SmartTools
70+ free calculators and unit converters for finance, health, travel and everyday math
Collection of calculators and converters covering units (length, weight, temperature, area, volume, speed, pressure, energy, data, time), finance (loans, mortgages, compound interest, VAT, tips, discounts, salary), health (BMI, body fat, ideal weight, pregnancy due date), and utilities (age, date math, aspect ratio, statistics, fractions, triangles, running pace, subnets, colors, GPA, scientific expressions).
Try asking Muse: "How much will my monthly mortgage payment be if I buy a 300,000 dollar house at 6 percent interest over 30 years?"
Source: Found in the official MCP Registry (io.github.9thShini/smart-tools) · First listed September 25, 2026
Last 24 hours
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Is it safe to connect?
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How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://smart-tools.xyz/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 764ms. Worked in 100% of checks over 30 days.
Screening · September 25, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 40
length_converterConvert a value between length units. Units: km (Kilometer), m (Meter), cm (Centimeter), mm (Millimeter), µm (Micrometer), mi (Mile), yd (Yard), ft (Foot), in (Inch), nmi (Nautical mile). Calculation runs on smart-tools.xyz.weight_converterConvert a value between weight units. Units: t (Tonne), kg (Kilogram), g (Gram), mg (Milligram), lb (Pound), oz (Ounce), st (Stone). Calculation runs on smart-tools.xyz.temperature_converterConvert a value between temperature units. Units: °C (Celsius), °F (Fahrenheit), K (Kelvin), °R (Rankine). Calculation runs on smart-tools.xyz.area_converterConvert a value between area units. Units: km² (Square kilometer), m² (Square meter), cm² (Square centimeter), mm² (Square millimeter), ha (Hectare), ac (Acre), mi² (Square mile), ft² (Square foot), yd² (Square yard), in² (Square inch). Calculation runs on smart-tools.xyz.volume_converterConvert a value between volume units. Units: m³ (Cubic meter), L (Liter), mL (Milliliter), gal_us (US gallon), gal_uk (UK gallon), qt (US quart), pt_us (US pint), pt_uk (UK pint), cup (US cup), fl oz (US fluid ounce). Calculation runs on smart-tools.xyz.speed_converterConvert a value between speed units. Units: m/s (Meter per second), km/h (Kilometer per hour), mph (Mile per hour), ft/s (Foot per second), kn (Knot). Calculation runs on smart-tools.xyz.pressure_converterConvert a value between pressure units. Units: Pa (Pascal), kPa (Kilopascal), hPa (Hectopascal), bar (Bar), atm (Atmosphere), psi (Pound per sq inch), mmHg (Millimeter of mercury), inHg (Inch of mercury). Calculation runs on smart-tools.xyz.angle_converterConvert a value between angle units. Units: ° (Degree), rad (Radian), grad (Gradian), mrad (Milliradian), rev (Turn), ′ (Arcminute), ″ (Arcsecond). Calculation runs on smart-tools.xyz.energy_converterConvert a value between energy units. Units: J (Joule), kJ (Kilojoule), cal (Calorie), kcal (Kilocalorie), Wh (Watt-hour), kWh (Kilowatt-hour), BTU (British thermal unit), ft·lb (Foot-pound), eV (Electronvolt). Calculation runs on smart-tools.xyz.data_converterConvert a value between data units. Units: bit (Bit), B (Byte), kB (Kilobyte), MB (Megabyte), GB (Gigabyte), TB (Terabyte), KiB (Kibibyte), MiB (Mebibyte), GiB (Gibibyte), TiB (Tebibyte). Calculation runs on smart-tools.xyz.time_converterConvert a value between time units. Units: µs (Microsecond), ms (Millisecond), s (Second), min (Minute), h (Hour), d (Day), wk (Week), mo (Month), yr (Year). Calculation runs on smart-tools.xyz.loan_calculatorMonthly payment, total repayment and interest for an amortising loan (annuity formula). Runs on smart-tools.xyz.mortgage_calculatorMonthly mortgage payment including optional down payment, property tax and insurance (PITI). Runs on smart-tools.xyz.compound_interest_calculatorFuture balance and interest earned: A = P(1 + r/n)^(nt). Runs on smart-tools.xyz.vat_calculatorAdd VAT to a net amount or remove it from a gross amount. Runs on smart-tools.xyz.tip_calculatorTip amount, total and per-person split for a bill. Runs on smart-tools.xyz.discount_calculatorFinal price after one or two successive discounts, plus amount saved. Runs on