Calculators
16 free tools in this category. Pick one to get started.
Tip Calculator
Calculate how much to tip and split the bill between any number of people. Free and instant.
Age Calculator
Calculate your exact age in years, months, days, hours, and minutes. Find out what day you were born on.
GPA Calculator
Weight courses by credit hours and grade points to project semester and cumulative GPA outcomes.
Average Calculator
Find the arithmetic mean of any list of numbers with optional trimming for grades and datasets.
Median Calculator
Sort values and compute the median—even for even-length sets—for statistics and reporting.
Square Root Calculator
Evaluate √x, including perfect squares and irrationals, for geometry, signal processing, and homework.
Scientific Notation Calculator
Normalize very large or small numbers to a × 10ⁿ form for chemistry, physics, and engineering.
Percent Error Calculator
Compare experimental vs theoretical values to quantify accuracy in labs and calibration tasks.
Proportion Calculator
Solve for unknowns in ratios (a/b = c/d) for recipes, scaling blueprints, and similar triangles.
Velocity Calculator
Relate displacement, time, and constant velocity—or derive average speed—from trip segments.
Significant Figures Calculator
Round results to the correct count of sig figs after multiply/divide or add/subtract operations.
Discount Calculator
Find sale price from list price and percent off, or infer the discount rate from before/after.
Markup Calculator
Compute selling price, cost, or markup percentage for retail pricing and margin planning.
Overtime Calculator
Estimate gross pay with regular and overtime hourly rates based on hours worked in a week.
Sales Tax Calculator
Add or remove tax from totals when rates differ by city, county, or special district.
Syllable Counter
Estimate syllables per word or line for poetry, readability scoring, and speech pacing.