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Scientific Calculator

Advanced math functions including trig, log, and exponents.

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Fraction Calculator

Add, subtract, multiply, and divide fractions.

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Percentage Calculator

Calculate percentages, percent change, and proportions.

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Random Number

Generate random numbers within a specific range.

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Triangle Calculator

Solve sides, angles, area, and perimeter of a triangle.

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Standard Deviation

Calculate population and sample standard deviation.

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Quadratic Equation Solver

Calculate roots and discriminant of a parabola.

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Ratio Calculator

Simplify, scale, and solve for missing terms.

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Probability Calculator

Calculate single/combined events and permutations.

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Matrix Calculator

Add, subtract, and multiply 2x2 and 3x3 matrices.

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LCM & GCF Calculator

Find lowest common multiple and greatest common factor.

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Exponent & Log Calculator

Calculate exponents, roots, and logarithms.

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Mortgage Calculator

Estimate monthly mortgage payments with amortization.

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Loan Calculator

Calculate personal loan payments and total interest.

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Investment Calculator

Project future value of investments over time.

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Income Tax Calculator

Estimate your income tax based on brackets.

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Currency Converter

Convert between world currencies with recent rates.

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Discount Calculator

Calculate percent off, final price, and amount saved.

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Tip Calculator

Calculate tip percentage and per-person bill split.

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VAT Calculator

Add or remove VAT with country presets.

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Break-Even Calculator

Calculate units needed to break even.

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Net Worth Calculator

Calculate assets minus liabilities to find net worth.

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EMI Calculator (India)

Calculate EMI for loans with Indian rupee formatting.

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GST Calculator (India)

Calculate GST with standard Indian tax slabs.

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Income Tax (US)

Estimate US federal income tax with 2024 brackets.

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VAT Calculator (UK)

Calculate UK VAT with standard and reduced rates.

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BMI Calculator

Calculate your Body Mass Index (BMI).

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Calorie Calculator

Estimate daily calorie needs for weight goals.

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Water Intake Calculator

Calculate daily recommended water intake.

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TDEE Calculator

Calculate Total Daily Energy Expenditure.

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One-Rep Max Calculator

Estimate maximum lifting capacity (1RM).

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Age Calculator

Calculate exact age in years, months, and days.

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Password Generator

Generate secure, random passwords.

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Bill Splitter

Split bills unevenly with itemized tracking.

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Roman Numeral Converter

Convert between decimal numbers and Roman numerals.

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Base Converter

Convert between binary, hex, decimal, and octal.

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Word & Character Counter

Count words, characters, and sentences in text.

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QR Code Generator

Generate downloadable QR codes from text or URLs.

Use QR Code Generator→

Why use Flash calculator ⚡?

1

100% Free Forever

No signups, no paywalls, no hidden fees. All tools are completely free to use.

2

Lightning Fast

Calculations run instantly in your browser. No waiting for server responses.

3

Privacy First

Your data never leaves your device. Everything is computed locally.