usefulweb.site Everyday calculators

Everyday calculators

Percentages, dates, units, tips and other quick sums, with the working shown. · 7 tools

  • Loan Amortization Calculator

    Annuity, linear or interest-only loans: schedule, extra payments, fixed-rate balance, APR.

    JSON API · MCP

  • One-Rep-Max & Plate Loader

    1RM from any set (7 formulas + average), % and RPE tables, and which plates to load.

    JSON API · MCP

  • Percentage & Ratio Calculator

    X% of Y, % change, reverse %, percentage points, ratios and aspect ratios, with formulas.

    JSON API · MCP

  • Random Generator

    Random numbers, dice, coins, list picks, shuffles, fair teams, dates, strings and UUIDs.

    JSON API · MCP

  • Running Pace & Splits

    Pace, time or distance in km or miles, splits, race predictions, treadmill speed, laps.

    JSON API · MCP

  • Sports Travel-Fatigue Estimator

    Travel distance, time-zone jumps, rest and back-to-backs per game as a fatigue score.

    JSON API · MCP

  • Tip & Bill Split Calculator

    Tip, tax and who pays what: split a bill equally, by shares or by items, rounded up.

    JSON API · MCP

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