Utility & Calculators Tools
Free utility tools and calculators. Generate passwords, UUIDs, and hashes, convert units and colors, calculate age, BMI, mortgage, GPA, percentages, and tips — instantly.
38 free tools · 100% browser-based · No signup
Password Generator
Generate strong passwords. Customize length, character types, exclude ambiguous chars. Strength meter. Bulk generate.
UUID / GUID Generator
Generate v4 UUIDs in bulk (1-1000). Toggle uppercase, hyphens. Copy individual or all.
Hash Generator (MD5, SHA)
Generate MD5, SHA-1, SHA-256, SHA-512 hashes. File hashing support. Compare two hashes for verification.
Unit Converter
Convert length, weight, temperature, speed, data storage, time, area, volume, pressure, energy between 100+ units.
Color Converter (HEX/RGB/HSL)
Convert colors between HEX, RGB, HSL, CMYK. Live color preview swatch. Copy any format instantly.
Percentage Calculator
6 calculator modes: X% of Y, what percent, percent change, add/subtract %, tip calculator, and discount calculator.
Age Calculator
Calculate exact age with zodiac signs, birthday countdown, life milestones, and fun facts like heartbeats and breaths.
BMI Calculator
Calculate BMI with metric/imperial toggle. Visual gradient scale, healthy weight range, BMI Prime, and calculation history.
Mortgage Calculator
Calculate mortgage payments with amortization schedule. Compare loan scenarios, see affordability, export to CSV.
Compound Interest Calculator
Calculate compound interest with monthly contributions. Growth charts, year-by-year breakdown, Rule of 72, inflation adjustment.
Tip Calculator & Bill Splitter
Calculate tips and split bills among friends. Quick presets, round options, per-person breakdown, service guide.
Date Difference Calculator
Calculate days between dates, add/subtract time, count business days. Quick presets and fun facts included.
Scientific Calculator
Full scientific calculator with trig, log, exponents, memory, factorial. Keyboard support and calculation history.
Discount Calculator
Calculate discounts, savings, final prices. Stack multiple discounts, bulk pricing table, reverse calculator, compare deals.
GPA Calculator
Calculate semester and cumulative GPA. Add courses with grades and credits. Target GPA calculator. Save semesters.
Random Number Generator
Generate truly random numbers in any range. Single or bulk, unique-only, sorted, up to 10,000 at a time.
Grade Calculator
Calculate your weighted course grade and letter grade. Add unlimited assignments with custom weights.
Concrete Calculator
Calculate concrete volume and bag count for slabs, footings, and columns. Imperial and metric units, 10% waste factor included.
Ovulation Calculator
Predict your ovulation date, fertile window, and next period from your last menstrual period and cycle length.
Body Fat Calculator
Estimate your body fat percentage using the US Navy circumference method. Imperial or metric.
Dog Age Calculator
Convert dog years to human years using a modern size-adjusted formula. Small to giant breeds supported.
Tile Calculator
Calculate exactly how many tiles and boxes you need for any room. Imperial or metric, with adjustable waste factor.
Paint Calculator
Calculate exactly how many gallons or liters of paint you need for any room. Adjusts for doors, windows, and number of coats.
Sleep Calculator
Find the best time to go to sleep or wake up based on 90-minute sleep cycles.
Time Card Calculator
Calculate weekly work hours and gross pay from clock-in / clock-out times. Includes unpaid breaks and overtime.
Time Zone Converter
Convert any time between two time zones instantly. Handles DST automatically.
Roman Numeral Converter
Convert between numbers and Roman numerals (1–3999).
Loan Calculator
Calculate monthly payment, total interest, and total cost for any loan.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine.
Number to Words Converter
Spell out any number in words — perfect for cheques and contracts.
Length Converter
Convert between meters, feet, inches, miles, kilometers, and more.
Weight Converter
Convert between kilograms, pounds, ounces, grams, and stone.
Speed Converter
Convert between mph, km/h, m/s, knots, and ft/s.
Volume Converter
Convert between liters, gallons, cups, mL, and more.
Area Converter
Convert between square feet, meters, acres, hectares.
Fuel Economy Converter
Convert between MPG, L/100km, and km/L.
Time Unit Converter
Convert between seconds, minutes, hours, days, weeks, months, years.
Days Between Dates Calculator
Calculate days, weeks, months, and years between two dates.
Popular in Utility & Calculators
The most-used tools in this zone — start here if you're not sure where to begin.
- Password Generator Generate strong passwords. Customize length, character types, exclude ambiguous …
- UUID / GUID Generator Generate v4 UUIDs in bulk (1-1000). Toggle uppercase, hyphens. Copy individual o…
- Hash Generator (MD5, SHA) Generate MD5, SHA-1, SHA-256, SHA-512 hashes. File hashing support. Compare two …
- Unit Converter Convert length, weight, temperature, speed, data storage, time, area, volume, pr…
- Color Converter (HEX/RGB/HSL) Convert colors between HEX, RGB, HSL, CMYK. Live color preview swatch. Copy any …
- Percentage Calculator 6 calculator modes: X% of Y, what percent, percent change, add/subtract %, tip c…
About Utility & Calculators Tools
Free utility tools and calculators. Generate passwords, UUIDs, and hashes, convert units and colors, calculate age, BMI, mortgage, GPA, percentages, and tips — instantly. Every tool on this page runs 100% in your browser — your files, text, and data never leave your device. No signup, no API keys, no upload limits.
Why use BreezyTools for utility & calculators?
BreezyTools offers 38 free utility & calculators tools alongside other tools across 15 categories. Everything is fast, private, and free forever — no premium tier, no ads in your face, no tracking your inputs. Browse the full tool catalog or jump to another category from the footer below.
Frequently asked questions
Are these utility & calculators tools really free?
Yes. Every utility & calculators tool on BreezyTools is 100% free with no signup, no usage limits, and no premium tier.
Do you store the data I enter?
No. All tools run entirely in your browser. Your inputs never leave your device — there's no server processing your data.
Can I use these tools commercially?
Yes. BreezyTools is free for personal, educational, and commercial use with no licensing restrictions.