Free Productivity Tools — Quiet Tools

Calculators, planners, date tools, and financial estimators for everyday tasks. From mortgage calculations to countdown timers, everything runs privately in your browser with no accounts required.

2x2 Matrix Calculator

Calculate determinant, inverse, and multiplication for 2x2 matrices.

Age Calculator

Calculate age from a birth date in years, months, and days.

APR and APY Converter

Convert nominal APR and effective APY values.

Average Calculator

Calculate mean, median, mode, and weighted averages.

BMI Calculator

Calculate body mass index from weight and height.

BMR Calculator

Calculate basal metabolic rate from age, sex, weight, and height.

Body Fat Calculator

Estimate body fat percentage with the US Navy method.

Break-Even Calculator

Calculate break-even units from price, fixed costs, and variable costs.

Budget Planner

Build a simple budget plan from category percentages.

Business Days Calculator

Count business days between dates excluding weekends.

Calorie Needs Calculator

Estimate daily calorie needs from age, sex, height, weight, and activity.

Scientific Calculator

Run basic and scientific calculations.

Concrete Calculator

Estimate concrete volume, cubic yards, and bag counts.

Countdown Generator

Create shareable countdown text for events and deadlines.

Date Calculator

Add or subtract days, weeks, months, or years from any date.

Date Difference Calculator

Compare two dates and calculate differences.

Drywall Calculator

Estimate drywall sheets, screws, and waste.

Flooring Calculator

Estimate flooring boxes, waste, and project cost.

Fraction Calculator

Simplify fractions and perform arithmetic.

GCD and LCM Calculator

Calculate GCD and LCM for integer lists.

Geometry Calculator

Calculate measurements for circles, triangles, and rectangles.

Grade Calculator

Calculate weighted grades and target scores.

Inflation Calculator

Estimate present and future value changes.

Interest Calculator

Compare simple and compound interest results.

Investment Calculator

Model investment growth with recurring contributions.

Lighting Calculator

Estimate room lighting needs and bulb counts.

Loan Calculator

Build an amortization schedule for a loan.

Log & Exponent Calculator

Calculate logs and exponents.

Lumber Calculator

Build a lumber cut list and total board feet.

Macro Calculator

Calculate daily protein, carb, and fat targets.

Mortgage Calculator

Compare mortgage payoff with extra payments.

Mulch & Gravel Calculator

Estimate mulch or gravel volume and bags.

Running Pace Calculator

Calculate running pace, finish time, or distance.

Paint Calculator

Estimate paint gallons and project cost.

Percentage Calculator

Calculate percent of, change, and reverse.

Prime Number Calculator

Check if a number is prime and factor integers.

Quiz Generator

Turn notes into quiz questions.

Random Number Generator

Generate random integers in a range.

Ratio Calculator

Simplify ratios and calculate proportional values.

Recipe Scaler

Scale recipe ingredients to target servings.

Roofing Calculator

Estimate roofing materials and waste.

Savings Calculator

Estimate future savings value.

Stair Calculator

Calculate stair risers, treads, run, and angle.

Statistics Calculator

Calculate descriptive statistics for data.

Tile Calculator

Estimate tile count, coverage, and waste.

Time Duration Calculator

Add or subtract durations from a base time.

Time Zone Converter

Convert date and time between time zones.

Tip Calculator

Calculate tip totals and split a bill.

Unix Time Converter

Convert Unix timestamps and human dates.

Unix Timestamp

Convert Unix timestamps and human datetimes.

Water Intake Calculator

Estimate daily water intake.

Week Number Calculator

Find the ISO week number for any date.