Free & Open Source Online Tool to Calculate the Rule of Three. Easily calculate the unknown value in a proportion, helping you with math, science, and everyday calculations.

Free & Open Source Online Tool to Calculate Averages. Easily compute the mean, median, and mode of a set of numbers. Useful for data analysis, statistics, and quick calculations in various fields.

Free & Open Source Online Tool to Calculate Markup and Selling Price. Easily determine the markup percentage or selling price based on cost and desired profit, helping businesses make informed pricing decisions.

Free & Open Source Online Tool to Calculate Debt-to-Income (DTI) Ratio. Easily determine your DTI ratio by comparing your monthly debt payments to your monthly income, helping you assess your financial health and borrowing capacity.

Free & Open Source Online Tool for Length Conversion. Easily convert between various units of length such as meters, feet, inches, kilometers, and miles, helping you with quick and accurate measurements for any project or calculation.

Free & Open Source Online Tool to Calculate Value Added Tax (VAT). Easily determine the VAT amount based on the price and VAT rate, helping you understand the tax implications of your purchases.

Free & Open Source Online Tool to Calculate Grade Scales. Easily determine letter grades based on percentage scores, helping students understand their academic performance better.

Free & Open Source Online Tool to Calculate Return on Ad Spend (ROAS). Easily determine the effectiveness of your advertising campaigns by calculating the revenue generated for every dollar spent on ads.

Free & Open Source Online Tool to Calculate Discounts. Easily compute the final price after applying discounts to original prices, helping you save money and make informed purchasing decisions.

Free & Open Source Tool to Calculate Cost per Thousand Impressions (CPM). Easily compute and analyze advertising costs based on impressions for digital marketing campaigns.

Free & Open Source Tool to Calculate Gross Profit Margins. Easily compute selling prices, costs, and gross profit margins for business and financial analysis.

Free & Open Source Tool for Calculating Trade Returns. Analyze profit/loss, ROI, and other key metrics for various trading scenarios.

Free & Open Source Tool for Calculating and Simplifying Ratios. Compare quantities, find equivalent ratios, and solve ratio-related problems easily.

Free & Open Source Tool for Various Percentage Calculations. Calculate percentages, find percentage of a number, compute percentage change, and more.

Free & Open Source Number Sum Calculator Online