MariposasCalorie Target Calculator
By Zachary, builder of Mariposas · Reviewed against published exercise-science sources (references)
· Last updated June 2026
Nutrition & Calories | Goal | Calories/day |
|---|---|
| Maintain | 2600 |
| Lose fat (−500) | 2100 |
| Gain muscle (+300) | 2900 |
Get your TDEE from the TDEE calculator first.
Turn your maintenance calories (TDEE) into clear daily targets for losing fat, maintaining, or gaining muscle. Pair it with the TDEE and macro calculators to build a simple plan.
⚕️ This calculator is a general-information estimate from standard formulas, not professional or medical advice. Individual results vary; don’t use it to make medical or dietary decisions.
How it works
A calorie target calculator takes your Total Daily Energy Expenditure (TDEE) as the starting point and applies a structured deficit or surplus to produce a daily calorie goal. The standard approach, backed by decades of metabolic research, anchors fat loss targets to roughly 3,500 calories per pound of body fat. A 500-calorie daily deficit, for example, works out to approximately one pound of fat per week on paper, though real results vary based on water retention, metabolic adaptation, and how precisely you track intake. For muscle gain, a modest surplus of 200 to 300 calories above TDEE is a common programming range because larger surpluses tend to accelerate fat accumulation without meaningfully speeding up muscle protein synthesis beyond a threshold. Maintenance simply mirrors your TDEE, giving you a daily number to hit when the goal is body composition stability rather than directional change.
When to use it
This calculator is most useful once you already have a reliable TDEE estimate, either from a TDEE calculator or from tracking your actual intake and weight over two to four weeks of stable bodyweight. The output helps you make a specific numerical decision: pick a calorie ceiling for a fat loss phase, set a floor to avoid unintentional weight loss during a strength block, or establish a controlled surplus for a dedicated muscle-building period. Athletes moving between training phases, and anyone who has plateaued and wants to audit their numbers, will get the most practical mileage from the result.
Worked example
Say your TDEE calculator outputs 2,800 calories per day based on your size, age, and activity level. You select a moderate fat loss goal, and the calculator applies a 500-calorie deficit, producing a daily target of 2,300 calories. That number is the ceiling you build your meals around, not a floor, and pairing it with a macro breakdown (say, 180 g protein, 230 g carbohydrate, 70 g fat) turns the raw calorie number into an actionable food plan. If after three weeks you're losing more than 1.5 pounds per week consistently, many coaches would nudge the target up by 100 to 150 calories to protect lean mass, which is exactly the kind of adjustment this calculator makes easy to recalculate on the fly.
Tips for an accurate result
- Feed the calculator your most accurate TDEE estimate possible. A number from a formula alone carries meaningful error; cross-checking it against two to three weeks of real intake data at stable weight will get you much closer to your true maintenance.
- Resist the urge to set an aggressive deficit because faster loss sounds appealing. Targets below roughly 1,200 calories for women and 1,500 for men tend to compress protein intake and accelerate muscle loss, which works against almost any physique goal.
- Treat the output as a weekly average rather than a daily ceiling you must hit exactly. One day at 2,500 and another at 2,100 averages to the same place as two days at 2,300, and that flexibility makes the plan sustainable across busy weeks.
- Recalculate every four to six weeks during a fat loss phase. As bodyweight drops, TDEE drops with it, so the deficit that produced results in week one quietly shrinks without an update to your target.
- Log food for at least a week before using this calculator so your sense of portion sizes is calibrated. The most common reason calorie targets fail is not the math; it's the gap between estimated and actual portion weights.
Formula & sources: methodology · references.
Now go hit the number Mariposas turns every workout, run and class into progress · collect a cute pet 🐾FAQ
- How is a calorie target different from my TDEE?
- TDEE is an estimate of what you burn in a day. A calorie target is what you choose to eat relative to that number. They are equal at maintenance, but a fat loss target sits below TDEE and a muscle gain target sits above it. TDEE is the input; calorie target is the decision you make with that input.
- What if my target feels too low to sustain?
- That usually means the TDEE estimate was off, or the deficit selected is larger than is practical for your lifestyle. A good first adjustment is tightening up food logging accuracy for a week, then recalculating. Many people discover their 'maintenance' was already a few hundred calories lower than expected, which makes a modest deficit feel drastic.
- Do calorie targets need to change on rest days versus training days?
- They can, but most general-purpose targets use a flat daily number averaged across the week for simplicity. Cycling calories (more on training days, fewer on rest days) is a legitimate strategy that some lifters prefer, but the weekly total is what drives the fat gain or fat loss outcome. This calculator produces the flat-daily version, which you can then redistribute across your week if you prefer the cycling approach.
- Why does the 3,500 calories per pound rule not always match my results?
- The 3,500-per-pound figure is a population average derived largely from the energy density of adipose tissue. Individual variation in metabolic adaptation, water fluctuations tied to glycogen and sodium, changes in NEAT (non-exercise activity thermogenesis), and logging inaccuracy all create gaps between predicted and actual weight change. The formula is a useful planning tool, not a precise promise.
- Can I use this calculator to plan a bulk without gaining too much fat?
- Yes, and that is one of its more practical applications. Setting a surplus of 200 to 300 calories over TDEE targets what is sometimes called a 'lean bulk,' where weight gain is slow enough (roughly 0.25 to 0.5 pounds per week for most people) that the majority of new tissue is lean mass rather than fat. Tracking bodyweight weekly and adjusting the target if gain accelerates beyond that window is how most experienced lifters manage the process.