Standard Calculator
Everyday arithmetic, with a little more room to think.
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Everyday math, bigger plans, and everything in between.
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54 useful calculators8 categories. All free to use.
54 calculators
Percentage Calculator
Find a percentage of any amount, instantly.
Profit Margin
Understand profit as a share of your revenue.
Work Hours Calculator
Calculate shift hours, unpaid breaks, and estimated pay, including overnight shifts.
Concrete Calculator
Estimate volume and bag count for a rectangular slab.
Loan Calculator
Estimate fixed monthly principal and interest payments and total borrowing cost.
Length Converter
Convert metric and imperial lengths, from millimeters to miles.
Dimensional Weight Calculator
Compare actual weight with volumetric weight using your carrier’s divisor.
CBM Calculator
Find carton volume in cubic meters and cubic feet, including quantities.
Compound Interest Calculator
Explore growth with monthly contributions and a clearly defined compounding schedule.
Age Calculator
Calculate calendar age in years, months, and days on a date you choose.
Currency Converter
Convert with your explicit exchange rate and inspect the rounding. No hidden or invented market rate.
Profit Projection Calculator
Model monthly revenue, variable costs, fixed costs, and cumulative operating surplus.
Time Zone Converter
Convert a dated local time between IANA time zones, with explicit daylight-saving choices.
Aspect Ratio Calculator
Simplify image dimensions and resize a design without changing its proportions.
Bonsai & Terrarium Substrate Mix Quantities
Scale your chosen three-component mix and see the volume required for each material.
Break-Even Calculator
Know how many sales cover your fixed and variable costs.
Collectible Sale Net Proceeds & ROI
See what a card or collectible sale leaves after purchase, grading, shipping and fees.
Contractor Rate
Build a rate around your income, overhead, and billable time.
Contribution Margin & Discount Calculator
Compare contribution per unit before and after a discount, and the extra sales needed to retain it.
CPC Calculator
Find average cost per click and click-through rate for a campaign.
CPM Calculator
Work out advertising cost per thousand impressions from spend and reach.
Curiosity Scale & Repeat-Unit Calculator
Turn a stated length and repeat-unit assumption into a transparent scale comparison.
Data Size Converter
Convert bits, bytes, decimal storage units, and binary memory units.
Days Between Dates
Count days, weeks, and weekdays between two calendar dates.
Discount Calculator
Calculate a sale price, savings, and optional sales tax.
Employee Cost
Estimate total compensation cost using your own assumptions.
EV Trip Energy & Charging Scenario
Estimate trip energy, a reserve, grid energy, and a charging-time lower bound.
Fixed Payment Debt Payoff Scenario
Compare a monthly payment with modeled interest and inspect the repayment schedule.
Fraction Calculator
Add, subtract, multiply, and divide exact fractions.
Gravel Calculator
Estimate gravel volume, weight, and bag quantities.
Markup Calculator
Turn your cost and target markup into a selling price.
Measured Server Capacity Planner
Turn measured safe capacity into server counts, headroom, reserve and monthly cost.
Mining Revenue & Electricity Scenario
Test an entered daily-revenue assumption against power, fees, uptime and equipment cost.
Paint Calculator
Plan paint quantities from area, coverage, and coats.
Percentage Change
Measure the increase or decrease between two values.
Quadratic Equation
Solve ax² + bx + c = 0, including complex roots.
Ratio Simplifier
Reduce a whole-number ratio to its simplest form.
Reading Time Calculator
Estimate reading or speaking time from word count and your chosen pace.
Road Trip Fuel & Cost Calculator
Plan fuel, detours and trip cost with explicit US or Imperial gallon conventions.
ROI Calculator
Compare total cost and return to calculate profit and return on investment.
Salary to Hourly
Convert annual salary to an equivalent hourly rate.
Sales Tax
Add a tax rate or find the tax inside a total.
Savings Goal & Monthly Deposit Planner
Model progress toward a goal with explicit deposits, interest and a bounded horizon.
Savings Goal Calculator
Find the monthly amount needed to reach a goal by your chosen time horizon.
Scientific Calculator
Powers, roots, logarithms, and trigonometry in one place.
Simple Interest Calculator
Calculate interest applied only to the original principal.
Solar Panels & Battery Scenario
Convert a daily energy goal into illustrative panel and storage quantities.
Speed Converter
Convert km/h, mph, meters per second, feet per second, and knots.
Statistics Calculator
Find the mean, median, spread, and more for a data set.
Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin with the correct scale offsets.
Tile Calculator
Estimate tiles and full boxes, with a waste allowance.
Tip & Bill Split Calculator
Calculate a tip, split the total, and see a practical cent-based payment split.
Weight Converter
Convert grams, kilograms, pounds, ounces, and metric tonnes.
Every tool is free. Formulas and assumptions are included.
Working on something a little bigger?
Bring mixed cartons together in the shipping workbench. Compare, import, and export in one place.