Text Processing
Convert Simplified Chinese text to Traditional Chinese with OpenCC phrase conversion
simplified-to-traditional-chinese-converterMath & Numbers
Convert points earned and total points into a test score percentage, points lost, and letter grade
test-score-percentage-calculatorMath & Numbers
Calculate residuals, absolute errors, SSE, MSE, and RMSE from actual and predicted values or a linear equation
residual-calculatorMath & Numbers
Find slope, y-intercept, and line equation from two points or multiple paired observations
slope-intercept-calculatorMath & Numbers
Calculate Student t distribution PDF, CDF, tail probability, two-tail probability, and central area
t-distribution-calculatorMath & Numbers
Calculate Spearman rank correlation for paired numeric data with tied-rank handling
spearman-correlation-calculatorMath & Numbers
Calculate sample and population skewness to measure distribution asymmetry
skewness-calculatorMath & Numbers
Calculate sample standard deviation from sample variance using the n - 1 denominator
sample-standard-deviation-calculatorMath & Numbers
Calculate sample variance with the n - 1 denominator for estimating spread from a sample dataset
sample-variance-calculatorMath & Numbers
Calculate arithmetic, geometric, and Fibonacci sequences, including the nth term, the first terms, and the partial sum
sequence-calculatorAI Tools
Convert scanned or image-heavy PDFs into Markdown with OpenDataLoader hybrid OCR, with a graceful fallback when the hybrid backend is unavailable
scanned-pdf-ocr-to-markdownMath & Numbers
Round numbers to integers, decimal places, tens, or hundreds using a simple rounding mode selector
rounding-calculator