33 free tools — no signup, no paywalls
Analyze your data in seconds — no Excel, no Python
Calculators and data tools for analysts, founders, and finance professionals. Drop a file, enter a number, get the answer.
Data Analysis
View allDashboard Design System
Build dashboard wireframes with KPI templates for executives, managers, and analysts. Drag chart blocks, add real data, export as PNG. For product teams and BI developers.
Data Visualization Guide
Master data storytelling. Learn the 4 data relationships, chart selection framework, accessibility principles, and when to use Excel vs Tableau vs Python. Interactive recommender tool included.
Data Quality Framework
Standardize your data quality process. Learn the 6 dimensions of data quality (accuracy, completeness, consistency, timeliness, validity, uniqueness), source-specific validation, ETL pipeline checks, and GDPR compliance. Reduce cleaning time from 80% to 20%.
Data Governance Tool
Build audit-ready data governance. Auto-generate data dictionaries with schema, data types, sample values, and compliance metadata. Master GDPR Article 30, SOC 2, and ISO 27001 requirements. For data teams and compliance officers.
Finance
View allSalary Calculator
Convert between annual, monthly, weekly, and hourly salary. Instant breakdown.
Compound Interest Calculator
See how your investment grows over time with compound interest. Year-by-year breakdown.
Profit Margin Calculator
Calculate gross, net, and operating profit margin. Includes markup vs margin explanation.
Break-Even Calculator
Find the exact units or revenue needed to cover your costs. With break-even chart.
VAT Calculator
Add or remove VAT from any price. Supports custom rates and all major country rates.
Rent vs Buy Calculator
Compare 10-year wealth, break-even point, and monthly costs for renting vs buying. Supports UK, US, Canada, Australia and more.
Investment Growth & Inflation Calculator
See how your investments grow in real terms after inflation. Nominal vs real value, purchasing power chart, year-by-year breakdown.
Debt Avalanche vs Snowball Calculator
Enter all your debts and compare avalanche vs snowball payoff strategies. See interest saved, payoff timeline, and debt-free date.
Business
View allMath
View allPercentage Calculator
Calculate percentages, percentage change, and what percent one number is of another.
Random Number Generator
Generate random numbers in any range. Single number, list, or unique set — no repeats.
Standard Deviation Calculator
Paste a list of numbers and get mean, median, mode, variance, and standard deviation instantly.
Correlation Calculator
Enter two sets of numbers and calculate Pearson correlation coefficient with interpretation.
Sample Size Calculator
Calculate the required sample size for any survey or experiment. Set confidence level and margin of error.
Mean, Median & Mode Calculator
Enter a list of numbers and calculate mean, median, mode, range, and sum instantly.
Guides & Articles
View allDeep-dive guides and walkthroughs to help you make better financial decisions. Learn the math, formulas, and real-world considerations behind every calculator.
Rent vs Buy Calculator Guide
Complete breakdown of all costs, formulas, and decision factors. See real examples from UK, US, Canada, and Australia.
Debt Payoff Strategies
Understand avalanche vs snowball methods, interest calculations, and how to become debt-free faster.
Investment Growth & Inflation
Learn real vs nominal returns, how inflation destroys purchasing power, and why investment horizon matters.
The 5% Rule for Rent vs Buy
A simple mental math test to know immediately if buying makes financial sense in your market. Quick screening tool.
How Inflation Destroys Investment Returns
Understand real vs nominal returns. Your 8% returns are only 5% after inflation. Protect your wealth.
Dashboard Design System
Build effective data dashboards with KPI templates, layouts for executives and analysts, and anti-patterns to avoid.
Data Visualization Guide
Master data storytelling. Learn the 4 data relationships, chart selection framework, and when to use Excel vs Tableau vs Python.
Data Quality Framework
Standardize data quality. Learn the 6 dimensions, source-specific validation, ETL pipeline checks, and compliance for analytics teams.
Data Governance Tool
Master data governance, GDPR compliance, data catalogs, and audit-ready documentation. For compliance officers and data teams.