🔬 科學研究工具

🔗 AWG線規轉換器Wire Gauge Converter 輸入 AWG 美國線規號，換算為公制線徑、截面積與每千米電阻，或反向查詢，用於線纜選型、載流量評估與電路佈線對照。Wire Gauge Converter - convert values online, free and instant. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the S... 💡 LED限流電阻計算器LED Resistance Calculator 輸入電源電壓、LED 正向壓降與額定工作電流，計算所需串聯限流電阻阻值、實際消耗功率，並給出最接近的標準電阻選型建議。LED Resistance Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the ... 📚 NATO 音標字母Nato Phonetic NATO 音標字母：把文本逐字母轉成 Alpha、Bravo、Charlie 拼讀。Convert text to the NATO phonetic alphabet (Alpha, Bravo, Charlie…) for clear spelling over radio or phone. Type and copy instantly—client-side, no upload. 🔧 PCB走線寬度計算器Pcb Trace Width 基於 IPC-2221 標準，輸入電流、銅厚與允許温升，計算 PCB 銅箔走線所需寬度，用於電路板佈線設計，避免過流發熱過載。Pcb Trace Width - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🎲 Pharmacode 條形碼Pharmacode Barcode Pharmacode 條形碼：輸入 1~131070 的整數，生成藥品二進制條碼。Generate Pharmacode barcodes from numbers 1–131070 for pharmaceutical packaging. Adjust width and preview—100% client-side, no upload, free online generator. 🧮 P值計算器P Value Calculator 按統計量與自由度計算 P 值並給出顯著性水平提示，支持 t、卡方等常見檢驗，用於統計結果判讀，純前端計算。P Value Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scienti... ⏱️ RC時間常數 (τ) 計算器RC Time Constant Calculator ⏱️ RC時間常數 (τ) 計算器RC Time Constant Calculator - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Resear... 🧮 T分數計算器T Fraction Calculator 輸入樣本均值、總體均值、標準差與樣本量，計算 t 分數，用於小樣本下與總體均值的差異檢驗，結果用於查表判斷顯著性。T Fraction Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scie... 🧮 Z分數計算器Z Fraction Calculator 輸入數值、總體均值與標準差，計算標準分數 Z，衡量該值偏離均值多少標準差，用於成績標準化、異常檢測與統計比較。Compute Z-scores from a value, mean and standard deviation, with the 68-95-99.7 rule. See standard deviations from the mean—free, client-side, instant. 🧮 n 次方根計算器Nth Root Calculator n 次方根計算器：輸入底數與根指數 n，計算 n 次方根並展示計算步驟，支持任意正實數開方運算。Nth Root Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scient... 🧮 一元二次方程求解Quadratic Equation Solver 一元二次方程求解器：輸入二次項係數 a、b、c，按判別式求實數根（含重根與虛根），並給出求解步驟，用於代數學習與解題驗證。Solve quadratic equations (ax^2+bx+c=0) online, step by step. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Sci... 🧮 三角函數計算器Trigonometry Calculator 輸入正弦、餘弦、正切等函數值，計算其反三角函數對應的角度，支持角度制與弧度制切換，用於三角方程求解與幾何測量。Trigonometry Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Sc... 🧮 中位數計算器Median Calculator 中位數計算器：輸入一組數據，自動排序並取中間值，不受極端值影響。Median Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientif... 🧮 二次方程求解器Quadratic Equation 輸入係數 a、b、c，求解一元二次方程 ax² + bx + c = 0 的根，返回實根或復根及判別式，用於代數作業與拋物線交點分析。Quadratic Equation - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🔬 交互式元素週期表Cycle 點擊元素查看詳情，支持按名稱/符號/原子序數搜尋，按類別着色。內置全部 118 種元素數據。Cycle - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🧮 眾數計算器Mode Calculator 輸入一組數值，找出出現次數最多的眾數，可返回一個或多個眾數，也能判斷無眾數情形，用於頻數統計、數據分佈與教學示例。