All your calculators, one place
35free online calculators covering everyday maths, personal finance, health & fitness, and advanced science — all running instantly in your browser with no sign-up required.
Everyday
Quick answers for the decisions you face every day — from splitting a bill to converting units.
Finance
Plan smarter with tools for loans, investments, retirement, and taxes.
Health & Fitness
Track your body metrics and plan workouts with science-backed formulas.
Math & Science
From simple arithmetic to symbolic calculus, linear algebra, and interactive graphing.
About MyFreeOnlineCalculator
MyFreeOnlineCalculator is a free, ad-supported collection of 35 online calculators built to cover the most common real-world calculation needs — from splitting a restaurant bill to modelling a retirement nest egg, computing symbolic derivatives, and plotting interactive graphs of arbitrary mathematical functions. Every tool runs entirely in your browser: no data is transmitted to any server, results are instant, and nothing requires an account or subscription.
Everyday & Finance
Our everyday tools handle the calculations that come up most often: tip splitting, unit conversions, percentage changes, and date differences. The finance suite goes further — model a mortgage with a full amortisation schedule, project savings growth with compound interest, estimate the monthly contribution needed to hit a savings goal, or convert a salary between hourly, weekly, and annual figures.
Health & Fitness
The health calculators use established clinical formulas: BMI uses the standard weight/height² ratio, body fat uses the U.S. Navy circumference method, ideal weight compares four widely cited formulas (Devine, Robinson, Miller, Hamwi), and TDEE is calculated with the Mifflin–St Jeor equation. Heart rate zones follow the 5-zone model used in structured training plans. The IIFYM suite adds flexible dieting macros with adjustable splits, a food macro daily tracker with common food quick-picks, and a macro cycling calculator that generates separate training-day and rest-day targets while keeping the weekly calorie average aligned with your goal.
Math & Science
Advanced math tools are powered by mathjs — a comprehensive symbolic and numeric mathematics library. The derivative calculator performs true symbolic differentiation up to third order. The matrix calculator supports addition, multiplication, determinants, and matrix inversion. The equation solver handles linear, quadratic, and 2×2 linear systems analytically.
Interactive Graphing
The function grapher lets you plot any mathematical expression — polynomials, trigonometric functions, exponentials, logarithms, and compositions — over a configurable x-range. Plot multiple functions simultaneously, toggle their visibility, and zoom or pan interactively. It uses Plotly.js under the hood, the same library powering many scientific dashboards.