Gain Weight Calculator

{primary_keyword} | Gain Weight Calorie Surplus Planner body{font-family:Arial,Helvetica,sans-serif;background:#f8f9fa;color:#0f1a2b;margin:0;line-height:1.6;} .container{max-width:1040px;margin:0 auto;padding:20px;} h1,h2,h3{color:#004a99;margin-bottom:12px;} header{background:#fff;padding:20px;border-bottom:1px solid #dce2eb;box-shadow:0 2px 6px rgba(0,0,0,0.05);} .summary{background:#e9f2fb;padding:16px;border:1px solid #c8daef;border-radius:10px;} .loan-calc-container{background:#fff;border:1px solid #dce2eb;border-radius:12px;box-shadow:0 4px 10px rgba(0,0,0,0.06);padding:20px;margin-top:20px;} .input-group{margin-bottom:16px;} .input-group label{display:block;font-weight:600;margin-bottom:6px;color:#0f1a2b;} .input-group input,.input-group select{width:100%;padding:10px;border:1px solid #c8d2dd;border-radius:8px;font-size:15px;} .helper{font-size:12px;color:#5a6b7d;margin-top:4px;} .error{color:#c0392b;font-size:12px;margin-top:4px;display:none;} .buttons{display:flex;gap:10px;margin-top:10px;flex-wrap:wrap;} button{background:#004a99;color:#fff;border:none;border-radius:8px;padding:10px 14px;font-size:15px;cursor:pointer;} button.reset{background:#6c757d;} button.copy{background:#28a745;} .results{margin-top:18px;padding:16px;background:#f4f7fb;border:1px solid #dce2eb;border-radius:10px;} .main-result{background:#28a745;color:#fff;padding:14px;border-radius:10px;font-size:22px;font-weight:700;margin-bottom:12px;text-align:center;} .intermediate{display:flex;flex-direction:column;gap:8px;} .intermediate div{background:#fff;border:1px solid #dce2eb;border-radius:8px;padding:10px;} .table-wrap{margin-top:18px;overflow-x:auto;} table{width:100%;border-collapse:collapse;background:#fff;border:1px solid #dce2eb;border-radius:10px;overflow:hidden;} th,td{padding:10px;border:1px solid #dce2eb;text-align:left;font-size:14px;} caption{caption-side:top;font-weight:700;padding:8px 0;color:#004a99;} .chart-wrap{background:#fff;border:1px solid #dce2eb;border-radius:12px;padding:16px;margin-top:18px;box-shadow:0 2px 6px rgba(0,0,0,0.05);} #calorieChart{width:100%;height:320px;} .legend{display:flex;gap:12px;margin-top:8px;} .legend span{display:flex;align-items:center;font-size:13px;color:#0f1a2b;} .legend i{display:inline-block;width:14px;height:14px;border-radius:3px;margin-right:6px;} article section{background:#fff;margin-top:20px;padding:18px;border:1px solid #dce2eb;border-radius:12px;box-shadow:0 2px 6px rgba(0,0,0,0.05);} a{color:#004a99;text-decoration:none;} a:hover{text-decoration:underline;} footer{margin:24px 0;text-align:center;color:#5a6b7d;}

{primary_keyword} for Effective Calorie Surplus Planning

Use this {primary_keyword} to map your maintenance calories, calculate the exact surplus required to reach a target weight by a chosen date, and see daily macronutrient targets. The {primary_keyword} updates instantly and visualizes your calorie path versus maintenance so you can make confident nutrition decisions.

{primary_keyword} Inputs

Enter your present body weight in kilograms.
Please enter a valid weight above 30kg.
Desired healthy weight goal; should exceed current weight.
Target should be higher than current weight and realistic.
Height used to refine metabolic rate estimates.
Enter a realistic height between 120 and 230 cm.
Age influences basal metabolic rate.
Age must be between 15 and 80.
Male Female
Needed for Mifflin-St Jeor calculation.
Please select sex.
Sedentary (1.2) Light (1.375) Moderate (1.55) Active (1.725) Very Active (1.9)
Higher activity raises maintenance calories.
Select an activity factor.
Number of weeks to reach your target; slower timelines are healthier.
Timeframe should be between 4 and 52 weeks.
Protein density per kilogram of body weight.
Protein target must be between 1.2 and 2.5 g/kg.
Minimum dietary fat to support hormones.
Fat target must be between 0.5 and 1.5 g/kg.
Daily Surplus: 0 kcal
Maintenance Calories: — kcal/day
Planned Intake: — kcal/day
Protein Target: — g/day
Fat Target: — g/day
Carb Target: — g/day
Expected Weekly Gain: — kg/week
Formula: BMR (Mifflin-St Jeor) multiplied by activity level gives maintenance. Surplus = (target-current) * 7700 kcal / days. Planned intake = maintenance + surplus. Protein and fat are set by body weight; carbs fill remaining calories at 4 kcal/g.
Projected Weekly {primary_keyword} Metrics
WeekProjected Weight (kg)Daily CaloriesWeekly Surplus (kcal)
Planned Intake Maintenance
Chart: {primary_keyword} visual showing planned calorie intake compared to maintenance across your chosen timeframe.

