart.
→Tip Calculator
Calculate tip amount and split the bill between any number of people.
→Loan Calculator
Calculate monthly loan payments, total interest, and amortization schedule.
→Compound Interest
See how investments grow over time with compound interest and regular contributions.
→Date Calculator
Calculate the difference between two dates or add/subtract days, weeks, and months.
→GPA Calculator
Calculate your GPA for any semester with custom credit hours and grade scale.
→Dice Roller
Roll any number of dice with any sides — D4, D6, D8, D10, D12, D20 and custom.
→Discount Calculator
Find sale price, savings, or what percentage off something is — 3 modes in one.
→Calorie Calculator
Calculate your BMR and daily calorie needs (TDEE) based on stats and activity level.
→Simple Interest Calculator
Calculate interest earned and total amount using the simple interest formula I = Prt.
→Mortgage Calculator
Calculate monthly payment, total interest, and year-by-year amortization for any home loan.
→Aspect Ratio Calculator
Find a ratio from dimensions, scale images proportionally, or pick from common presets.
→Countdown Timer
Count down to any event, holiday, or deadline. Also includes a precision stopwatch.
→About Our Online Calculators
Mental math is fast for simple problems, but calculators eliminate the risk of error when precision matters. Whether you're working out a tip, checking how much a price has changed, or tracking your health metrics, having an accurate tool at hand saves time and reduces mistakes.
All ToolFlash calculators run entirely in your browser. Nothing is sent to a server, there's no account to create, and results appear instantly as you type. Each calculator is designed for a single, clear purpose — no clutter, no unnecessary steps.
Which calculator do you need?
Percentage Calculator — Useful for calculating discounts, tax, tips, grade changes, and any situation where exact percentages matter. The Age Calculator returns results in years, months, days, and weeks — useful when you need more than just the year difference. The BMI Calculator includes the full WHO category table so you understand what your number means.
Advertisement