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Utilities Calculators Comparison

Compare Utilities calculators side by side. Free utility calculators — QR codes, password strength, color converters, unit helpers and other handy everyday tools.

Utilities Calculators

QR Code Generator

Generate QR codes for any text or URL

Password Generator

Generate strong passwords

Color Converter

Convert between HEX, RGB, HSL

Universal Unit Converter

Convert between any units

Number Base Converter

Convert between binary, decimal, hex

Hash Generator

Generate SHA-256 hash

Lorem Ipsum Generator

Generate placeholder text

UUID Generator

Generate UUID v4

Bill Split & Tip

Split bill and calculate tip

Countdown Timer Calculator

Calculate time until a future event

File Size Converter

Convert file size units (B, KB, MB, GB)

Salary to Hourly Converter

Convert annual salary to hourly rate

Area Calculator

Calculate area of common shapes

Volume Calculator

Calculate volume of 3D shapes

Shipping Cost Calculator

Estimate shipping costs by weight and distance

Biweekly Pay Calculator

Calculate biweekly pay from annual salary

Take-Home Pay Calculator

Gross → net pay after federal, FICA and state tax

Mileage Reimbursement Calculator

Calculate mileage reimbursement at IRS rate

Ratio Simplifier

Simplify and work with ratios

GCD & LCM Calculator

Greatest common divisor and least common multiple

Prime Number Checker

Check if a number is prime and find factors

Rounding Calculator

Round numbers to a specified precision

Coin Flip Simulator

Simulate coin flips with statistics

Dice Roll Simulator

Roll dice and analyze the results

Date Add/Subtract

Add or subtract days from a date

Exact Age Calculator

Exact age in years, months, and days

Price Per Unit Calculator

Compare prices per unit to find the best deal

Random Team Generator

Split names into random teams

Password Entropy Calculator

Strength in bits from length and character pool

Speech Time Calculator

Speaking duration from word count and pace

QR Version Finder

Smallest QR version that fits your byte payload

Unix Timestamp Converter

Epoch seconds to readable UTC date

About CalcProMaster calculators

CalcProMaster is a free library of 1206 online calculators across 20 categories — finance, health, math, business, construction, engineering, conversion, education and more. Every calculator runs entirely in your browser: no sign-up, no paywall, and no data leaves your device.

What makes these calculators different is transparency. Each tool shows the exact formula it uses and a step-by-step breakdown of how your inputs become the result, so you can verify the math instead of trusting a black box. Result interpretation, common mistakes, assumptions and limitations are documented on every calculator page, alongside worked examples and an FAQ. Health and finance tools cite the standard formulas they follow — Mifflin-St Jeor for calorie needs, standard amortization for loans — and state plainly where a calculator's answer should be confirmed with a professional.

The guides library goes deeper on the calculations people search for most: percentage and discount math, loan EMI and amortization, income-tax brackets, calorie and macro planning, concrete volumes and more — each with the formula, worked examples and links to the matching calculator. The glossary defines the terminology in plain language, and the public formula QA dashboard shows the verification status of every calculator's math.

Popular starting points: loan EMI calculator, BMI calculator, percentage calculator, random number generator, and concrete calculator — or browse a category above to find the tool you need.

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