Mode Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific... ⚗️ 元素週期表Periodic Table 展示 118 個化學元素的完整週期表，點擊任一元素查看原子序數、符號、原子量、電子排布與物性等詳情，用於化學學習與查表。Periodic Table - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🧮 公積金計算器Housing Fund Calculator 公積金計算器：輸入工資基數與繳存比例，計算個人與單位月繳存額、貸款額度與月供參考，用於住房公積金規劃。Calculate housing provident-fund monthly contribution, pooled balance and estimated loan amount and repayment from salary, rates and tenure. Reference—free. ⚗️ 分子量計算器Calc Cycle 輸入化學式自動解析元素並計算分子量，支持括號與嵌套，內置全部 118 種元素原子量。Calc Cycle - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Rese... 🧮 分數計算器Fraction Calculator 對分數進行加減乘除與約分、通分，支持帶分數與小數互轉，適合數學作業校對，純前端計算即時出結果。Fraction Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scient... ⚛️ 功 W = F·d·cosθWork Done 由力的大小、位移與夾角，按 W = F·d·cosθ 計算恆力所做的功。Work Done - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. ⚛️ 功率 P = F·vMechanical Power Calculator 輸入作用力與同向速度，按 P = F·v 計算機械功率（瓦特）並支持單位換算，用於力學做功、傳送帶與電機出力估算。Mechanical Power Calculator - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Resear... ⚛️ 動能 E_kKinetic Energy Calculator 輸入物體的質量與速度，按 E_k = ½mv² 計算平動動能（焦耳）並支持單位換算，用於力學作業、碰撞分析與運動能量估算。Kinetic Energy Calculator - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research... ⚛️ 化學式摩爾質量計算器Molar Mass Calculator 輸入化學式計算摩爾質量（如H2O、NaCl、C6H12O6、H2SO4）Molar Mass Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scie... ⚗️ 化學方程式配平器Equation Balancer 輸入未配平的化學方程式，自動求解最小整數化學計量數並驗證原子守恆。支持括號 Ca(OH)₂、水合物 CuSO₄·5H₂O。Equation Balancer - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🧪 化學計算器Chemistry Calculator 輸入化學式（支持括號如 Ca(OH)₂），計算分子摩爾質量，並可求解溶液濃度、pH 值與理想氣體狀態方程，適合化學學習與實驗配液。Chemistry Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scien... 🧮 單因素方差分析（ANOVA）Variance Analysis ( ANOVA ) Calculator 單因素方差分析（ANOVA）計算器：輸入多組樣本數據，計算組間/組內平方和、F 值與顯著性，判斷多組均值是否存在顯著差異。Variance Analysis ( ANOVA ) Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install.... ⚛️ 單擺週期 TPendulum Period Calculator 由擺長與重力加速度，按 T = 2π√(L/g) 計算小角度單擺週期。Pendulum Period Calculator - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Researc... 🧮 卡方計算器Chi Square Calculator 輸入觀察頻數與期望頻數計算卡方值與自由度，並給出顯著性提示，用於分類變量獨立性檢驗，純前端計算。Chi Square Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scie... 🌡️ 壓力單位轉換器Pressure Converter 輸入壓力數值，在帕斯卡、巴、PSI、標準大氣壓、毫米汞柱等單位間換算，用於工程、氣象與醫療場景下的壓力單位轉換。Pressure Converter - convert values online, free and instant. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Sci... 🌈 可見光波長轉RGB顏色Wavelength to RGB 輸入 380-780nm 可見光波長，轉換為對應的 RGB 顏色值及近似色名，用於光譜可視化、LED 配色與光學演示中的顏色映射。Wavelength to RGB - convert values online, free and instant. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scie... ⚛️ 向心力 F_cCentripetal Force 由質量、線速度與曲率半徑，按 F = mv²/r 計算勻速圓周運動所需向心力。Centripetal Force - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. ➡️ 向量計算器Vector Calculator 向量計算器：支持二維/三維向量的加減、點積、叉積、模長與夾角運算，並可可視化展示向量關係，用於線性代數與物理計算。