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Convert dates between 15+ calendar systems including Gregorian, Chinese, Persian, and Japanese Era.

Parse, validate, convert, and generate cron expressions across multiple standards.

Calculate exact diagonal spans, mitered edge lengths, and miter offsets for precise angled cuts.

Optimize material usage by calculating the most efficient cutting plans for raw stock.

Enforce material grain orientation constraints for precise plywood cutting and bin packing.

Track and reuse material offcuts to minimize waste.

Adjust cutting and layout calculations by accounting for material lost to saw blade thickness (kerf).

Calculate maximum allowed video bitrates and estimated file sizes with a 10% safety margin.

Calculate optimal subtitle block distribution and timing based on speaking rate.

Compare the total cost of credit card debt transfers against staying on your current plan.

Simulate debt payoff strategies using custom priority orders.

Run precise month-by-month debt payoff simulations using the highest-interest-rate priority strategy.

Simulate debt repayment by prioritizing the smallest balances to build momentum.

Calculate exact volumes of stock solution and solvent needed for precise dilutions.

Reveal the true cost of only paying minimums on your credit card debt.

Convert liquid ratios into exact milliliter volumes based on a target total volume.

Expands RFC 5545 RRULE strings into concrete lists of occurrence dates.

Calculate exact volumes of solute and solvent needed for precise liquid dilution.

Precise IANA timezone operations including historical DST transitions, ambiguity detection, and global time synchronization.

Calculate pixel-perfect crop coordinates for any aspect ratio while preserving subject focus.

Calculate the exact number of essential oil drops needed for a specific dilution percentage in any carrier oil volume.

Convert between Field of View (degrees) and Focal Length (mm) for various sensor formats.

Calculate total desktop dimensions and coordinate offsets for multi-monitor setups.

Converts decimal pill doses into the easiest physical way to cut them.

Calculate screen pixel density (PPI), Windows scaling percentages, and physical-to-pixel conversions.

Ensures medical safety by rounding liquid doses down to the nearest syringe marking.

Calculate exact pixel stretching, aspect ratio matching, and pixel footprint when scaling resolutions.

Precision calculator for mineral concentration adjustments in distilled water.

Calculate exact liquid medication volumes based on patient weight and concentration.

Convert between musical frequencies, rhythmic durations, digital sample counts, and logarithmic amplitude levels.

Analyze tap-based rhythmic input to derive precise tempo, stability, and musical context.

Estimate your annual carbon emissions from home energy, travel, and lifestyle choices.