God. Math. Science.
One Design.

Monthly payments, interest, amortization.

Home loan with down payment.

Car loan with sales tax and trade-in.

Early payoff from an extra payment.

Fixed monthly payment for any loan.

Full month-by-month schedule.

Find the rate behind a payment.

Growth with periodic contributions.

Interest = P × R × T.

Lump sum plus monthly contributions.

Grow savings with regular deposits.

Projected balance at retirement age.

Balance with employer match.

Lump sum growth at a fixed rate.

Today's worth of a future sum.

Add or extract sales tax.

Add or extract value-added tax.

US federal tax estimate.

Hourly, monthly and annual conversion.

Sale price after a percent off.

Time to clear a balance.

Monthly debt vs. income.

APR including fees.

Return on investment.

Sales commission plus bonus.

Future cost and purchasing power.

Max home price from income.

Down payment amount and loan.

Present value of payment series.

Price of a fixed-coupon bond.

Interest-only payment & balloon.

Old vs. new mortgage breakeven.

Auto lease monthly payment.

Selling price from cost.

Affordable rent by income rule.

Monthly benefit estimate.

APY adjusted for compounding.

NPV and rough IRR.

Body Mass Index with units toggle.

Basal metabolic rate (Mifflin).

Total daily energy expenditure.

Daily calorie target for a goal.

US Navy body fat formula.

US Army circumference method.

Devine target weight.

Muscle and organ mass.

Training heart-rate zones.

Calorie split into macros.

Daily protein target.

Running pace and speed.

MET-based activity burn.

Estimate your max lift.

Blood alcohol estimate.

BSA (Mosteller).

Daily hydration target.

Fertile window forecast.

Due date and current week.

Body fat distribution risk.

Daily carb target.

Kidney function estimate.

Everyday arithmetic with keypad.

Trig, logs, powers and constants.

Percent of, increase, decrease.

Add, subtract, multiply, divide.

Random integers in a range.

Roots of ax² + bx + c.

Solve A:B = C:D.

Greatest common factor.

Least common multiple.

Sample and population stats.

Basic descriptive statistics.

nPr and nCr.

Single and two-event odds.

Sides, angles, area (SAS).

Radius, area, circumference.

a² + b² = c².

Raise a number to a power.

Volume of 3D shapes.

Area of 2D shapes.

Measured vs. true value.

Log in any base.

Nth root of a number.

Factors and prime factorization.

Round to nearest, up or down.

Slope between two points.

Distance between two points.

n! for non-negative integers.

Remainder of a ÷ b.

Numbers to and from sci notation.

Binary, octal, decimal, hex.

Solve a : b = c : d.

Nth term and series sum.

Arithmetic on a + bi.

Exact years, months, days.

Difference between dates.

Days between and countdown.

Add or subtract times.

Hours between two times.

Strong random passwords.

Roll any number of dice.

Grade point average.

Final score needed.

Length, weight, volume and more.

Tip, total and split.

Trip fuel expense.

MPG and L/100km.

Slab volume and bags.

Area of a space.

Measure tree, building & pole height with your phone.

Voltage, current, resistance.

Appliance energy cost.

Network, broadcast, hosts.

Encode or decode Base64.

Convert numbers ↔ numerals.

Wake times by sleep cycle.

Perceived cold temperature.

Playful compatibility score.

Celsius, Fahrenheit, Kelvin.

Kitchen volume units.

Check any calendar year.

Flash-to-thunder distance.

Dog years to human years.

Weekly hours and gross pay.

Hex, RGB and HSL values.

Tithe and offerings on income.

Finish all 1,189 chapters.

Temporal hours to clock time.

Years between biblical events & chronologies.

Explore the mathematics behind the fine-tuning of a life-permitting universe.