Vector Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientif... 🧮 四分位數計算器Quartile Calculator 輸入一組數值，計算第一、第二（中位數）、第三四分位數及四分位距 IQR，用於數據分佈描述、箱線圖繪製與異常值篩查。Quartile Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scient... 📏 國際單位(SI)轉換器SI Unit Converter 國際單位（SI）轉換器：覆蓋 7 個 SI 基本量、詞頭（千/毫/微等）與導出單位換算，用於物理量單位統一與科學記數法轉換。SI Unit Converter - convert values online, free and instant. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scie... 🧮 圓周率 π 位數查詢Pi Digits 圓周率 π 位數查詢工具：輸入位數 N 展示圓周率 π 的前 N 位小數，用於數學演示、精度測試與教學查閲。Pi Digits - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🌍 地理距離計算器Geography Distance Calculator 基於 Haversine 公式計算兩點間大圓距離，支持方位角計算與地圖可視化Geography Distance Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of ... 🧭 地理距離計算（經緯度）Calc Distance 基於 Haversine 公式計算地球表面兩點間的大圓距離，支持十進制度與度分秒輸入Calc Distance - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific R... ✅ 墨西哥 RFC 驗證Rfc Validator 墨西哥 RFC 驗證工具：輸入墨西哥納税人登記號（RFC），校驗格式、長度與校驗位合法性，用於跨境身份與税號核驗。Rfc Validator - check and validate online, free. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Resea... ⚛️ 聲波多普勒頻移Doppler Effect 由波速、源頻率、觀察者速度與波源速度，按 f' = f(v+v_o)/(v-v_s) 計算接近時的觀測頻率。Doppler Effect - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🌌 天文地理計算器Astronomy Geography Calculator 🌌 天文地理計算器Astronomy Geography Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of... 🔭 天文觀測工具箱Astronomy Toolkit 月相查詢 / 星等亮度對比 / 隕石撞擊坑估算 / 經緯度與UTM轉換 / 極晝極夜判斷 / 觀測條件評估Astronomy Toolkit - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. ⚛️ 密度 ρ = m/VDensity Calculator 輸入物質的質量與體積，按 ρ = m/V 計算密度（如 g/cm³ 或 kg/m³）並可切換單位，用於材料識別、浮力判斷與實驗測量。Density Calculator - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🧱 密度/質量/體積換算Density / Mass / Volume Converter 輸入密度、質量、體積中的任意兩個量，按公式 ρ=m/V 自動計算第三個量，方便物質密度與質量體積的相互換算。Convert density, mass and volume (rho = m / V). Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Resear... 🎲 密碼短語生成器Passphrase Generator 密碼短語在線生成器，從詞庫隨機抽取多詞組成易記高熵密碼短語，可設詞數與分隔符，適合賬户安全，數據本地生成不上傳，純前端。Passphrase Generator - generate results online, free and instant. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the... 🧮 對數計算器Logarithm Calculator 輸入底數與真數，計算常用對數 log₁₀、自然對數 ln 及任意底 logₙ(x)，支持換底運算，用於對數縮放、分貝換算與科學計算。Logarithm Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scien... 🧮 冪計算器Power Calculator 冪計算器：輸入底數與指數，計算 base^exponent 冪運算結果，支持正負數與小數指數，用於數學與工程計算。Power Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientifi... 🧮 平均數計算器Mean Calculator 平均數計算器：輸入數值集合，計算算術平均、幾何平均與調和平均三種平均值，適用於統計與科學數據分析。Mean Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific... 🧮 平方根計算器Root Calculator 平方根計算器：計算 √x 主平方根，並對負數返回虛數結果，支持實數與複數根式運算，用於數學計算。Root Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific... ⚛️ 庫侖定律Coulomb Force Calculator 由兩電荷量與距離，按 F = k·q₁q₂/r²（k=8.988×10⁹）計算真空中兩點電荷間靜電力大小。