Category
Calculators
Everyday calculators — BMI, percentage, age, tip, date diff.
24 free calculators tools — no sign-up, runs in your browser.
BMI Calculator
Compute Body Mass Index from height and weight in either metric or imperial units.
Percentage Calculator
Compute percent of a number, the percentage one number is of another, and percentage change.
Age Calculator
Compute your age in years, months, and days from a date of birth — plus total days lived.
Date Difference Calculator
Compute the difference between two dates in years, months, days, hours, minutes, seconds.
Tip Calculator
Calculate tip and split a restaurant bill across any number of people.
Timezone Converter
Convert a time from any timezone to any other — Central to Pacific, UTC to Tokyo, you name it.
Aspect Ratio Calculator
Compute aspect ratios and resize dimensions while preserving the original proportion — 16:9, 4:3, 21:9 and more.
Bytes Converter
Convert between bytes, KB, MB, GB, TB and their binary counterparts KiB, MiB, GiB, TiB.
Length Converter
Convert between metric and imperial length units — mm, cm, m, km, inches, feet, yards, miles.
Weight Converter
Convert between metric and imperial weight units — mg, g, kg, tonnes, ounces, pounds, stone, US tons.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin and Rankine using the exact formulas, not approximations.
Speed Converter
Convert between m/s, km/h, mph, knots and ft/s — covers driving, flying, sailing and physics units.
Volume Converter
Convert between mL, L, cubic meters, US fluid ounces, cups, pints, quarts, and gallons (US + Imperial).
Coin Flip
Flip a virtual coin once or hundreds of times — cryptographically random, fair 50/50 odds.
Dice Roller
Roll d4, d6, d8, d10, d12, d20 or d100 dice — D&D notation like 3d6+2 supported via the modifier field.
Random Picker
Pick random items from a list — names, options, prizes. Cryptographically fair, with or without duplicates.
Stopwatch (Duration Calculator)
Format, add, or subtract durations like '1:23:45' or '1h 30m'. Heads up — this is a calculator, not a live stopwatch.
Countdown Timer (Time Until)
Calculate how much time until a date — days, hours, minutes, seconds. Heads up: it's a calculator, not a live ticking countdown.
Pomodoro Timer (Schedule Calculator)
Plan a pomodoro study session — how many cycles, work + break minutes, total time. It's a planner, not a ticking timer.
Compound Interest Calculator
Project savings/investment growth with compound interest — set principal, annual rate, years, compounding frequency and optional monthly contribution.
Loan & Mortgage Calculator
Compute monthly payment, total interest, and the amortization schedule for any fixed-rate loan or mortgage.
Discount Calculator
Compute the sale price after a percent discount — supports stacked discounts and an optional sales-tax / VAT addition.
Salary Converter
Convert between hourly, daily, weekly, biweekly, monthly and annual salary — adjust hours/week and weeks/year.
VAT / Sales Tax Calculator
Add VAT/sales tax to a net amount, or extract VAT from a gross amount — also derives the tax portion as a standalone figure.
Frequently asked
Are Toolsly calculators free?
Yes. BMI, percentage, age, tip, date-difference and all other calculators are free and unlimited.
Are calculations done locally?
Yes. Calculators run in your browser — no input is sent to any server.
Can I use the calculators offline?
Yes. Once the page is loaded, calculators work without an internet connection.