Free calculators that show their work

16 calculators. No sign-up, no ads in the way, and every answer comes with the formula and steps.

Math

Percentages, averages, fractions, and everyday arithmetic.

What is X% of Y, X is what percent of Y, and percent change.

Mean, median, mode, and standard deviation of a list of numbers.

Interest, loans, savings, and taxes.

Growth of a balance with compounding and monthly contributions, year by year.

2026 federal income tax by bracket, with effective and marginal rates.

Estimate your 2026 refund or amount owed from income, withholding, and dependents.

Tips, ages, and quick answers.

Tip amount, total, and split per person.

Exact age in years, months, and days, plus a countdown to the next birthday.

Hours, durations, and days between dates.

Add or subtract durations, or add a duration to a clock time.

Hours between two times, minus breaks, with a weekly time card and pay.

Days between two dates, business days, or a date plus or minus a span.

GPA and grade calculators.

Unweighted and weighted GPA on the 4.0 scale from letter grades and credits.

The score you need on the final exam to reach your target grade.

Overall course grade from weighted categories or points earned.

Take-home pay by state with 2026 tax tables.

Take-home pay after federal, state, Social Security, and Medicare taxes, for every state.

Plot functions and explore them interactively.

Plot several functions at once, pan and zoom, trace points, and find intercepts, extrema, and intersections.

Trig, logs, powers, and roots with a keypad, keyboard input, memory, and history.