教育

Free ACT Score Calculator — calculate your ACT composite score, section percentile ranks, SAT equivalent, STEM score, and college tier benchmarks. Supports 2025 and pre-2025 formats.

Free Cubic Equation Solver — instantly find all three roots (real and complex) of any ax³ + bx² + cx + d = 0 equation with step-by-step solution, discriminant analysis, factored form, Vieta's verification, and a polynomial graph.

免费的累计平均绩点（GPA）计算器 — 跟踪您在多个学期的GPA，包括之前的学分历史，规划目标GPA，并即时可视化您的成绩分布。

Free GMAT Focus Edition Score Calculator — estimate your composite score (205–805) from Quantitative Reasoning, Verbal Reasoning, and Data Insights section scores, with full percentile rankings and school competitiveness analysis.

Free Graduate Record Examination (GRE) score calculator — instantly convert raw scores to scaled scores, look up Verbal and Quantitative percentile ranks, get an AWA percentile, see your performance tier, compare your scores to field averages, and check GMAT concordance.

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Free Linear Equation Solver — solve single-variable equations (ax + b = c), slope-intercept form (y = mx + b), two-point form, and standard form (Ax + By = C) with step-by-step solutions, line graphs, and form conversions.

Free Matrix Determinant Calculator — compute the determinant of 2x2, 3x3, 4x4, 5x5, and 6x6 matrices with step-by-step solutions using the Sarrus rule and cofactor expansion.

Free matrix inverse calculator with step-by-step Gauss-Jordan elimination and adjugate method. Supports 2×2, 3×3, 4×4, and 5×5 matrices with fraction and decimal output.

免费人口增长计算器 — 模拟指数、连续、逻辑和线性人口增长。计算最终人口、翻倍时间，并查看四种数学模型的增长时间线。

Free Potential Energy (PE) calculator for gravitational, elastic, and electric potential energy. Solve for any variable with step-by-step solutions, planet gravity presets, and multi-unit output.

免费潘尼特方格计算器，用于单基因杂交、双基因杂交和三基因杂交。即时可视化基因型和表型比例、概率百分比、合子标签和孟德尔比例。

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Free Digital SAT Score Calculator — estimate your Reading & Writing and Math scaled scores (200–800 each) and composite score (400–1600) from raw module answers. Includes percentile ranks, ACT concordance, college tier benchmarks, superscore calculator, and target score gap analysis.

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Free Velocity Calculator — solve for velocity, distance, time, acceleration, or displacement using the four core physics equations: basic speed (v=d/t), kinematic v=u+at, kinematic v²=u²+2as, and average velocity. Supports metric and imperial units with multi-unit output.