The Open Source Calculation Library

The Swiss Army Knife of conversions. Instantly convert Length, Weight, Volume, and Temperature between US Imperial and Metric systems.

Estimate your weekly, fortnightly, or monthly take-home pay under the new 2024-2025 Revised Stage 3 tax cuts.

Check your Body Mass Index (BMI) instantly. Supports both Metric (cm/kg) and Imperial (ft/lbs) units with accurate health categories.

Visualize the power of compound interest with monthly contributions. See how small savings grow into massive wealth over time.

Plot multiple linear equations (y=mx+b), find intersection points, and calculate x/y intercepts instantly with interactive graphs.

Calculate exactly how many survey responses you need for statistically significant results. Supports finite population correction.

The only percentage tool you need. Calculate percentage increases, find parts of a whole, and solve ‘X is what percent of Y’ problems instantly.

Interactive 3D Surface Grapher. Visualize Paraboloids, Hyperboloids, Torus knots, and Spheres in real-time.

Plot and analyze Quadratic, Cubic, and Quartic functions. Automatically calculates vertex and roots for parabolas.

Estimate your Capital Gains Tax (CGT) on cryptocurrency trades in Australia. Includes 2024-2025 tax brackets and the 50% long-term holding discount.