Coulomb Force Calculator - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research ... 🔩 扭矩單位轉換器Torque Converter 輸入扭矩數值，在牛·米、磅·英尺、千克力·米等單位間換算，用於機械、汽車與工業設備中選型對照與力矩單位轉換。Torque Converter - convert values online, free and instant. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scien... 🧮 指數計算器Exponent Calculator 指數計算器：輸入實數 x 計算 eˣ，並支持常用指數函數（如 aˣ、e^{kx}）運算，用於數學與科學計算。Exponent Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scient... 🧮 排列數 P(n, r)Permutation Calculator 從 n 個不同元素中取 r 個的排列數：P(n,r) = n! / (n−r)!Permutation Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Sci... 📝 提取電話號碼Extract Phone Number 粘貼一段文本，自動提取其中出現的電話號碼（手機與固話），按行列出便於複製整理，用於從通訊錄、日誌或文檔中批量抽取號碼。Extract Phone Number - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🧮 效應量計算器Effect Size Calculator 輸入兩組樣本的均值、標準差與樣本量，計算 Cohen's d 等效應量，衡量實驗處理效果的統計學意義，用於論文寫作與社科研究。Effect Size Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Sci... 🧮 斐波那契數列工具Fibonacci 斐波那契數列工具：生成指定項數的斐波那契數列，展示相鄰項比值趨近黃金分割比 φ 的特性，用於數學教學與序列分析。Fibonacci - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. ⚛️ 斜拋射程與最大高度Projectile Range 由初速度與拋射角，按 R=v²sin(2θ)/g、H=v²sin²θ/(2g) 計算水平射程與最大高度。Projectile Range - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🧮 方差計算器Variance Calculator 計算樣本或總體方差與標準差，輸入數據集即得離散程度，用於統計作業與數據質量分析，純前端即時計算。Variance Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scient... ⭐ 星等亮度對比Star Magnitude Compare 輸入兩個星等數值計算亮度比，或從內置恆星表中選擇對象對比，按星等差每 5 等約 100 倍的規律換算視亮度，用於天文科普。Star Magnitude Compare - compare online, free and clear. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientif... 🧮 最大公約數（GCD）Gcd Calculator 輸入兩個或多個整數，用歐幾里得算法求它們的最大公約數，用於分數約分、週期同步與數論問題，支持多數值一次性批量求解。Gcd Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific ... 🧮 最小公倍數（LCM）Lcm Calculator 利用 LCM(a,b)=|a·b|/GCD(a,b)，輸入若干正整數計算它們的最小公倍數，適用於通分、週期對齊等數學計算場景。Lcm Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific ... 🔢 有效數字計算器Significant Figures 有效數字計算器Significant Figures - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🧮 極差計算器Range Calculator 輸入一組數據計算最大值與最小值之差（極差），並附簡單統計，用於數據離散程度初探，純前端即時統計。Range Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientifi... 🌅 極晝極夜日期判斷Polar Day Night 輸入緯度，計算該緯度出現極晝與極夜的起止日期、持續時間及全年光照分佈信息，用於地理與天文現象查詢。Polar Day Night - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🧮 樣本量計算器Sample Size Calculator 樣本量計算器：設定置信水平與誤差範圍，反推調查或實驗需要多少個樣本。Compute survey sample size from population, confidence level, margin of error and expected proportion. Step-by-step math for research—free, client-side. 🎲 概率計算器Probability Calculator 概率計算器：計算常見離散與連續概率分佈的事件發生概率並可視化分佈曲線，輔助統計學習與風險評估。Probability Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Sci... ⚡ 歐姆定律計算器Ohms Law Calculator 輸入電壓、電流與電阻中的任意兩個已知量，按 V = I×R 求解第三個未知量，並可計算電功率 P = VI，用於基礎電路設計與電池供電分析。