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複雑な計算を簡素化するように設計された、幅広い強力なオンライン計算機をご覧ください。直感的なツールで計算を効率化します。

VO2 Max Estimator Calculator

VO2 Max Estimator Calculator VO2 max is the maximum rate at which your body can take in and use oxygen during all-out exercise. It is the most widely used objective measure of aerobic (cardiorespiratory) fitness, and it scales with how hard, how long, and how often you can sustain endurance work. Reaching a true lab-grade VO2 max number requires breath-by-breath gas analysis on a treadmill — but several validated field tests give a very useful estimate in minutes, with no equipment beyond a stopwatch and a heart-rate monitor. This calculator runs four classic estimation methods, applies age- and sex-adjusted norms to tell you where you stand, and converts your numbers ...

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数学

Big Integer Calculator

Big Integer Calculator Compute exact results for math expressions that overflow ordinary calculators. The tool runs entirely on JavaScript BigInt, so factorial(1000), 25000, fibonacci(10000), and primality checks on trillion-digit candidates return every digit correctly — no scientific notation, no silent rounding. How to Use Type an integer expression, for example 2 ** 1000, factorial(100), or gcd(1071, 462). Pick an output base (decimal, hex, binary, octal). The result updates as you type. Use Copy or Download to grab the full result — useful when the number runs to thousands of digits. Read the digit count under the result to compare growth rates of different expressions. Features Operators – +, -, *, ...

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開発者数学

GPU VRAM Calculator

GPU VRAM Calculator Estimate how much GPU memory a transformer model needs for inference or training. Enter parameters, precision, batch size, and sequence length, and the calculator returns total VRAM along with a breakdown of weights, gradients, optimizer state, KV cache, and activations. It also compares the result against common GPUs (RTX 4090, A100, H100, H200, B200) so you can see at a glance which one fits. How to Use Pick a preset (Llama 3 8B, Mistral 7B, Llama 3 70B, etc.) or choose Custom and enter your own parameters, hidden dimension, and layer count. Select Inference or Training. Training reveals optimizer, mixed-precision, and gradient-checkpointing options. Choose a precision: float32, ...

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データ開発者

Wire Size Calculator (AWG & mm²)

Wire Size Calculator (AWG & mm²) Pick the right copper or aluminum conductor for any DC, single-phase AC, or 3-phase AC circuit. Enter your load current, supply voltage, and one-way cable length and the calculator iterates the NEC ampacity table to find the smallest wire that handles the load and keeps voltage drop under your limit. Choosing a wire that is too small wastes power as heat, sags the voltage at the load, and is a real fire hazard — yet it is exactly the kind of decision generic AI chatbots get wrong because they confuse the NEC 310.16 and 310.17 tables or misquote resistance values. How to Use Enter ...

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データ数学

Rule of 72 Calculator

Rule of 72 Calculator A fast, two-way doubling-time calculator. Enter an annual rate to see how many years money takes to double, or enter a target number of years to see the rate you need. The tool compares the classic mental-math shortcuts (Rule of 72, 70, and 69.3) against the exact compound result derived from logarithms, so you can see when each approximation is most accurate. How to Use Pick a direction: Rate → Years (how long does it take to double?) or Years → Rate (what return do I need?). Enter the annual interest rate as a percent (e.g. 7 for 7%) or the target doubling period in years. ...

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データ数学

Photography Exposure Value (EV) Calculator

Photography Exposure Value (EV) Calculator Dial in the exposure triangle without leaving the browser. Pick any two of aperture, shutter speed, and ISO and the calculator solves for the third, displays the resulting EV, and lays out every equivalent combination at the same exposure. A built-in scene reference based on the classic Sunny 16 rule helps you start from real-world lighting instead of guessing. How to Use Choose what you want to Solve For — aperture, shutter speed, ISO, or just EV. Set the two settings you already know from the standard 1/3-stop dropdowns. Pick a scene preset (Sunny 16, overcast, indoor, moonlight, etc.) or enter a manual target EV ...