smart-tools.xyz.percentage_calculatorPercentage operations. operation=percent_of: a% of b. operation=is_what_percent: a is what % of b. operation=change: percent change from a to b. Runs on smart-tools.xyz.salary_calculatorConvert pay between hourly, daily, weekly, biweekly, monthly and annual. Runs on smart-tools.xyz.margin_calculatorProfit, margin (share of price) and markup (share of cost) from cost and selling price. Runs on smart-tools.xyz.unit_price_calculatorCompare price per unit of two packs and report which is cheaper. Runs on smart-tools.xyz.fuel_cost_calculatorFuel needed and trip cost. system=metric: distance km, consumption L/100km. system=imperial: distance miles, consumption mpg. Runs on smart-tools.xyz.electricity_cost_calculatorRunning cost of an appliance per day, month and year from its wattage. Runs on smart-tools.xyz.bmi_calculatorBody Mass Index and category. system=metric: weight_kg, height_cm. system=imperial: weight_lb, height_ft (+height_in). Runs on smart-tools.xyz.bmr_calculatorBasal metabolic rate (Mifflin–St Jeor) and daily calories (TDEE = BMR × activity). Runs on smart-tools.xyz.body_fat_calculatorBody fat percentage by the US Navy (Hodgdon–Beckett) method, metric measurements in cm. Females require hip_cm. Runs on smart-tools.xyz.ideal_weight_calculatorHealthy weight range (BMI 18.5–24.9) plus Devine, Robinson, Miller and Hamwi formula estimates, from height in cm. Runs on smart-tools.xyz.due_date_calculatorEstimated due date by Naegele's rule (+280 days from last period, adjusted for cycle length). Runs on smart-tools.xyz.age_calculatorExact age in years, months and days between a birth date and a reference date (default: today). Runs on smart-tools.xyz.date_difference_calculatorDifference between two dates: calendar years/months/days, total days, weeks and weekday count. Runs on smart-tools.xyz.hours_calculatorTime worked between two clock times (handles overnight), minus a break, with optional pay. Times as HH:MM. Runs on smart-tools.xyz.aspect_ratio_calculatorSimplify a width×height ratio and scale to a new width or height. Runs on smart-tools.xyz.standard_deviation_calculatorMean, variance and standard deviation (both sample and population) of a list of numbers. Runs on smart-tools.xyz.fraction_calculatorExact arithmetic on two fractions (a/b op c/d), reduced to lowest terms. op is one of + - * /. Runs on smart-tools.xyz.triangle_calculatorSolve a triangle. mode=sss: three sides a,b,c. mode=sas: two sides a,b and the included angle angle_c (degrees). Returns sides, angles (degrees), area and perimeter. Runs on smart-tools.xyz.pace_calculatorRunning pace per km and per mile, plus speed, from distance and time. Runs on smart-tools.xyz.subnet_calculatorIPv4 subnet details: network, broadcast, mask, wildcard, host range and count for an IP and prefix. Runs on smart-tools.xyz.color_converterConvert a color between HEX, RGB and HSL. Accepts #hex, rgb()/rgba(), hsl()/hsla(). Runs on smart-tools.xyz.gpa_calculatorWeighted grade point average from letter grades (US 4.0 scale, +/-) or numeric grade points and credit hours. Runs on smart-tools.xyz.scientific_calculatorEvaluate a math expression with correct order of operations: + - * / % ^, parentheses, and functions (sqrt, sin, cos, tan, ln, log, exp, min, max, factorial via !). Constants pi, e. Angles in radians. Runs on smart-tools.xyz.Recent checks
Link
https://smart-tools.xyz/mcpQuestions about SmartTools in Muse
How do I connect SmartTools to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use SmartTools to help me. It is a free service with an MCP server at https://smart-tools.xyz/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is SmartTools working right now?
At the last check (September 28, 2026, 07:00 UTC) the endpoint was working, answering in 764ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is SmartTools safe to connect to Muse?
It was screened on September 25, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can SmartTools do in Muse?
It exposes 40 tools, including length_converter, weight_converter, temperature_converter, area_converter. For example, you could ask Muse: "How much will my monthly mortgage payment be if I buy a 300,000 dollar house at 6 percent interest over 30 years?"
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