Ohms Law Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scient... 🌊 潮汐高度估算Tide Height Estimator 基於月球引力模型，輸入日期、月相與緯度估算理論潮汐高度，為近海活動、養殖與觀潮提供潮汐參考。Tide Height Estimator - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🔥 熱傳遞計算器Heat Transfer Calculator 輸入温度差、比熱容、質量或傳熱係數，按 Q=mcΔT 計算傳導、對流與輻射的熱量傳遞，用於熱力學作業與散熱設計估算。Heat Transfer Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the S... ⚛️ 牛頓第二定律 F = maNewtons Second 輸入物體質量與加速度，按 F = ma 計算所受合外力（牛頓）並支持單位換算，用於力學作業、推力估算與受力分析。Newtons Second - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🧮 物理單位換算（力、功、功率等）Physics Unit Convert 在牛頓、焦耳、瓦特等力、功、功率單位間換算，處理常用前綴，用於物理作業與工程估算，純前端即時換算。Physics Unit Convert - convert values online, free and instant. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the S... ⚛️ 物理計算器Physics Calculator 物理計算器：選定公式後填入已知變量，自動解出未知量。Solve common physics formulas—kinematics, force, energy, electricity—with a built-in constants table. Enter variables, get results instantly—free, browser-only. 🧪 理想氣體狀態方程Ideal Gas Law Calculator (PV = nRT) 輸入任意三個已知量，求解第四個未知量。R = 8.314 J/(mol·K)。Compute pressure, volume, temperature or moles of an ideal gas. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the S... ⚛️ 電場強度 EElectric Field Point 由點電荷與距離，按 E = k·q/r²（k=8.988×10⁹）計算真空中該點電場強度。Electric Field Point - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🔋 電池續航時間計算器Battery Life Calculator 電池續航時間計算器：根據電池容量（mAh/Ah）、負載電流或功率與效率，估算設備持續工作時間（小時），用於電源選型與續航評估。Battery Life Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Sc... 🎲 電話二維碼Phone QR 將電話號碼生成為可撥號的二維碼，掃碼即發起呼叫，適合名片與海報，純前端生成不上傳任何數據。Phone QR - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 📚 電話號碼查詢Phone Lookup 輸入電話號碼，查詢其號段、歸屬地區與運營商信息（基於內置號段數據），用於快速識別來電歸屬地，結果在本地瀏覽器內處理。Phone Lookup - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🔌 電阻分壓器計算器Voltage Divider Calculator 輸入輸入電壓與兩個串聯電阻阻值，計算分壓電路的輸出電壓，用於傳感器偏置、電平轉換與參考電壓設計，支持單位換算。Voltage Divider Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the... 🎨 電阻色碼解碼器Resistor Color Code 電阻色碼解碼器：讀取四環/五環電阻色環顏色，按色碼錶換算標稱阻值與誤差，並支持反向由阻值查色環，適合電子愛好者速查。Resistor Color Code - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🧮 百分位數計算器Percentile Calculator 輸入數據集合與目標百分位（0-100），計算對應的百分位數數值，用於成績排名、生長曲線與統計分位分析，説明數據所處位置。Percentile Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scie... 🧮 相關係數計算器Correlation Calculator 輸入成對的 X 與 Y 兩組數據（個數須相等），計算皮爾遜相關係數，量化兩組變量間的線性相關方向與強弱，用於實驗數據分析與統計檢驗。Correlation Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Sci... 🔢 矩陣計算器Matrix Calculator 輸入一個或多個矩陣，進行加減乘、轉置、求行列式、逆矩陣、秩與冪運算，用於線性代數作業、方程組求解與計算機圖形變換。Matrix Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientif... 🧮 科學計算器Science Calculator 提供四則、冪、對數、三角函數等科學運算，支持括號與歷史，適合學習作業與工程速算，純前端運行無需安裝。Science Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scienti... ⚛️ 簡諧振動週期 TSpring Oscillation Period 輸入振子質量與彈簧剛度，按簡諧振動週期公式 T=2π√(m/k) 計算彈簧振子的振動週期，用於物理教學與實驗。