What is {primary_keyword}?

The {primary_keyword} is a structured method to calculate how many calories you need above maintenance to gain lean mass at a controlled pace. People looking to add healthy weight, athletes entering a strength cycle, and underweight individuals guided by clinicians should use the {primary_keyword} to avoid guesswork and excess fat gain.

Common misconceptions about a {primary_keyword} include believing any calorie surplus works the same, assuming protein alone drives gains, or thinking rapid weekly jumps are sustainable. The {primary_keyword} clarifies a balanced surplus tied to time, training load, and macronutrient distribution.

Use the {primary_keyword} when you want predictability, you need accountability, and you want to align nutrition with recovery. Repeatedly checking the {primary_keyword} prevents accidental undereating or extreme bulking.

Reference internal guides like {related_keywords} for deeper nutrition pairing within the {primary_keyword} strategy.

{primary_keyword} Formula and Mathematical Explanation

The {primary_keyword} relies on the Mifflin-St Jeor equation for basal metabolism, scaled by activity, and then adds a caloric surplus based on the energy cost of tissue gain. The {primary_keyword} also sets macronutrient minimums to preserve lean tissue and hormone balance.

Steps in the {primary_keyword}: calculate BMR, multiply by activity to get maintenance, determine weight to gain, convert that to energy using 7700 kcal per kilogram, spread the surplus over total days, and add macronutrient targets. By repeating the {primary_keyword} each week, you fine-tune intake as body mass changes.

{primary_keyword} Variables
VariableMeaningUnitTypical Range
Current WeightStarting body masskg45-120
Target WeightGoal masskg50-140
HeightBody heightcm150-200
Activity FactorMovement multiplierdimensionless1.2-1.9
TimeframePlan lengthweeks4-52
Protein RateProtein per kgg/kg1.2-2.5
Fat RateFat per kgg/kg0.5-1.5

Cross-reference with {related_keywords} to align {primary_keyword} protein timing with training.

Practical Examples (Real-World Use Cases)

Example 1: Alex weighs 70 kg, stands 175 cm, is 28 years old, male, moderately active (1.55), and wants to reach 78 kg in 12 weeks. The {primary_keyword} shows a maintenance of about 2550 kcal/day. Needed gain is 8 kg, equating to 61600 kcal. Over 84 days, the {primary_keyword} sets a daily surplus near 733 kcal, so total intake ~3283 kcal/day. Protein from the {primary_keyword} at 1.8 g/kg equals 126 g, fat at 0.9 g/kg equals 63 g, and remaining calories go to carbs.

Example 2: Priya weighs 55 kg, is 165 cm, 26 years old, female, lightly active (1.375), aiming for 60 kg in 16 weeks. The {primary_keyword} calculates maintenance near 1900 kcal/day. Gain of 5 kg requires 38500 kcal. Spread across 112 days, the {primary_keyword} surplus is about 344 kcal/day, leading to 2244 kcal intake. Protein at 1.8 g/kg is 99 g, fat at 0.9 g/kg is 50 g. This {primary_keyword} keeps weight gain steady without excessive fat.

For macro cycling, check {related_keywords} to pair the {primary_keyword} with training blocks.

How to Use This {primary_keyword} Calculator

Step 1: Enter current weight, target weight, height, age, and sex into the {primary_keyword}. Step 2: Choose your activity factor. Step 3: Set timeframe and protein/fat targets. Step 4: Watch the {primary_keyword} results update instantly. Step 5: Adjust targets if the {primary_keyword} shows an aggressive surplus. Step 6: Copy results to share with a coach.

Read the {primary_keyword} outputs: the main result is daily surplus, intermediate lines show maintenance calories, total planned intake, macro grams, and expected weekly gain. The chart compares planned intake against maintenance so you can judge feasibility. Use the table to track week-by-week outcomes generated by the {primary_keyword}.

For performance peaks, use {related_keywords} alongside this {primary_keyword}.

Key Factors That Affect {primary_keyword} Results

1) Activity accuracy: Understating movement lowers maintenance, skewing the {primary_keyword} surplus. 2) Timeframe: Short timelines spike surplus; the {primary_keyword} encourages gradual gains. 3) Protein sufficiency: The {primary_keyword} fixes minimums to support muscle protein synthesis. 4) Fat intake: Adequate fats keep hormones stable; the {primary_keyword} guards against low-fat mistakes. 5) Carb allocation: Remaining calories should support training; the {primary_keyword} balances carbs after protein and fat. 6) Sleep and stress: Recovery alters weight trends; adjust the {primary_keyword} if gains stall. 7) Digestive tolerance: Large surpluses can bloat; the {primary_keyword} helps moderate increases. 8) Measurement consistency: Weigh at the same time daily so the {primary_keyword} projections remain accurate.

