55 stateless calculators for AI agents: loans and mortgage amortization, income and sales tax, retirement and FIRE, BMI and health, date and planning, and unit conversions, returned as clean JSON. Nothing is stored. Part of FreeDailyPro's 211+ MCP tools; trial key with 20,000 calls/month at freedailypro.com/developers.
Scored across 66 tools
Several clusters have unclear boundaries: convert_length/convert_temperature/convert_weight duplicate the generic converters_units; calculate_compound_interest overlaps converters_loan_interest; calculate_loan overlaps converters_amortization, converters_mortgage, and converters_refinance; and calculate_sales_tax overlaps converters_vat_gst and converters_vat_rates. There are also near-duplicate countdown tools (converters_countdown, planning_travel_countdown) and body-composition ones (calculate_bmi, calculate_bmr, converters_tdee, estimate_body_fat). Descriptions differentiate many of them, but an agent must read carefully to avoid misselection.
There is a prefix-based pattern (calculate_*, converters_*, convert_*, planning_*), but the prefixes are applied arbitrarily: 'converters_' is used as a catch-all bucket for mortgages, taxes, retirement, and Roman numerals, while 'convert_*' covers actual unit conversion which also lives under converters_units. Bare names like percentage, scale_recipe, and estimate_body_fat break the pattern further.
66 tools is far beyond a comfortable surface, and the count is inflated by redundancies (three unit-conversion tools plus a general one, multiple overlapping loan/interest calculators). While each calculator is a distinct domain artifact, the sheer breadth forces an agent to search rather than choose.
Coverage of finance, tax (US/UK/India), retirement, health, unit, and event-planning calculators is broad, with few obvious missing domains beyond general math/date utilities. However, the surface is uneven — heavily redundant in loans, taxes, and conversions while thin in pure math and date/time, and the planner tools are generate-only with no retrieval or editing counterparts.
Age calculator — years/months/days between dates
Inputs: startDate (required), endDate.
Bmi calculator
Inputs: height (required), weight (required), unit.
Bmr calorie calculator — Mifflin-St Jeor + TDEE
Inputs: sex (required), ageYears (required), heightCm (required), weightKg (required), +1 more.
Compound interest calculator
Inputs: years (required), principal (required), annualRatePercent (required), frequency, +1 more.
Discount calculator
Inputs: originalPrice (required), salePrice, discountPercent.
Gpa calculator
Inputs: courses (required), scale.
Ideal weight calculator
Inputs: sex (required), heightCm (required).
Loan calculator — EMI / amortizing loan, with an optional first payment date that dates the schedule preview and gives the payoff date
Inputs: years (required), principal (required), annualRatePercent (required), previewMonths, +1 more.
Pregnancy due date calculator — Naegele rule
Inputs: lastMenstrualPeriod (required), referenceDate.
Sales tax calculator with US state base-rate lookup (local rates excluded) — add or extract tax
Inputs: zip, mode, items, state, +5 more.
Simple interest calculator
Inputs: years (required), principal (required), annualRatePercent (required), startDate.
Sip calculator — systematic investment plan future value
Inputs: years (required), annualRatePercent (required), monthlyInvestment (required), startDate.
Tip calculator
Inputs: bill (required), tipPercent (required), people.
Water intake calculator
Inputs: weightKg (required), activityLevel.
401(k) projection with the 2026 IRS contribution limits
Inputs: years (required), currentBalance (required), annualContribution (required), age, +4 more.
529 calculator
Inputs: years (required), currentBalance (required), monthlyContribution (required), expectedReturnPct, +1 more.
Home affordability and debt-to-income calculator: maximum home price at the 28/36 guideline and 31/43 stretch limits
Inputs: ratePct (required), vaUse, years, loanType, +12 more.
Loan amortization schedule with optional payment dates and step-by-step working
Inputs: months (required), principal (required), annualRatePct (required), firstPaymentDate.
College cost calculator
Inputs: years (required), annualCost (required), startDate, inflationPct.
Retirement and HSA contribution limits by tax year: 401(k), SIMPLE, IRA, Roth phase-out and HSA
Inputs: age, magi, taxYear, hsaCoverage, +2 more.
Countdown calculator
Inputs: isoTarget (required), fromIso.
Debt payoff planner: avalanche and snowball plans with payoff dates, interest and a minimums-only baseline
Inputs: debts (required), strategy, startDate, extraMonthly, +1 more.
Exchange rates: daily reference rates for about 200 currencies, crypto and metals, with ECB fallback and ECB history (reference rates, not live)
Inputs: to, date, from, amount, +4 more.
File size converter
Inputs: to (required), from (required), value (required).
FIRE calculator
Inputs: annualSpend (required), startDate, currentSavings, expectedReturnPct, +2 more.
India income tax FY 2026-27: old and new regime, standard deduction, rebate, surcharge and cess
Inputs: income (required), age, regime, itemised, +3 more.
