16 Free Online Tools

Calculators

Perform everyday calculations instantly. From percentages and fractions to BMI and speed-distance formulas, all calculations run client-side in real-time.

Math

5 tools

Math 100% Private

Percentage Calculator

Calculate percentage of a number, percentage change, and relative percentage values.

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Math 100% Private

Percentage Increase Calculator

Calculate the percentage growth from an original value to a higher new value.

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Math 100% Private

Percentage Decrease Calculator

Calculate the percentage drop or reduction between an original and a lower value.

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Math 100% Private

Ratio Calculator

Simplify ratios, find equivalent ratios, and solve for unknown values in proportions (A:B = C:D).

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Math 100% Private

Fraction Calculator

Add, subtract, multiply, and divide fractions with step-by-step reduction and decimal conversion.

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Time & Date

2 tools

Time & Date 100% Private

Age Calculator

Calculate exact age in years, months, days, hours, and minutes with next birthday countdown.

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Time & Date 100% Private

Date Difference Calculator

Calculate the total days, weeks, and months between two dates.

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Statistics

1 tools

Statistics 100% Private

Average Calculator

Calculate mean, median, mode, range, geometric mean, and sum of a set of numbers.

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Shopping & Sales

1 tools

Shopping & Sales 100% Private

Discount Calculator

Calculate sale prices, total dollar savings, and additional stacked discounts.

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Business & Finance

3 tools

Business & Finance 100% Private

Profit & Loss Calculator

Calculate total profit or loss, profit percentage, and net return from cost and selling price.

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Business & Finance 100% Private

Margin Calculator

Calculate gross profit margin, revenue, cost, and gross profit.

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Business & Finance 100% Private

Markup Calculator

Calculate selling price and profit from cost and desired markup percentage.

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Health & Fitness

1 tools

Health & Fitness 100% Private

BMI Calculator

Calculate Body Mass Index (BMI) for adults using Metric or US Imperial measurements.

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Physics & Travel

1 tools

Physics & Travel 100% Private

Speed, Distance & Time Calculator

Calculate speed, distance, or travel time from any two known variables.

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Travel & Automotive

1 tools

Travel & Automotive 100% Private

Fuel Cost Calculator

Estimate gas trip costs based on trip distance, fuel economy, and gas prices.

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Education

1 tools

Education 100% Private

GPA Calculator

Calculate cumulative semester Grade Point Average (GPA) from letter grades and credit hours.

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Frequently Asked Questions about Calculators

Are the calculations processed on your server?

No. All calculations are executed directly inside your web browser using client-side JavaScript. None of your numbers or inputs are sent to any remote server.

How accurate are the mathematical formulas?

Our calculators use IEEE 754 standard double-precision floating-point arithmetic with tailored rounding precision to prevent typical floating-point display artifacts.