Review nutrition periodization via {related_keywords} to complement the {primary_keyword} output.

Frequently Asked Questions (FAQ)

Is the {primary_keyword} safe for fast weight gain? The {primary_keyword} recommends moderate surpluses to limit fat gain; consult a clinician for medical conditions.

How often should I recalc? Update the {primary_keyword} weekly as weight changes to keep surpluses accurate.

Can I use pounds? Convert to kilograms before using the {primary_keyword} for best precision.

Does the {primary_keyword} include training effects? It factors activity level but assumes consistent training volume.

What if I miss targets? Re-run the {primary_keyword} and extend the timeframe to reduce daily surplus.

Does protein timing matter? Yes; align protein evenly across meals while keeping the {primary_keyword} daily total.

Can vegetarians use this? The {primary_keyword} works for any diet; adjust protein sources accordingly.

Will water weight skew results? Short-term shifts happen, but the {primary_keyword} focuses on weekly averages.

Explore structured meal plans linked through {related_keywords} to pair with the {primary_keyword} recommendations.

Related Tools and Internal Resources

Use this {primary_keyword} regularly to guide smart, sustainable mass gain.

var chartCtx = null; var chartCanvas = null; function initChart(){ chartCanvas = document.getElementById("calorieChart"); if(chartCanvas && chartCanvas.getContext){ chartCtx = chartCanvas.getContext("2d"); } } function clearChart(){ if(!chartCtx){return;} chartCtx.clearRect(0,0,chartCanvas.width,chartCanvas.height); } function drawChart(intakeData, maintenanceData){ if(!chartCtx){return;} clearChart(); var width = chartCanvas.width = chartCanvas.clientWidth; var height = chartCanvas.height = 320; var padding = 40; var maxVal = 0; var minVal = 999999; var i; for(i=0;imaxVal){maxVal=intakeData[i];} if(maintenanceData[i]>maxVal){maxVal=maintenanceData[i];} if(intakeData[i]<minVal){minVal=intakeData[i];} if(maintenanceData[i]<minVal){minVal=maintenanceData[i];} } if(maxVal===0){maxVal=1;} var yScale = (height-2*padding)/(maxVal-minVal); var xScale = (width-2*padding)/(intakeData.length-1||1); chartCtx.strokeStyle="#dce2eb"; chartCtx.beginPath(); chartCtx.moveTo(padding,padding); chartCtx.lineTo(padding,height-padding); chartCtx.lineTo(width-padding,height-padding); chartCtx.stroke(); chartCtx.fillStyle="#5a6b7d"; chartCtx.font="12px Arial"; chartCtx.fillText("Calories",padding+4,padding-8); chartCtx.fillText("Days",width-padding-30,height-padding+20); chartCtx.strokeStyle="#004a99"; chartCtx.lineWidth=2; chartCtx.beginPath(); for(i=0;i<intakeData.length;i++){ var x = padding + xScale*i; var y = height-padding – (intakeData[i]-minVal)*yScale; if(i===0){chartCtx.moveTo(x,y);}else{chartCtx.lineTo(x,y);} } chartCtx.stroke(); chartCtx.strokeStyle="#28a745"; chartCtx.beginPath(); for(i=0;i<maintenanceData.length;i++){ var x2 = padding + xScale*i; var y2 = height-padding – (maintenanceData[i]-minVal)*yScale; if(i===0){chartCtx.moveTo(x2,y2);}else{chartCtx.lineTo(x2,y2);} } chartCtx.stroke(); } function setError(id, condition, message){ var el = document.getElementById(id); if(!el){return;} if(condition){ el.style.display="block"; el.innerText=message; }else{ el.style.display="none"; } } function updateCalc(){ var cw = parseFloat(document.getElementById("currentWeight").value); var tw = parseFloat(document.getElementById("targetWeight").value); var h = parseFloat(document.getElementById("height").value); var a = parseFloat(document.getElementById("age").value); var sex = document.getElementById("sex").value; var activity = parseFloat(document.getElementById("activity").value); var weeks = parseFloat(document.getElementById("timeframe").value); var pr = parseFloat(document.getElementById("proteinRate").value); var fr = parseFloat(document.getElementById("fatRate").value); var valid = true; if(isNaN(cw)||cw<30){setError("errorCurrentWeight",true,"Please enter a valid weight above 30kg.");valid=false;}else{setError("errorCurrentWeight",false,"");} if(isNaN(tw)||tw<=cw){setError("errorTargetWeight",true,"Target should be higher than current weight and realistic.");valid=false;}else{setError("errorTargetWeight",false,"");} if(isNaN(h)||h230){setError("errorHeight",true,"Enter