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画像数学

Heat Index & Wind Chill Calculator

Heat Index & Wind Chill Calculator Find out what the weather really feels like. This calculator combines temperature with humidity (for hot days) or wind speed (for cold days) to produce a “feels like” temperature using the official NOAA / National Weather Service formulas, then maps the result to a color-coded safety category so you can plan outdoor activity at a glance. How to Use Pick a mode: Heat Index (hot & humid) or Wind Chill (cold & windy). Choose your temperature unit (°F or °C) and enter the air temperature. For Heat Index, enter the relative humidity (0–100%). For Wind Chill, choose a wind-speed unit and enter the wind ...

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開発者数学

Multi-Base Arithmetic Calculator (Hex / Binary / Octal)

Multi-Base Arithmetic Calculator (Hex / Binary / Octal) Add, subtract, multiply, divide, and take the modulo of numbers written in binary, octal, decimal, or hexadecimal — and see the answer in all four bases at once. The calculator uses arbitrary-precision BigInt arithmetic, so large hexadecimal values stay exact, and it visualises the carry, borrow, shift-and-add, and long-division steps that a typical AI text answer skips. Pick a fixed bit width (8, 16, 32, or 64-bit) to flag signed and unsigned overflow with the corresponding two’s-complement value. How to Use Type the first number. Prefix it with 0b for binary, 0o for octal, 0x for hex, or leave it bare for ...

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開発者数学

Pet Food Portion Calculator (Dog & Cat)

Pet Food Portion Calculator Overfeeding is the single most common cause of preventable health problems in dogs and cats, but bag charts are notoriously rough — they cover the average couch-potato adult, not your pet. This calculator uses the same Resting Energy Requirement (RER) formula used by veterinarians and the WSAVA Global Nutrition Committee, then scales it by a life-stage and activity multiplier to give you a daily calorie target. It then converts those calories into grams and cups for the specific food you feed. Enter the weight, pick a life stage, choose a food type, and the tool will tell you how much to put in the bowl each ...

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電卓楽しい

Moon Phase Calculator

Moon Phase Calculator The Moon Phase Calculator shows you exactly what the Moon looks like on any date from 1900 to 2100. Pick a day and instantly see an accurate moon disc, the phase name, illumination percentage, the Moon’s age in the current lunar cycle, and how many days remain until the next new and full Moons. A monthly calendar view reveals the whole lunation at a glance, and a Southern Hemisphere toggle flips the disc so the orientation matches what you see from your sky. How to Use Open the calculator and pick any date in the date field. It defaults to today so you can see the current ...

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電卓科学

Irregular Polygon Area Calculator

Irregular Polygon Area Calculator Type a list of vertex coordinates and instantly get the area, perimeter, and centroid of any flat polygon — convex or concave, axis-aligned or skewed, three vertices or thirty. The calculator uses the classic Shoelace formula so the answer is exact (no triangulation, no approximations), and it draws a live SVG preview so you can confirm the shape matches what you intended before trusting the numbers. It’s a quick way to verify a hand calculation, double-check a CAD value, work out the footprint of a non-rectangular floor plan, or estimate how much paint, fabric, or material an oddly-shaped surface needs. Everything runs in your browser — ...

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データ開発者

Syllable Counter & Poetry Analyzer

Syllable Counter & Poetry Analyzer Paste any text, lyric, or poem and instantly see how many syllables each word and line contains. The tool also validates classic forms — haiku (5-7-5), tanka (5-7-5-7-7), and limerick (8-8-5-5-8) — and can highlight estimated stressed syllables so you can audit the meter of your verse. Unlike a chat-based assistant, this counter runs a deterministic algorithm in your browser using a phonetic dictionary plus fallback rules. The result is consistent, reproducible counts for songwriting, scansion practice, classroom exercises, and poetic-form revisions. How to Use the Syllable Counter Paste or type your text into the input area, or use one of the example buttons (haiku, ...