Spring Oscillation Period - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research... 💧 管道流量計算器Flow Calculator 輸入管道截面積（或管徑）與流體流速，按 Q = A×v 計算體積流量，或輸入容器體積與充滿時間求平均流量，用於給排水與化工估算。Flow Calculator - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🧮 素數工具Prime 素數在線工具，判斷整數是否為素數，或生成指定範圍內的素數表、求質因數分解，適合數論學習與編程驗證，純前端運行。Prime - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🧮 線性方程組求解（2元/3元）Xianxingfangchengzuqiujie 2yuan 3yuan 線性方程組求解器（2元/3元）：輸入二元或三元一次方程組的係數，按克萊姆法則或消元法求解未知數，用於代數與工程計算。Xianxingfangchengzuqiujie 2yuan 3yuan - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scienti... ✅ 組合數 C(n, r)Combination Calculator 從 n 個不同元素中取 r 個的組合數：C(n,r) = n! / (r!·(n−r)!)Combination Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Sci... 📍 經緯度與UTM座標轉換Latlon Utm Converter 基於 WGS84 橢球體，在經緯度（WGS84）與 UTM 平面直角座標之間互轉，用於地圖定位與測繪座標轉換。Latlon Utm Converter - convert values online, free and instant. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the S... 🧮 統計學計算（均值、方差、標準差）Calc Stats 統計描述計算器：輸入數據集，計算算術均值、方差與標準差等描述統計量，輔助科研數據彙總與離散程度分析。Calc Stats - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Rese... 📊 統計計算器Statistics Calculator 統計計算器：計算描述統計量、頻數分佈並繪製直方圖可視化，支持樣本方差等推斷統計，用於數據分析與教學。Statistics Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scie... ⚛️ 胡克定律 F = kxHookes Law 輸入彈簧剛度係數與形變量，按胡克定律 F=kx 計算彈簧的恢復力（彈性力），適用於彈簧受力分析與機械設計。Hookes Law - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. 🍎 自由落體運動計算Free Fall Motion Calculator 輸入下落高度、初速度與重力加速度，計算物體自由下落的落地時間與落地末速度，適用於物理課堂演示與拋體運動實驗估算。Solve free-fall time, velocity and distance under gravity. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scient... 🚗 速度/距離/時間計算Speed / Distance / Time Calculator 輸入速度、距離、時間中的任意兩個已知量，自動求解第三個量，適用於勻速直線運動的路程與時間估算。Compute speed, distance or time in kinematics. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Researc... ⚡ 邏輯門模擬器Logic Gate Simulator ⚡ 邏輯門模擬器Logic Gate Simulator - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research tools. ⚗️ 酸鹼pH值計算器pHCalculator 輸入氫離子濃度或 pH，按 pH=-log₁₀[H⁺] 計算溶液酸鹼度、氫離子濃度與 pOH，用於化學實驗與水質酸鹼分析。pHCalculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Re... ⚛️ 重力勢能 E_pGravitational Potential Energy Calculator 輸入物體質量、重力加速度與高度，按重力勢能公式 E_p=mgh 計算物體相對於參考面的重力勢能大小。Gravitational Potential Energy Calculator - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Sci... 🧮 階乘計算器Factorial Calculator 計算 n! = n × (n−1) × ... × 2 × 1（支持大整數，推薦 n ≤ 10000）Factorial Calculator - calculate online, free and accurate. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scien... ☄️ 隕石撞擊坑直徑估算Meteor Crater Estimator 輸入隕石直徑、密度、撞擊速度與角度，估算撞擊坑直徑、釋放能量（以 TNT 當量計）及影響範圍，用於科普演示與天文教學。Meteor Crater Estimator - free online tool. Free online tool on ToolBox — 100% client-side, no data uploaded, no install. Part of the Scientific Research t...