a realistic height between 120 and 230 cm.");valid=false;}else{setError("errorHeight",false,"");} if(isNaN(a)||a80){setError("errorAge",true,"Age must be between 15 and 80.");valid=false;}else{setError("errorAge",false,"");} if(!sex){setError("errorSex",true,"Please select sex.");valid=false;}else{setError("errorSex",false,"");} if(isNaN(activity)||activity<1.1){setError("errorActivity",true,"Select an activity factor.");valid=false;}else{setError("errorActivity",false,"");} if(isNaN(weeks)||weeks52){setError("errorTimeframe",true,"Timeframe should be between 4 and 52 weeks.");valid=false;}else{setError("errorTimeframe",false,"");} if(isNaN(pr)||pr2.5){setError("errorProteinRate",true,"Protein target must be between 1.2 and 2.5 g/kg.");valid=false;}else{setError("errorProteinRate",false,"");} if(isNaN(fr)||fr1.5){setError("errorFatRate",true,"Fat target must be between 0.5 and 1.5 g/kg.");valid=false;}else{setError("errorFatRate",false,"");} if(!valid){return;} var bmr = 10*cw + 6.25*h – 5*a + (sex==="male"?5:-161); var maintenance = bmr * activity; var gainKg = tw – cw; var days = weeks*7; var totalEnergy = gainKg * 7700; var dailySurplus = totalEnergy / days; var totalIntake = maintenance + dailySurplus; if(totalIntake<maintenance){totalIntake=maintenance;} var proteinG = pr * tw; var fatG = fr * tw; var proteinCals = proteinG*4; var fatCals = fatG*9; var carbCals = totalIntake – (proteinCals + fatCals); if(carbCals<0){carbCals=0;} var carbG = carbCals/4; var weeklyGain = dailySurplus*7/7700; document.getElementById("mainResult").innerText="Daily Surplus: "+Math.round(dailySurplus)+" kcal"; document.getElementById("maintenanceDisplay").innerText="Maintenance Calories: "+Math.round(maintenance)+" kcal/day"; document.getElementById("totalCaloriesDisplay").innerText="Planned Intake: "+Math.round(totalIntake)+" kcal/day"; document.getElementById("proteinDisplay").innerText="Protein Target: "+Math.round(proteinG)+" g/day"; document.getElementById("fatDisplay").innerText="Fat Target: "+Math.round(fatG)+" g/day"; document.getElementById("carbDisplay").innerText="Carb Target: "+Math.round(carbG)+" g/day"; document.getElementById("weeklyGainDisplay").innerText="Expected Weekly Gain: "+weeklyGain.toFixed(2)+" kg/week"; renderTable(cw, gainKg, weeks, Math.round(totalIntake), Math.round(maintenance), dailySurplus); var intakeSeries = []; var maintenanceSeries = []; var di; for(di=0;di<days;di++){ intakeSeries.push(totalIntake); maintenanceSeries.push(maintenance); } drawChart(intakeSeries, maintenanceSeries); } function renderTable(startWeight, gainKg, weeks, intake, maintenance, surplus){ var body = document.getElementById("projectionBody"); body.innerHTML=""; var weeklyGain = (gainKg/weeks); var i; for(i=1;i<=weeks;i++){ var tr = document.createElement("tr"); var weekWeight = startWeight + weeklyGain*i; var weeklySurplus = Math.round(surplus*7); tr.innerHTML="Week "+i+""+weekWeight.toFixed(2)+""+intake+" kcal"+weeklySurplus+" kcal"; body.appendChild(tr); } } function resetForm(){ document.getElementById("currentWeight").value=70; document.getElementById("targetWeight").value=78; document.getElementById("height").value=175; document.getElementById("age").value=28; document.getElementById("sex").value="male"; document.getElementById("activity").value="1.55″; document.getElementById("timeframe").value=12; document.getElementById("proteinRate").value=1.8; document.getElementById("fatRate").value=0.9; updateCalc(); } function copyResults(){ var text = ""; text += document.getElementById("mainResult").innerText+"\n"; text += document.getElementById("maintenanceDisplay").innerText+"\n"; text += document.getElementById("totalCaloriesDisplay").innerText+"\n"; text += document.getElementById("proteinDisplay").innerText+"\n"; text += document.getElementById("fatDisplay").innerText+"\n"; text += document.getElementById("carbDisplay").innerText+"\n"; text += document.getElementById("weeklyGainDisplay").innerText+"\n"; text += "Assumptions: Surplus based on 7700 kcal/kg, activity factor chosen by user, macros set from body weight."; if(navigator.clipboard && navigator.clipboard.writeText){ navigator.clipboard.writeText(text); } } window.onload=function(){ initChart(); resetForm(); };

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