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数学文章

NPV & IRR Calculator

NPV & IRR Calculator Evaluate an investment opportunity the way finance professionals do. This calculator turns a stream of yearly cash flows into the four numbers that matter most for any capital-budgeting decision: Net Present Value (NPV), Internal Rate of Return (IRR), Modified IRR (MIRR), and the Profitability Index. It also reports the simple and discounted payback periods and shows how sensitive your NPV is to small changes in the discount rate. How to Use Enter the initial investment as a positive dollar amount — the tool treats it as the year-zero outflow automatically. Paste your cash flows (one value per line) into the textarea. Use negative numbers to represent ...

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データ開発者

出産予定日計算機

Pregnancy Due Date Calculator Estimate your baby’s due date instantly from your last menstrual period, conception date, or IVF transfer date. Get your current gestational age, trimester, progress toward 40 weeks, and a complete timeline of key prenatal milestones and appointment windows — all calculated in your browser with no data sent to a server. How to Use Choose a calculation method – Last Menstrual Period (LMP), conception date, or IVF transfer date. Enter the relevant date – the form adapts to your selection and only shows inputs you need. Adjust your cycle length if needed – the default 28-day cycle suits most people; longer or shorter cycles shift the ...

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健康計画

マクロ栄養素計算機

Macronutrient Calculator Turn a daily calorie goal into precise gram targets for protein, carbohydrates, and fat — split exactly the way you eat. Pick a preset diet (balanced, high protein, keto, endurance, zone) or drag the sliders to a custom split, then choose how many meals you eat per day. The calculator instantly returns grams per macro per day, calories contributed by each macro, and a per-meal breakdown so you know what to put on every plate. How to Use Enter your daily calorie goal (use a TDEE calculator if you don’t have one). Pick a diet preset — the protein/carb/fat sliders snap to that split. Drag any slider to ...

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データ数学

モーラー質量計算機

Molar Mass Calculator Type a chemical formula and get the exact molar mass in g/mol, a per-element breakdown, and the mass percentage of each element. Atomic weights use IUPAC 2021 standard values so results are reliable for laboratory and coursework use. Parentheses, polyatomic groups, and hydrate notation (CuSO4·5H2O) are fully supported. How to Use Enter a chemical formula in the input box (for example, C6H12O6 for glucose). Pick an output unit: g/mol, kg/mol, or atomic mass units per molecule. Set the number of decimal places (4 is standard for lab work). Read the total molar mass from the summary card and review each element’s contribution and mass percentage in the ...

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データ数学

1RM計算機

One-Rep Max (1RM) Calculator Estimate your one-rep max from any working set without ever loading a maximal attempt. Plug in the weight you lifted and the number of clean reps to failure, and the calculator returns five validated 1RM estimates (Epley, Brzycki, Lombardi, O’Conner, Wathan), the average across formulas, a percentage-of-1RM rep chart, and a five-set warm-up progression. Toggle between kilograms and pounds to match how your gym is set up. How to Use Pick your unit — kilograms or pounds. Enter the weight you actually lifted (bar plus plates). Enter the reps you completed to failure. Stay between 1 and 15 — beyond that the formulas drift fast. Read ...

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健康数学

画像プリントサイズ計算機

Image Print Size Calculator Convert pixel dimensions to physical print size, or work backwards to find the pixel resolution you need for a target print. The calculator pairs the math with a quality-rating table so you can see at a glance whether your image is sharp enough for a 4×6 photo, an A4 print, or a 24×36 poster. How to Use Pick the direction: Pixels → Print Size (you have an image and want to know its print size) or Print Size → Pixels Needed (you have a target print and want the required pixels). Enter the inputs for that mode. In Mode A, type the image width and height ...

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画像数学

明るさ・照度単位変換

輝度・照度単位変換 輝度と照度の間を1画面で変換できます。照度（ルクス、フィート・キャンドル、フォト、ミリルクス、ノックス）は、表面に到達する光の量を表し、デスクや床の光度計で測られます。輝度（cd/m²、フィート・ランダート、スチルブ、ランダート、cd/ft²）は、表面から放出される光の量を表し、目に見えるスクリーン、空、壁からの光を表します。これらは異なる物理的次元を持ち、変換を行うにはその間の関係を理解する必要があります。

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