About MatStack
Interpolate Hub is founded by MatStack, a small indie company that builds focused tools for people who work with numbers. We keep products small on purpose: one clear job, no accounts, and no advertising in the way of the math. Interpolate Hub is our suite of interpolation and numerical calculators—everything runs in the browser so your data never leaves your machine. MatStack exists to ship practical engineering utilities that stay fast, private, and free to use. If you want to reach the people behind the site, use our contact page.
Engineering Precision with Zero Latency
Interpolate Hub was built to solve a persistent annoyance: bloated, ad-ridden online calculators that send user coordinates to remote servers, lag on mobile devices, and choke when entering numbers with European comma decimals.
Our Core Principles
100% Client-Side Execution
Every calculation runs entirely in your local browser using modern web standards. Your data never touches a backend server, guaranteeing absolute privacy and zero network delay.
Transparent Step-by-Step Math
A black-box calculator is useless when you need to verify an engineering calculation or submit homework. We show every intermediate variable, formula substitution, and arithmetic step.
International Number Accessibility
Whether you type 1.5 or 1,5, our unified decimal parser interprets your inputs correctly without throwing syntax errors or misplacing decimal points.
Clean, Distraction-Free Design
No pop-up overlays, no intrusive advertisements, and no tracking scripts. Just fast, dependable mathematical utilities styled according to modern engineering ergonomic standards.
The Tool Suite
Interpolate Hub provides 10 purpose-built calculators covering numerical methods, geometry, statistics, and industrial process control:
- Linear Interpolation Calculator: Estimate intermediate values along a straight line connecting two known data points.
- Bilinear / Double Interpolation Calculator: Calculate values on a 2D regular grid using successive linear interpolations in two directions.
- Lagrange Interpolation Calculator: Find the unique polynomial of degree ≤ n-1 passing through n given distinct coordinate points.
- Percentile Interpolation Calculator: Calculate exact percentiles from empirical datasets using linear rank interpolation methods.
- Logarithmic Interpolation Calculator: Interpolate values on semi-logarithmic or log-log scales for exponential or power decay curves.
- Extrapolation Calculator: Project trends and estimate values outside the range of your observed boundary points.
- Slope Calculator from Two Points: Compute slope, angle of inclination, grade percentage, distance, and line equation (y = mx + b).
- 4-20mA Scaling & Current Loop Calculator: Convert between process variable (PV), transmitter current (mA), and span percentage (0-100%).
- Median of Grouped Data Calculator: Estimate the median of frequency distribution tables using class interval interpolation.
- Linear Regression Calculator: Fit an optimal straight line y = mx + b to paired data with R², correlation r, and predictions.
Open Educational Mission
Interpolate Hub is offered free of charge as an open educational reference for engineers, students, data scientists, researchers, and field technicians around the world.
If you have feedback, questions about a specific formula, or suggestions for additional numerical utilities, please reach out via our contact page.