Job experience calculator
Inputs: startIso (required), endIso, otherJobs, countEndDate.
Loan and interest calculator: loan payments, simple interest and compound interest with contributions in one endpoint
Inputs: kind (required), fee, years, payment, +16 more.
Mortgage calculator: payment with taxes, insurance, PMI and HOA, extra payments, biweekly and payoff date
Inputs: years (required), ratePct (required), homePrice (required), vaUse, +22 more.
Paycheck estimator: 2026 US federal tax, FICA, state tax and pre-tax deductions
Inputs: grossAnnual (required), state, filingStatus, stateRatePct, +5 more.
Refinance break-even calculator: simple and full-cost break-even, interest difference and horizon table
Inputs: newRatePct (required), newTermYears (required), currentBalance (required), currentRatePct (required), +7 more.
Retirement and FIRE projection: nest egg, sustainable income, gap and drawdown with inflation and a withdrawal rate
Inputs: currentAge (required), retirementAge (required), inflationPct, currentSavings, +8 more.
RMD estimator using the IRS Uniform Lifetime Table
Inputs: age (required), accountBalance (required), birthYear.
converters roman
Inputs: value (required), direction (required).
Self-employment tax: 2026 wage base, Medicare and Additional Medicare
Inputs: netProfit (required), asOf, state, method, +9 more.
Social Security retirement benefit estimate with 2026 bend points
Inputs: claimAge, birthYear, yearsWorked, annualEarnings, +1 more.
US state income tax with a 50-state schedule lookup
Inputs: income (required), state, ratePct, locality, +3 more.
Student loan calculator
Inputs: principal (required), annualRatePct (required), ibr, state, +7 more.
Calorie TDEE calculator
Inputs: age (required), sex (required), heightCm (required), weightKg (required), +5 more.
UK income tax and Class 1 National Insurance 2026/27 with Scottish rates
Inputs: income (required), bonus, taxCode, benefits, +4 more.
Unit converter: 14 categories and over 130 units with exact factors
Inputs: to (required), from (required), value (required), category (required).
Unit converter: the units of each category, with ids, symbols, aliases and a US, imperial or metric tag
Inputs: category.
US federal income tax estimate with 2026 brackets, filing status, deductions, FICA and state tax
Inputs: state, deduction, grossIncome, filingStatus, +4 more.
VAT and GST calculator with a country rate table
Inputs: lines, amount, country, ratePct, +2 more.
VAT and GST rates by country: standard and reduced rates with a data version and as-of date
Inputs: region, country, currency.
EU VAT number validation: layout check per member state plus a live VIES lookup
Inputs: vatNumber (required), country, offlineOnly.
Unit converter (length)
Inputs: to (required), from (required), value (required).
Unit converter (temperature)
Inputs: to (required), from (required), value (required).
Unit converter (weight)
Inputs: to (required), from (required), value (required).
Body fat calculator — US Navy style estimate
Inputs: sex (required), neckCm (required), waistCm (required), heightCm (required), +1 more.
Percentage calculator
Inputs: a (required), b (required), operation (required).
Household chore splitter
Inputs: chores (required), people (required).
Cost of living comparison
Inputs: salary (required), to, from, toIndex, +1 more.
Event budget planner
Inputs: guests (required), venue, extras, catering, +1 more.
Event checklist planner
Inputs: eventType.
Event day schedule
Inputs: items (required), startHour (required).
Grocery list planner
Inputs: items (required).
Guest list tracker
Inputs: guests (required).
Inventory tracker
Inputs: items (required).
Travel itinerary splitter
Inputs: days (required), activities (required), startDate.
Monthly budget planner
Inputs: income (required), expenses (required).
Packing list generator
Inputs: nights (required), climate (required), tripType.
Relocation checklist planner
Inputs: no named parameters.
Split bill calculator
Inputs: total (required), people (required), tipPct.
Travel countdown planner
Inputs: nights (required), climate (required), departIso (required).
Recipe scaler
Inputs: ingredients (required), targetServings (required), originalServings (required).
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211+ MCP tools for AI agents behind one API key: PDF (merge, split, compress, redact, fill forms), documents, text and developer utilities, 55 finance, tax and health calculators, plus image, audio and video conversion. Files are processed in memory and nothing is stored. Trial key with 20,000 calls/month at freedailypro.com/developers.
211+ MCP tools for AI agents behind one API key: PDF (merge, split, compress, redact, fill forms), documents, text and developer utilities, 55 finance, tax and health calculators, plus image, audio and video conversion. Files are processed in memory and nothing is stored. Trial key with 20,000 calls/month at freedailypro.com/developers.
Loan & mortgage calculator, compound interest, ROI, crypto prices, FX conversion for AI agents.
90+ pure finance calculators: loans, investing, bonds, options, tax. Stateless, stores nothing.
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