Use this T-Test Calculator to compare means in seconds. Enter summary stats or raw lists, pick the test type, and hit “Calculate.” Over 70 % of peer-reviewed studies rely on t-tests for initial significance checks (Student, 1908).
The tool instantly converts any mass between kilograms and pounds. Enter a value, choose the unit, and the calculator multiplies or divides by 2.2046226218—the exact ratio defined by the U.S. National Institute of Standards and Technology (NIST, 2019). One kilogram therefore equals 2.2046 lb, so your results are as precise as official standards.
Convert any decimal number—including fractions and negatives—into binary instantly by dividing the integer part by 2 and multiplying the fraction by 2 repeatedly. Computers store data as 0 and 1 because “a single byte holds 8 bits, enabling 256 distinct values” (Computer Architecture: A Quantitative Approach, 2022).
Convert millimeters to inches fast: divide by 25.4—every 1 mm equals 0.03937 in (NIST SP 811, 2020). Enter any positive mm value, pick decimal or fraction output, and hit Convert. A 57 mm entry returns 2.24 in or 2 ¼ in; 254.3 mm shows 10.012 in. Free, mobile-friendly tool—ideal for shop, lab, or class.
The Inches Calculator turns any inch-based length, area, or volume into six other units with a single click. It follows the fixed definition “1 inch = 25.4 mm” (NIST, 2019) and can display results down to 1⁄64 inch. Simply pick Length, Area, or Volume, type values like “9 ⅛” or “2 3⁄5”, choose a target unit, set fractional precision, and read both decimal and fractional answers.
Convert file size and speed to bits, divide, and you have download time. A 2 GB file over a 100 Mbps link at 85 % efficiency downloads in about 3 min 22 s. Average global fixed-broadband speed is 117 Mbps (Ookla Speedtest Global Index, 2023).
The calculator lets you plug sample numbers into Z-, t- or χ²-formulas and instantly returns the p-value so you can accept or reject your hypothesis. For example, entering X̄ = 102, μ₀ = 100, σ = 8 and n = 64 yields p ≈ 0.045, just above the standard 0.05 cutoff used in 79 % of scientific papers (Head et al., 2015).
The tool shows how much a value fell by computing rac(original – new, original) × 100. Over 70 % of enterprise KPI dashboards visualise percentage change for revenue and cost lines (Gartner, 2022).
The Hourly Salary Calculator converts any annual figure to an hourly rate (and back) using your real schedule. Enter the numbers, press calculate, and view weekly, monthly, and overtime pay instantly. Example: $80 000 over 40 hours and 50 working weeks equals $40/hour. The median U.S. wage was $23.13 per hour in 2023 (Bureau of Labor Statistics, 2024).
