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The completecalculator library

52 precision calculators for math, finance, health, and everyday life — all powered by a single BigNumber engine. No signup, no clutter, instant answers.

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52
Calculators
6
Categories
128-bit
Precision
100%
Always Free
52 calculators
Math

Basic Calculator

Simple everyday arithmetic — add, subtract, multiply, divide with a retro LCD display.

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LCD
Math

Scientific Calculator

Advanced scientific calculator with trigonometry, logarithms, powers, and constants.

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LCD
Math

Percentage Calculator

Calculate percentages: what is X% of Y, percentage change, and more.

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FORM
Math

Fraction Calculator

Add, subtract, multiply, divide fractions. Simplify and convert to decimals.

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Math

Area Calculator

Calculate area of rectangles, circles, triangles, trapezoids, and ellipses.

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Math

Volume Calculator

Calculate volume of cubes, spheres, cylinders, cones, and pyramids.

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Math

Quadratic Equation Solver

Solve ax² + bx + c = 0. Find roots, discriminant, and vertex.

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FORM
Math

Statistics Calculator

Calculate mean, median, mode, standard deviation, and variance from a data set.

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Math

GCD & LCM Calculator

Find the Greatest Common Divisor and Least Common Multiple of two or more numbers.

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Math

Number Base Converter

Convert between binary, octal, decimal, and hexadecimal number systems.

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Math

Exponent Calculator

Calculate powers, roots, and exponential expressions.

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Math

Permutation & Combination

Calculate permutations (nPr) and combinations (nCr) with factorial support.

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Math

Ratio Calculator

Simplify ratios, find equivalent ratios, and solve proportions.

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Math

Logarithm Calculator

Calculate natural log (ln), common log (log₁₀), and log with custom base.

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Finance

Loan EMI Calculator

Calculate monthly EMI, total interest, and payment schedule for any loan.

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Finance

Compound Interest Calculator

Calculate compound interest with flexible compounding frequencies.

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Finance

Simple Interest Calculator

Calculate simple interest: I = P × R × T.

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Finance

SIP Calculator

Systematic Investment Plan calculator — project your wealth growth over time.

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Finance

Tip Calculator

Calculate tip amount and split bills between multiple people.

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FORM
Finance

Discount Calculator

Calculate discount amount, final price, and savings.

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FORM
Finance

Profit Margin Calculator

Calculate gross profit margin, net margin, and markup percentage.

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FORM
Finance

ROI Calculator

Calculate Return on Investment with gain/loss analysis.

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FORM
Finance

Salary Calculator

Convert between hourly, daily, weekly, monthly, and annual salary.

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Finance

Mortgage Calculator

Calculate monthly mortgage payments, total interest, and amortization.

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Finance

Inflation Calculator

Calculate the effect of inflation on purchasing power over time.

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Finance

Break-Even Calculator

Find the break-even point — units and revenue needed to cover costs.

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Finance

Savings Goal Calculator

How much to save monthly to reach your financial goal.

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Finance

Currency Converter

Convert between major world currencies with approximate exchange rates.

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Health & Fitness

BMI Calculator

Calculate Body Mass Index with health category classification.

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Health & Fitness

Calorie & TDEE Calculator

Calculate your Basal Metabolic Rate and Total Daily Energy Expenditure.

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FORM
Health & Fitness

Body Fat Calculator

Estimate body fat percentage using the US Navy method.

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Health & Fitness

Ideal Weight Calculator

Find your ideal weight range using multiple scientific formulas.

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Health & Fitness

Water Intake Calculator

Calculate daily water intake based on weight, activity, and climate.

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Health & Fitness

Heart Rate Zone Calculator

Calculate your target heart rate zones for optimal training.

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Health & Fitness

Macronutrient Calculator

Calculate daily protein, carbs, and fat intake based on your goals.

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Health & Fitness

Pregnancy Due Date Calculator

Estimate pregnancy due date and track trimester milestones.

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FORM
Date & Time

Age Calculator

Calculate exact age in years, months, and days from your birth date.

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Date & Time

Date Difference Calculator

Find the exact difference between two dates in days, weeks, months, and years.

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Date & Time

Time Calculator

Add or subtract hours, minutes, and seconds.

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Date & Time

Countdown Calculator

Count days until a future event — birthday, holiday, deadline.

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Conversion

Length Converter

Convert between meters, feet, inches, miles, kilometers, and more.

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Conversion

Weight Converter

Convert between kilograms, pounds, ounces, grams, and stones.

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FORM
Conversion

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin.

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FORM
Conversion

Speed Converter

Convert between km/h, mph, m/s, knots, and more.

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Conversion

Data Storage Converter

Convert between bytes, KB, MB, GB, TB, and PB.

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Conversion

Energy Converter

Convert between joules, calories, kWh, BTU, and more.

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Conversion

Cooking Converter

Convert between cups, tablespoons, teaspoons, ml, liters, and ounces.

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Everyday Tools

GPA Calculator

Calculate your Grade Point Average from courses and credits.

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FORM
Everyday Tools

Random Number Generator

Generate random numbers within a specified range.

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LCD
Everyday Tools

Password Generator

Generate strong, secure passwords with customizable options.

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FORM
Everyday Tools

Word & Character Counter

Count words, characters, sentences, and paragraphs in your text.

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FORM
Everyday Tools

Color Converter

Convert between HEX, RGB, and HSL color formats with live preview.

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FORM
Custom builder

Need something specific?

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