教育
グラフと関数電卓、数学ヘルプ、学校や学習向けの説明。
16種類の計算機
教育
Math Help
Stuck on a problem? Here you will find explanations that go beyond the answer. Every calculator on this site shows the formula, the steps and the common mistakes, so next time you can work it out yourself.
Graphing Calculator
Plot mathematical functions right in your browser. Type a function like x^2 or sin(x), add more to compare them, and drag or zoom to explore the graph.
関数電卓
A complete scientific calculator, right in your browser. Work with trigonometry, logarithms, powers, roots and factorials — no install, no cost.
Weighted Grade Average Calculator
In a weighted average, not every test counts equally: an exam might weigh twice as much as a quiz. Enter up to four grades with their weights and see the true average instantly, including the calculation steps.
Final Grade Calculator
Part of your final grade is already fixed, but a test, assignment or exam is still coming. Enter your current average, the percentage already fixed, and your goal to see instantly what grade you still need on the remaining part.
Score to Grade Calculator
Dutch schools have used the linear correction model for decades to convert test scores into grades between 1 and 10. This model ensures fairness: 0% always scores a 1 (the lowest grade), and 100% always a 10 (the highest). For every percentage in between, the scale is perfectly linear. It is especially popular in secondary education (havo, vwo and vmbo) and many universities. Use this calculator to quickly convert your test score to the final grade, with all intermediate steps visible.
Points Needed for a Grade
If you know how many points a test is worth and what grade you want, you can calculate in advance the minimum score you need, instead of working out your grade afterwards and being disappointed. This calculator uses the standard Dutch/Belgian 1-to-10 grading scale.
Reading Time Calculator
Content creators and publishers want to know how long readers need for their articles. A reading time estimate helps readers plan their time better and increases engagement. This calculator computes it automatically based on word count.
Typing Speed Calculator
Typing speed is expressed in words per minute (WPM), but errors count against you. Enter how many words you typed, in how much time, and with how many errors to see both your gross and your true (net) speed and accuracy.
Words to Pages Calculator
For an essay, paper or thesis it helps to know in advance how many pages your text will be, for example to meet a set page limit. This calculator converts your word count into a realistic page estimate based on the formatting you use. The formatting — double- or single-spaced — makes a big difference to the result.
Study Hours Calculator
A credit (EC or ECTS) officially represents a fixed amount of study time, including lectures, self-study and exams. With that figure you can calculate how many hours per week a course realistically demands, so you avoid under- or overestimating your week.
Exam Countdown Calculator
Enter the date of your exam or test to instantly see how many days and weeks you have left to prepare. A concrete number of days makes study planning far more realistic than a vague sense of "a few weeks left", and helps you start on time.
Cumulative GPA Calculator
Your cumulative average combines all credits earned so far, not just the latest period. Enter your previous average and the new results to see the updated total instantly, correctly weighted by credits.
Number Base Converter
Computers work internally in binary, and programmers often use hexadecimal notation for memory addresses and colour codes. Enter an ordinary decimal number to see it instantly converted to binary, octal and hexadecimal — handy for programming, networking or number-system homework.
Roman Numeral Converter
Roman numerals still show up on clocks, in film credits, for numbering chapters and on buildings. Enter a number between 1 and 3999 and this calculator instantly converts it to the correct Roman form, built according to the classic subtractive rules.
Grade to US GPA Converter
When applying to a university abroad, a GPA is often requested, while Dutch institutions grade on a scale of 1 to 10. There is no legally fixed conversion between the two systems, but this calculator gives an indicative value based on a simple linear scale mapping.
Learning goes faster with the right tools. This category bundles education tools: a graphing calculator, a scientific calculator, maths help and calculators for grades, averages and GPA.
Everything runs in your browser, with no installation — handy for homework, exams and test preparation, at home or in class.
Overview
The education category includes an online graphing calculator, a scientific calculator, a maths-help hub and tools for weighted averages, required grades and GPA conversion.
How to use these calculators
- 1Pick the tool that matches your subject or question.
- 2Enter functions, grades or numbers.
- 3Use the explanation to truly understand the material.
Common mistakes
- Confusing degrees and radians with sine and cosine.
- Confusing weighted and unweighted averages.
- Forgetting the exam mode of a physical calculator.
Tips
- Practise with the graphing calculator before your exam so the controls feel familiar.
- Use the maths help to learn step by step, not just to copy the answer.
よくある質問
Is the graphing calculator free?
Yes, the online graphing and scientific calculators are completely free.
Can I use these tools during an exam?
Schools have their own rules; use them mainly to practise and understand.
What is GPA and how do I convert it?
GPA is a grade average on a 4-point scale; the GPA tool converts your grades.