Free calculators that show you the steps
Calculators for students and everyday life: grades, math, physics, chemistry, computer science, electronics, money, fitness and home projects. We don't just give you the answer, we show you how to get there.
Grades & study
Grade averages, the score you need on your final exam, grade conversions between countries and a Pomodoro timer to focus.
Final Grade Calculator
What you need on the final to reach your target grade.
OpenGrade Average Calculator
Simple or credit-weighted average on your country's grading scale.
OpenInternational Grade Converter
Convert grades between countries' scales, with a conversion table.
OpenPomodoro Timer
25-minute focus blocks with short and long breaks.
OpenMath & statistics
Equation solvers, systems of equations, percentages and descriptive statistics with every step of the working.
Quadratic Equation Solver
Roots with the quadratic formula, discriminant, vertex and graph.
OpenSystem of Equations Solver
2x2 and 3x3 linear systems by Gaussian elimination and Cramer's rule.
OpenStatistics Calculator
Mean, median, mode, standard deviation, quartiles and frequency table.
OpenPercentage Calculator
X% of Y, percentage change, increase, decrease and reverse percentages.
OpenPhysics
Unit conversions and kinematics (SUVAT) problems solved step by step.
Chemistry
Molar mass of any formula, molarity and dilutions for the lab.
Money & finance
Loans, NPV and IRR, compound interest, budgets and savings goals explained so you understand what happens to your money.
Compound Interest Calculator
Final balance, interest earned and growth year by year.
OpenLoan & Mortgage Calculator
Monthly payment, total interest and amortization schedule.
OpenNPV and IRR Calculator
Net present value, IRR and payback with discounted cash flows.
Open50/30/20 Budget Calculator
Split your income into needs, wants and savings.
OpenSavings Goal Calculator
How much to save each month for your goal, or how long it takes.
OpenSplit Expenses by Income Calculator
Split shared bills 50/50 or by income and see what each person saves.
OpenHome & DIY
Tiles, flooring, adhesive, paint and the electricity cost of every appliance: plan materials and household costs.
Fitness & training
One-rep max and training percentages, calories and macros for your goal, and running pace with race time predictions.
Writing
Word counter with page estimates, case converter, numbers to words and APA citations for your assignments.
Word Counter
Words, characters, pages and reading time.
OpenAPA Citation Generator
APA 7 references for books, articles and websites, ready to copy.
OpenCase Converter
Uppercase, lowercase, title case, sentence case and cleanup.
OpenNumber to Words Converter
Numbers and check amounts in words, ordinals and Roman numerals.
OpenComputer science
Networking, number systems, digital logic and algorithms, with the working your exam asks for.
Two's Complement Calculator
Signed integers in two's complement, one's complement and sign-magnitude, plus overflow.
OpenIEEE 754 Floating-Point Converter
32 and 64-bit floating point with biased exponent and rounding error.
OpenKarnaugh Map Solver
Minimal SOP and POS expressions with the groups highlighted on the map.
OpenIPv4 Subnet Calculator
Network, broadcast, hosts, wildcard and VLSM planning with the binary AND.
OpenTruth Table Generator
Truth table for any expression, with minterms and canonical forms.
OpenNumber Base Converter
Binary, octal, decimal, hex and bases 2–36 with repeated division.
OpenSorting Algorithm Visualizer
Animated sorting with comparison and write counters.
OpenElectronics
Resistor color codes, Ohm's law and voltage dividers for labs and projects.
Why use CalcTask
The method, not just the answer
Every tool shows the steps using the method taught in class, so you can repeat it yourself in the exam.
Truly private
Calculations run in your browser. Nothing you type is sent to a server, and you do not need an account.
Explained and tested
Under each tool you will find how the method works, worked examples and answers to common questions.
Made by a student
The tools come from real needs in class. If you miss one, suggest it.