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Calculators

Every calculator here computes a numeric result from the values you enter — the underlying formula is documented on the tool's page, and results update instantly as you type.

All calculators

Epoxy Resin & Mold Volume Calculator

Calculate exact epoxy resin and hardener volumes for rectangle, cylinder, and sphere molds by dimensions, with wastage allowance and mix ratio.

Crafts & Materials

Candle Wax & Fragrance Oil Calculator

Calculate wax weight, fragrance oil load, and total mix volume for soy, paraffin, beeswax, and coconut wax candles by container size and count.

Crafts & Materials

Knitting Gauge & Yardage Calculator — Adjust Any Pattern

Rescale any knitting pattern to your own gauge: exact stitches, rows, and adjusted yardage and balls of yarn from your swatch measurements.

Crafts & Materials

Date Difference Calculator — Days Between Two Dates

Calculate the exact difference between two dates: calendar years, months, and days, plus totals in days, hours, minutes, seconds, and weeks. Leap-year aware.

Time & Dates

Percentage Calculator — Percent of a Number, Percent Change & More

Calculate X% of Y, what percent one number is of another, percent change between two values, and increases or decreases by a percentage. Free, instant, browser-based.

Math

Number Base Converter — Binary, Octal, Decimal & Hex

Convert any number between binary, octal, decimal, and hexadecimal instantly. Supports every input base from 2 to 36, negative numbers, and fractions. Free, instant, browser-based.

Math

Coffee to Water Ratio Calculator — Grams per Cup & Brew Methods

Calculate the coffee-to-water ratio: how many grams of coffee for any number of cups, water volume, or coffee weight, with presets for pour-over, French press, Aeropress, Chemex, cold brew, and espresso.

Cooking & Baking

Roman Numeral Converter — Numbers to Roman Numerals & Back

Convert any whole number from 1 to 3999 to its standard Roman numeral and back instantly — MMXXIV, MCMXC, MMMCMXCIX. Non-standard spellings are caught and corrected. Free, instant, browser-based.

Math

Business Days Calculator — Count Weekdays & Add Working Days

Count the business days between two dates, or add and subtract working days from any date. Weekends skipped automatically, leap-year aware, 100% free, browser-based.

Time & Dates

Age Calculator — Exact Years, Months & Days

Calculate an exact age in years, months, and days between any two dates — or today. Leap-year aware, with totals in days and weeks. Free, instant, browser-based.

Time & Dates

Paint Calculator — How Much Paint Do I Need?

Estimate gallons or liters of paint for a single wall or a whole room by dimensions, subtracting doors and windows with coats and wastage built in.

Home & DIY

Tile & Flooring Calculator — How Many Tiles Do I Need?

Estimate the exact number of tiles and boxes for any room by floor area, tile size (square or rectangular, inches or centimeters), and wastage allowance.

Home & DIY

Oven Temperature Converter — °F, °C & Gas Mark

Convert oven temperatures instantly between Fahrenheit, Celsius, and UK gas marks, with a gas mark chart and common baking temperature table.

Cooking & Baking

Recipe Scaler — Double, Halve, or Resize Any Recipe

Scale any recipe to any number of servings instantly. Multiply every ingredient by the servings ratio and get clean kitchen fractions like 2½ cups — 100% client-side.

Cooking & Baking

Fraction Calculator — Add, Subtract, Multiply & Divide

Add, subtract, multiply, and divide fractions, simplify them, and convert decimals to fractions — with mixed numbers and lowest-term results.

Math

Expense Split Calculator — Split Costs & Settle Up

Split a shared bill equally among a group and see exactly who pays whom. Enter what each member paid to get the total, the even share, and a settlement plan instantly.

Math

Cooking Measurement Converter — Cups to Grams & More

Convert cups to grams (and back) for flour, sugar, butter, honey, and more — plus tablespoons, teaspoons, milliliters, and fluid ounces. 100% client-side.

Cooking & Baking

Discount Calculator — Sale Price, Percent Off & Savings

Calculate the sale price after any discount: take a percent or a fixed amount off, reverse a discount to find the original price, and see exactly how much you save. Free, instant, browser-based.

Math

Tip Calculator — Tip Amount, Total & Per-Person Split

Calculate the tip on any bill: quick 10–25% presets or a custom rate, the total with gratuity, and an exact per-person split. Free, instant, browser-based.

Math

Looking for a converter?

Utilities that transform data rather than compute a number — like encoders and formatters — live on the Tools page.