All SpecWhale tools

Generate a modular type scale from a base size and ratio.

Convert meters to yards instantly (1 m = 1.09361 yd), free and accurate.

Convert yards to feet instantly (1 yd = 3 ft), free and accurate.

Convert inches to feet instantly (1 in = 0.0833333 ft), free and accurate.

Convert feet to inches instantly (1 ft = 12 in), free and accurate.

Convert pounds to ounces instantly (1 lb = 16 oz), free and accurate.

Convert ounces to pounds instantly (1 oz = 0.0624999 lb), free and accurate.

Convert grams to kilograms instantly (1 g = 0.001 kg), free and accurate.

Convert kilograms to grams instantly (1 kg = 1.0000e+3 g), free and accurate.

Convert liters to milliliters instantly (1 L = 1.0000e+3 mL), free and accurate.

Convert milliliters to liters instantly (1 mL = 0.001 L), free and accurate.

Convert Celsius to Kelvin instantly, free and accurate, right in your browser.

Convert Fahrenheit to Kelvin instantly, free and accurate, right in your browser.

Convert Kelvin to Fahrenheit instantly, free and accurate, right in your browser.

Convert PSI to kilopascals instantly (1 psi = 6.89476 kPa), free and accurate.

Convert kilopascals to bar instantly (1 kPa = 0.01 bar), free and accurate.

Convert joules to calories instantly (1 J = 0.239006 cal), free and accurate.

Convert horsepower to watts instantly (1 hp = 745.7 W), free and accurate.

Escape special characters so text can be used literally in a regular expression.

Add sequential line numbers to pasted text for reference or debugging.

Collapse line breaks and extra whitespace in pasted text into clean single spaces.

Reverse the character order of any text, locally in your browser.

Find items in the first list that are missing from the second list.

Find items that appear in both of two pasted lists.

Merge two pasted lists into one, removing duplicate entries.

Find words that repeat more than once in a block of pasted text.

Extract all unique object keys from JSON.

Flatten nested JSON into flat dot-path keys for easier diffing or export.

Encode or decode Base64URL strings locally.

Convert text to hexadecimal character codes.

Convert hexadecimal character codes back to text.

Extract all http/https URLs found in a block of pasted text.

Extract email addresses from pasted text.

Remove HTML tags and keep readable text.

Search common DNS record types and what they are used for.

Search common HTTP request and response headers.

Search common HTML entities and characters.

Search useful CSS named colors and hex values.

Search common keyboard keys and browser key values.

Search common ISO 639-1 language codes and their English names.

Search common time-zone abbreviations and offsets.

Search common file extensions, MIME types, and descriptions.

Search common Unicode symbols for writing and UI work.

Search common network port numbers and services.

Find the ordinal day number for any date.

Find the calendar quarter (Q1-Q4) and month number for any date.

Find the next weekday after a selected date.

Estimate work hours between dates from weekdays and hours per day.

Calculate days until the next birthday from a birth date.

Find fiscal quarter from a date and fiscal year start month.

Calculate conversion rate from visitors and conversions.

Calculate average order value from revenue and order count.

Estimate customer lifetime value from order value, purchase frequency, and lifespan.

Calculate customer churn rate for a period.

Estimate runway from cash balance and monthly burn.

Calculate monthly recurring revenue from customers and average monthly price.

Calculate inventory turnover from cost of goods sold and average inventory.

Estimate reorder point from daily demand, lead time, and safety stock.

Calculate debt-to-income ratio from monthly debt and gross monthly income.

Estimate emergency fund target from monthly expenses and months saved.